diff --git a/includes/bp-groups/classes/class-bp-rest-group-membership-endpoint.php b/includes/bp-groups/classes/class-bp-rest-group-membership-endpoint.php
index 9092b28c..ecd2e86e 100644
--- a/includes/bp-groups/classes/class-bp-rest-group-membership-endpoint.php
+++ b/includes/bp-groups/classes/class-bp-rest-group-membership-endpoint.php
@@ -58,12 +58,6 @@ public function register_routes() {
 			$this->namespace,
 			'/' . $this->rest_base . '/(?P<group_id>[\d]+)/members',
 			array(
-				'args'   => array(
-					'group_id' => array(
-						'description' => __( 'A unique numeric ID for the Group.', 'buddypress' ),
-						'type'        => 'integer',
-					),
-				),
 				array(
 					'methods'             => WP_REST_Server::READABLE,
 					'callback'            => array( $this, 'get_items' ),
@@ -84,16 +78,6 @@ public function register_routes() {
 			$this->namespace,
 			'/' . $this->rest_base . '/(?P<group_id>[\d]+)/members/(?P<user_id>[\d]+)',
 			array(
-				'args'   => array(
-					'group_id' => array(
-						'description' => __( 'A unique numeric ID for the Group.', 'buddypress' ),
-						'type'        => 'integer',
-					),
-					'user_id'  => array(
-						'description' => __( 'A unique numeric ID for the Group Member.', 'buddypress' ),
-						'type'        => 'integer',
-					),
-				),
 				array(
 					'methods'             => WP_REST_Server::EDITABLE,
 					'callback'            => array( $this, 'update_item' ),
@@ -320,18 +304,14 @@ public function create_item_permissions_check( $request ) {
 		$retval = new WP_Error(
 			'bp_rest_authorization_required',
 			__( 'Sorry, you are not allowed to perform this action.', 'buddypress' ),
-			array(
-				'status' => rest_authorization_required_code(),
-			)
+			array( 'status' => rest_authorization_required_code() )
 		);
 
 		if ( ! is_user_logged_in() ) {
 			$retval = new WP_Error(
 				'bp_rest_authorization_required',
 				__( 'Sorry, you need to be logged in to join a group.', 'buddypress' ),
-				array(
-					'status' => rest_authorization_required_code(),
-				)
+				array( 'status' => rest_authorization_required_code() )
 			);
 		} else {
 			$user             = bp_rest_get_user( $request->get_param( 'user_id' ) );
@@ -341,9 +321,7 @@ public function create_item_permissions_check( $request ) {
 				$retval = new WP_Error(
 					'bp_rest_group_member_invalid_id',
 					__( 'Invalid group member ID.', 'buddypress' ),
-					array(
-						'status' => 404,
-					)
+					array( 'status' => 404 )
 				);
 			} else {
 				$group = $this->groups_endpoint->get_group_object( $request->get_param( 'group_id' ) );
@@ -352,9 +330,7 @@ public function create_item_permissions_check( $request ) {
 					$retval = new WP_Error(
 						'bp_rest_group_invalid_id',
 						__( 'Invalid group ID.', 'buddypress' ),
-						array(
-							'status' => 404,
-						)
+						array( 'status' => 404 )
 					);
 				} elseif ( bp_current_user_can( 'bp_moderate' ) || ( bp_current_user_can( 'groups_join_group', array( 'group_id' => $group->id ) ) && $loggedin_user_id === $user->ID ) ) {
 					$retval = true;
@@ -362,9 +338,7 @@ public function create_item_permissions_check( $request ) {
 					$retval = new WP_Error(
 						'bp_rest_group_member_failed_to_join',
 						__( 'Could not join the group.', 'buddypress' ),
-						array(
-							'status' => 500,
-						)
+						array( 'status' => 500 )
 					);
 				}
 			}
@@ -396,28 +370,35 @@ public function update_item( $request ) {
 		$role     = $request->get_param( 'role' );
 		$group_id = $group->id;
 
+		$bp_loggedin_user_id = bp_loggedin_user_id();
+
+		// Check if the user is a member of the group.
+		if ( 'unban' !== $action && ! groups_is_user_member( $user->ID, $group_id ) ) {
+			return new WP_Error(
+				'bp_rest_group_member_not_member',
+				__( 'Sorry, you are not allowed to perform this action.', 'buddypress' ),
+				array( 'status' => 500 )
+			);
+		}
+
 		if ( 'promote' === $action ) {
-			if ( ! groups_promote_member( $user->ID, $group_id, $role, bp_loggedin_user_id() ) ) {
+			if ( ! groups_promote_member( $user->ID, $group_id, $role, $bp_loggedin_user_id ) ) {
 				return new WP_Error(
 					'bp_rest_group_member_failed_to_promote',
 					__( 'Could not promote member.', 'buddypress' ),
-					array(
-						'status' => 500,
-					)
+					array( 'status' => 500 )
 				);
 			}
 		} elseif ( 'demote' === $action && 'member' !== $role ) {
-			if ( ! groups_promote_member( $user->ID, $group_id, $role, bp_loggedin_user_id() ) ) {
+			if ( ! groups_promote_member( $user->ID, $group_id, $role, $bp_loggedin_user_id ) ) {
 				return new WP_Error(
 					'bp_rest_group_member_failed_to_demote',
 					__( 'Could not demote member.', 'buddypress' ),
-					array(
-						'status' => 500,
-					)
+					array( 'status' => 500 )
 				);
 			}
 		} elseif ( in_array( $action, array( 'demote', 'ban', 'unban' ), true ) ) {
-			if ( ! call_user_func( 'groups_' . $action . '_member', $user->ID, $group_id, bp_loggedin_user_id() ) ) {
+			if ( ! call_user_func( 'groups_' . $action . '_member', $user->ID, $group_id, $bp_loggedin_user_id ) ) {
 				$messages = array(
 					'demote' => __( 'Could not demote member from the group.', 'buddypress' ),
 					'ban'    => __( 'Could not ban member from the group.', 'buddypress' ),
@@ -427,9 +408,7 @@ public function update_item( $request ) {
 				return new WP_Error(
 					'bp_rest_group_member_failed_to_' . $action,
 					$messages[ $action ],
-					array(
-						'status' => 500,
-					)
+					array( 'status' => 500 )
 				);
 			}
 		}
@@ -437,9 +416,6 @@ public function update_item( $request ) {
 		// Get updated group member.
 		$group_member = new BP_Groups_Member( $user->ID, $group_id );
 
-		// Setting context.
-		$request->set_param( 'context', 'edit' );
-
 		$retval = array(
 			$this->prepare_response_for_collection(
 				$this->prepare_item_for_response( $group_member, $request )
@@ -449,7 +425,7 @@ public function update_item( $request ) {
 		$response = rest_ensure_response( $retval );
 
 		/**
-		 * Fires after a group member is updated via the REST API.
+		 * Fires after a group member status is updated via the REST API.
 		 *
 		 * @since 0.1.0
 		 *
@@ -473,23 +449,23 @@ public function update_item( $request ) {
 	 * @return true|WP_Error
 	 */
 	public function update_item_permissions_check( $request ) {
-		$error  = new WP_Error(
+		$error = new WP_Error(
 			'bp_rest_authorization_required',
 			__( 'Sorry, you are not allowed to perform this action.', 'buddypress' ),
-			array(
-				'status' => rest_authorization_required_code(),
-			)
+			array( 'status' => rest_authorization_required_code() )
 		);
+
+		$admin_error = new WP_Error(
+			'bp_rest_authorization_required',
+			__( 'Group needs 1 admin at least. Please promote a user before trying to remove this group admin.', 'buddypress' ),
+			array( 'status' => rest_authorization_required_code() )
+		);
+
 		$retval = $error;
+		$action = $request->get_param( 'action' );
 
 		if ( ! is_user_logged_in() ) {
-			$retval = new WP_Error(
-				'bp_rest_authorization_required',
-				__( 'Sorry, you need to be logged in to make an update.', 'buddypress' ),
-				array(
-					'status' => rest_authorization_required_code(),
-				)
-			);
+			$retval = $error;
 		} else {
 			$user             = bp_rest_get_user( $request->get_param( 'user_id' ) );
 			$loggedin_user_id = bp_loggedin_user_id();
@@ -498,9 +474,7 @@ public function update_item_permissions_check( $request ) {
 				$retval = new WP_Error(
 					'bp_rest_group_member_invalid_id',
 					__( 'Invalid group member ID.', 'buddypress' ),
-					array(
-						'status' => 404,
-					)
+					array( 'status' => 404 )
 				);
 			} else {
 				$group = $this->groups_endpoint->get_group_object( $request->get_param( 'group_id' ) );
@@ -509,41 +483,35 @@ public function update_item_permissions_check( $request ) {
 					$retval = new WP_Error(
 						'bp_rest_group_invalid_id',
 						__( 'Invalid group ID.', 'buddypress' ),
-						array(
-							'status' => 404,
-						)
+						array( 'status' => 404 )
 					);
-				} elseif ( bp_current_user_can( 'bp_moderate' ) ) {
-					$retval = true;
-				} elseif ( in_array( $request->get_param( 'action' ), array( 'ban', 'unban', 'promote', 'demote' ), true ) ) {
-					if ( groups_is_user_admin( $loggedin_user_id, $group->id ) ) {
-						if ( $loggedin_user_id !== $user->ID ) {
+				} elseif ( bp_current_user_can( 'bp_moderate' ) && $loggedin_user_id !== $user->ID ) {
+					if ( 'demote' === $action && groups_is_user_admin( $user->ID, $group->id ) ) {
+						$group_admins = groups_get_group_admins( $group->id );
+
+						if ( 1 !== count( $group_admins ) ) {
 							$retval = true;
 						} else {
-							$group_admins = groups_get_group_admins( $group->id );
-
-							if ( 1 !== count( $group_admins ) ) {
-								$retval = true;
-							} else {
-								$retval = $error;
-							}
+							$retval = $admin_error;
 						}
 					} else {
-						$messages = array(
-							'ban'     => __( 'Sorry, you are not allowed to ban this group member.', 'buddypress' ),
-							'unban'   => __( 'Sorry, you are not allowed to unban this group member.', 'buddypress' ),
-							'promote' => __( 'Sorry, you are not allowed to promote this group member.', 'buddypress' ),
-							'demote'  => __( 'Sorry, you are not allowed to demote this group member.', 'buddypress' ),
-						);
-
-						$retval = new WP_Error(
-							'bp_rest_group_member_cannot_' . $request->get_param( 'action' ),
-							$messages[ $request->get_param( 'action' ) ],
-							array(
-								'status' => rest_authorization_required_code(),
-							)
-						);
+						$retval = true;
 					}
+				} elseif ( groups_is_user_admin( $loggedin_user_id, $group->id ) && $loggedin_user_id !== $user->ID ) {
+					$retval = true;
+				} else {
+					$messages = array(
+						'ban'     => __( 'Sorry, you are not allowed to ban this group member.', 'buddypress' ),
+						'unban'   => __( 'Sorry, you are not allowed to unban this group member.', 'buddypress' ),
+						'promote' => __( 'Sorry, you are not allowed to promote this group member.', 'buddypress' ),
+						'demote'  => __( 'Sorry, you are not allowed to demote this group member.', 'buddypress' ),
+					);
+
+					$retval = new WP_Error(
+						'bp_rest_group_member_cannot_' . $action,
+						$messages[ $action ],
+						array( 'status' => rest_authorization_required_code() )
+					);
 				}
 			}
 		}
@@ -568,34 +536,33 @@ public function update_item_permissions_check( $request ) {
 	 * @return WP_REST_Response|WP_Error
 	 */
 	public function delete_item( $request ) {
-		// Setting context.
-		$request->set_param( 'context', 'edit' );
+		$group_id = $request->get_param( 'group_id' );
+		$user_id  = $request->get_param( 'user_id' );
 
 		// Get the Group member before it's removed.
-		$member   = new BP_Groups_Member( $request->get_param( 'user_id' ), $request->get_param( 'group_id' ) );
-		$previous = $this->prepare_item_for_response( $member, $request );
+		$member = new BP_Groups_Member( $user_id, $group_id );
 
 		if ( ! $member->remove() ) {
 			return new WP_Error(
 				'bp_rest_group_member_failed_to_remove',
 				__( 'Could not remove member from this group.', 'buddypress' ),
-				array(
-					'status' => 500,
-				)
+				array( 'status' => 500 )
 			);
 		}
 
+		$previous_member = $this->prepare_item_for_response( $member, $request );
+
 		// Build the response.
 		$response = new WP_REST_Response();
 		$response->set_data(
 			array(
 				'removed'  => true,
-				'previous' => $previous->get_data(),
+				'previous' => $previous_member->get_data(),
 			)
 		);
 
-		$user  = bp_rest_get_user( $request->get_param( 'user_id' ) );
-		$group = $this->groups_endpoint->get_group_object( $request->get_param( 'group_id' ) );
+		$user  = bp_rest_get_user( $user_id );
+		$group = $this->groups_endpoint->get_group_object( $group_id );
 
 		/**
 		 * Fires after a group member is deleted via the REST API.
@@ -622,22 +589,27 @@ public function delete_item( $request ) {
 	 * @return true|WP_Error
 	 */
 	public function delete_item_permissions_check( $request ) {
-		$error  = new WP_Error(
+		$authorization_code = rest_authorization_required_code();
+
+		$error = new WP_Error(
 			'bp_rest_authorization_required',
 			__( 'Sorry, you are not allowed to perform this action.', 'buddypress' ),
-			array(
-				'status' => rest_authorization_required_code(),
-			)
+			array( 'status' => $authorization_code )
+		);
+
+		$admin_error = new WP_Error(
+			'bp_rest_authorization_required',
+			__( 'Group needs 1 admin at least. Please promote a user before trying to remove this group admin.', 'buddypress' ),
+			array( 'status' => $authorization_code )
 		);
+
 		$retval = $error;
 
 		if ( ! is_user_logged_in() ) {
 			$retval = new WP_Error(
 				'bp_rest_authorization_required',
 				__( 'Sorry, you need to be logged in to view a group membership.', 'buddypress' ),
-				array(
-					'status' => rest_authorization_required_code(),
-				)
+				array( 'status' => $authorization_code )
 			);
 		} else {
 			$user             = bp_rest_get_user( $request->get_param( 'user_id' ) );
@@ -647,9 +619,7 @@ public function delete_item_permissions_check( $request ) {
 				return new WP_Error(
 					'bp_rest_group_member_invalid_id',
 					__( 'Invalid group member ID.', 'buddypress' ),
-					array(
-						'status' => 404,
-					)
+					array( 'status' => 404 )
 				);
 			} else {
 				$group = $this->groups_endpoint->get_group_object( $request->get_param( 'group_id' ) );
@@ -658,21 +628,28 @@ public function delete_item_permissions_check( $request ) {
 					$retval = new WP_Error(
 						'bp_rest_group_invalid_id',
 						__( 'Invalid group ID.', 'buddypress' ),
-						array(
-							'status' => 404,
-						)
+						array( 'status' => 404 )
 					);
-				} elseif ( bp_current_user_can( 'bp_moderate' ) || ( $user->ID !== $loggedin_user_id && groups_is_user_admin( $loggedin_user_id, $group->id ) ) ) {
-					$retval = true;
+				} elseif ( bp_current_user_can( 'bp_moderate' ) || ( groups_is_user_admin( $loggedin_user_id, $group->id ) && $loggedin_user_id !== $user->ID ) ) {
+					if ( groups_is_user_admin( $user->ID, $group->id ) ) {
+						$group_admins = groups_get_group_admins( $group->id );
+
+						if ( 1 !== count( $group_admins ) ) {
+							$retval = true;
+						} else {
+							$retval = $admin_error;
+						}
+					} else {
+						$retval = true;
+					}
 				} elseif ( $user->ID === $loggedin_user_id && ! groups_is_user_banned( $user->ID, $group->id ) ) {
-					$group_admins = groups_get_group_admins( $group->id );
+					if ( groups_is_user_admin( $loggedin_user_id, $group->id ) ) {
+						$group_admins = groups_get_group_admins( $group->id );
 
-					// Special case for self-removal: don't allow if it'd leave a group with no admins.
-					if ( in_array( $loggedin_user_id, wp_list_pluck( $group_admins, 'user_id' ), true ) ) {
 						if ( 1 !== count( $group_admins ) ) {
 							$retval = true;
 						} else {
-							$retval = $error;
+							$retval = $admin_error;
 						}
 					} else {
 						$retval = true;
diff --git a/tests/testcases/membership/test-group-membership-controller.php b/tests/testcases/membership/test-group-membership-controller.php
index a80fe172..42d2f73c 100644
--- a/tests/testcases/membership/test-group-membership-controller.php
+++ b/tests/testcases/membership/test-group-membership-controller.php
@@ -68,29 +68,24 @@ public function test_get_items() {
 
 		$this->bp::set_current_user( $u1 );
 
-		$request = new WP_REST_Request( 'GET', $this->endpoint_url . $g1 . '/members' );
-
-		$request->set_param( 'context', 'view' );
+		$request  = new WP_REST_Request( 'GET', $this->endpoint_url . $g1 . '/members' );
 		$response = $this->server->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
 
+		$headers = $response->get_headers();
+		$this->assertEquals( 2, $headers['X-WP-Total'] );
+		$this->assertEquals( 1, $headers['X-WP-TotalPages'] );
+
 		$all_data = $response->get_data();
 		$this->assertNotEmpty( $all_data );
 
 		$u_ids = wp_list_pluck( $all_data, 'id' );
 
 		// Check results.
+		$this->assertCount( 2, $u_ids );
 		$this->assertEqualSets( [ $u1, $u2 ], $u_ids );
 		$this->assertNotContains( $u3, $u_ids );
-
-		// Verify user information.
-		foreach ( $all_data as $data ) {
-			$user = bp_rest_get_user( $data['id'] );
-			$member_object = new BP_Groups_Member( $user->ID, $g1 );
-
-			$this->check_user_data( $user, $data, $member_object );
-		}
 	}
 
 	/**
@@ -111,7 +106,8 @@ public function test_get_items_by_specific_group_role() {
 		// Promote $u2 to a moderator
 		add_filter( 'bp_is_item_admin', '__return_true' );
 
-		groups_promote_member( $u2, $g1, 'mod' );
+		$member_object = new BP_Groups_Member( $u2, $g1 );
+		$member_object->promote( 'mod' );
 
 		remove_filter( 'bp_is_item_admin', '__return_true' );
 
@@ -120,7 +116,6 @@ public function test_get_items_by_specific_group_role() {
 			'roles' => array( 'mod' ),
 		) );
 
-		$request->set_param( 'context', 'view' );
 		$response = $this->server->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
@@ -131,16 +126,9 @@ public function test_get_items_by_specific_group_role() {
 		$u_ids = wp_list_pluck( $all_data, 'id' );
 
 		// Check results.
+		$this->assertCount( 1, $u_ids );
 		$this->assertEqualSets( [ $u2 ], $u_ids );
 		$this->assertNotContains( $u1, $u_ids );
-
-		// Verify user information.
-		foreach ( $all_data as $data ) {
-			$user = bp_rest_get_user( $data['id'] );
-			$member_object = new BP_Groups_Member( $user->ID, $g1 );
-
-			$this->check_user_data( $user, $data, $member_object );
-		}
 	}
 
 	/**
@@ -159,7 +147,6 @@ public function test_get_items_with_support_for_the_community_visibility() {
 		$this->populate_group_with_members( [ $u1, $u2 ], $g1 );
 
 		$request = new WP_REST_Request( 'GET', $this->endpoint_url . $g1 . '/members' );
-		$request->set_param( 'context', 'view' );
 		$response = $this->server->dispatch( $request );
 
 		$this->assertErrorResponse( 'bp_rest_authorization_required', $response, rest_authorization_required_code() );
@@ -189,8 +176,6 @@ public function test_get_paginated_items() {
 			'page'     => 2,
 			'per_page' => 3,
 		) );
-
-		$request->set_param( 'context', 'view' );
 		$response = $this->server->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
@@ -202,13 +187,11 @@ public function test_get_paginated_items() {
 		$all_data = $response->get_data();
 		$this->assertNotEmpty( $all_data );
 
-		// Verify user information.
-		foreach ( $all_data as $data ) {
-			$user = bp_rest_get_user( $data['id'] );
-			$member_object = new BP_Groups_Member( $user->ID, $g1 );
+		$u_ids = wp_list_pluck( $all_data, 'id' );
 
-			$this->check_user_data( $user, $data, $member_object );
-		}
+		// Check results.
+		$this->assertCount( 3, $u_ids );
+		$this->assertEqualSets( [ $u4, $u5, $u6 ], $u_ids );
 	}
 
 	/**
@@ -217,13 +200,12 @@ public function test_get_paginated_items() {
 	public function test_get_items_no_search_terms() {
 		$u1 = static::factory()->user->create();
 		$u2 = static::factory()->user->create();
-
-		$g1 = $this->bp::factory()->group->create( array(
-			'status' => 'public',
-		) );
+		$g1 = $this->bp::factory()->group->create();
 
 		$this->populate_group_with_members( [ $u1, $u2 ], $g1 );
-		groups_promote_member( $u1, $g1, 'admin' );
+
+		$member_object = new BP_Groups_Member( $u1, $g1 );
+		$member_object->promote( 'admin' );
 
 		$this->bp::set_current_user( $u1 );
 
@@ -231,8 +213,7 @@ public function test_get_items_no_search_terms() {
 
 		$request = new WP_REST_Request( 'GET', $this->endpoint_url . $g1 . '/members' );
 
-		$request->set_param( 'context', 'view' );
-		$response = $this->server->dispatch( $request );
+		$this->server->dispatch( $request );
 
 		remove_filter( 'bp_rest_group_members_get_items_query_args', array( $this, 'group_members_query_args' ) );
 
@@ -251,20 +232,18 @@ public function test_get_items_has_search_terms() {
 			'user_nicename' => 'foo bar',
 		) );
 
-		$g1 = $this->bp::factory()->group->create( array(
-			'status' => 'public',
-		) );
+		$g1 = $this->bp::factory()->group->create();
 
 		$this->populate_group_with_members( [ $u1, $u2 ], $g1 );
-		groups_promote_member( $u1, $g1, 'admin' );
+
+		$member_object = new BP_Groups_Member( $u1, $g1 );
+		$member_object->promote( 'admin' );
 
 		$this->bp::set_current_user( $u1 );
 
 		add_filter( 'bp_rest_group_members_get_items_query_args', array( $this, 'group_members_query_args' ) );
 
 		$request = new WP_REST_Request( 'GET', $this->endpoint_url . $g1 . '/members' );
-
-		$request->set_param( 'context', 'view' );
 		$request->set_param( 'search', 'bar' );
 		$response = $this->server->dispatch( $request );
 
@@ -275,7 +254,7 @@ public function test_get_items_has_search_terms() {
 		$all_data = $response->get_data();
 		$results = wp_list_pluck( $all_data, 'id' );
 
-		$this->assertTrue( 1 === count( $results ) );
+		$this->assertCount( 1, $results );
 		$this->assertSame( $u2, $results[0] );
 	}
 
@@ -292,23 +271,20 @@ public function group_members_query_args( $args ) {
 	 * @group get_item
 	 */
 	public function test_get_item() {
-		$this->markTestSkipped();
+		$this->markTestSkipped( 'This endpoint does not have a get_item meethod.' );
 	}
 
 	/**
 	 * @group create_item
 	 */
 	public function test_create_item() {
-		$u = static::factory()->user->create( array( 'role' => 'subscriber' ) );
+		$u = static::factory()->user->create();
 		$g = $this->bp::factory()->group->create();
 
 		$this->bp::set_current_user( $u );
 
 		$request = new WP_REST_Request( 'POST', $this->endpoint_url . $g . '/members' );
-		$request->set_param( 'context', 'view' );
-		$request->set_query_params( array(
-			'user_id' => $u,
-		) );
+		$request->set_query_params( array( 'user_id' => $u ) );
 		$response = $this->server->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
@@ -337,32 +313,28 @@ public function test_create_item_as_admin() {
 		$this->assertEquals( 200, $response->get_status() );
 
 		$all_data = $response->get_data();
-		$this->assertNotEmpty( $all_data );
+		$data     = reset( $all_data );
 
-		foreach ( $all_data as $data ) {
-			$user          = bp_rest_get_user( $data['id'] );
-			$member_object = new BP_Groups_Member( $user->ID, $this->group_id );
+		$user          = bp_rest_get_user( $data['id'] );
+		$member_object = new BP_Groups_Member( $user->ID, $this->group_id );
 
-			$this->check_user_data( $user, $data, $member_object, 'edit' );
-		}
+		$this->check_user_data( $user, $data, $member_object, 'edit' );
 	}
 
 	/**
 	 * @group create_item
 	 */
 	public function test_member_can_add_himself_to_public_group() {
-		$u = static::factory()->user->create( array( 'role' => 'subscriber' ) );
+		$u = static::factory()->user->create();
 
 		$this->bp::set_current_user( $u );
 
 		$request = new WP_REST_Request( 'POST', $this->endpoint_url . $this->group_id . '/members' );
 
 		// This usually would be 'edit', but we are testing a public group.
-		$request->set_param( 'context', 'view' );
 
-		$request->set_query_params( array(
-			'user_id' => $u,
-		) );
+		$request->set_query_params( array( 'user_id' => $u ) );
+
 		$response = $this->server->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
@@ -382,7 +354,7 @@ public function test_member_can_add_himself_to_public_group() {
 	 * @group create_item
 	 */
 	public function test_member_can_not_add_himself_to_private_group() {
-		$u = static::factory()->user->create( array( 'role' => 'subscriber' ) );
+		$u = static::factory()->user->create();
 
 		$g1 = $this->bp::factory()->group->create( array(
 			'status' => 'private',
@@ -391,10 +363,7 @@ public function test_member_can_not_add_himself_to_private_group() {
 		$this->bp::set_current_user( $u );
 
 		$request = new WP_REST_Request( 'POST', $this->endpoint_url . $g1 . '/members' );
-		$request->set_param( 'context', 'view' );
-		$request->set_query_params( array(
-			'user_id' => $u,
-		) );
+		$request->set_query_params( array( 'user_id' => $u ) );
 		$response = $this->server->dispatch( $request );
 
 		$this->assertErrorResponse( 'bp_rest_group_member_failed_to_join', $response, 500 );
@@ -404,7 +373,7 @@ public function test_member_can_not_add_himself_to_private_group() {
 	 * @group create_item
 	 */
 	public function test_member_can_not_add_himself_to_hidden_group() {
-		$u = static::factory()->user->create( array( 'role' => 'subscriber' ) );
+		$u = static::factory()->user->create();
 
 		$g1 = $this->bp::factory()->group->create( array(
 			'status' => 'hidden',
@@ -426,13 +395,12 @@ public function test_member_can_not_add_himself_to_hidden_group() {
 	 * @group create_item
 	 */
 	public function test_member_cannot_add_others_to_public_group() {
-		$u1 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
-		$u2 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
 
 		$this->bp::set_current_user( $u1 );
 
 		$request = new WP_REST_Request( 'POST', $this->endpoint_url . $this->group_id . '/members' );
-		$request->set_param( 'context', 'view' );
 		$request->set_query_params( array(
 			'user_id' => $u2,
 		) );
@@ -442,361 +410,761 @@ public function test_member_cannot_add_others_to_public_group() {
 	}
 
 	/**
+	 * Site admin can ban member.
+	 *
 	 * @group update_item
+	 * @group ban_member
 	 */
 	public function test_update_item() {
-		$u = static::factory()->user->create( array( 'role' => 'subscriber' ) );
+		$u = static::factory()->user->create();
 
 		$this->populate_group_with_members( [ $u ], $this->group_id );
 
 		$this->bp::set_current_user( $this->user );
 
 		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $this->group_id . '/members/' . $u  );
-		$request->set_query_params( array(
-			'action' => 'ban',
-		) );
-
-		$request->set_param( 'context', 'view' );
+		$request->set_query_params( array( 'action' => 'ban' ) );
 		$response = $this->server->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
 
 		$all_data = $response->get_data();
-		$this->assertNotEmpty( $all_data );
+		$data     = reset( $all_data );
 
-		foreach ( $all_data as $data ) {
-			$user          = bp_rest_get_user( $data['id'] );
-			$member_object = new BP_Groups_Member( $user->ID, $this->group_id );
+		$user          = bp_rest_get_user( $data['id'] );
+		$member_object = new BP_Groups_Member( $u, $this->group_id );
 
-			$this->check_user_data( $user, $data, $member_object, 'edit' );
-		}
+		$this->assertTrue( $u === $user->ID );
+		$this->assertTrue( (bool) $member_object->is_banned );
 	}
 
 	/**
 	 * @group update_item
+	 * @group ban_member
 	 */
-	public function test_administrator_can_ban_member() {
-		$u = static::factory()->user->create( array( 'role' => 'subscriber' ) );
-
-		$this->populate_group_with_members( [ $u ], $this->group_id );
-
-		$this->bp::set_current_user( $this->user );
+	public function test_group_mod_can_not_ban_member() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
 
-		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $this->group_id . '/members/' . $u );
-		$request->set_query_params( array(
-			'action' => 'ban',
-		) );
+		$g1 = $this->bp::factory()->group->create( array( 'creator_id' => $u2 ) );
 
-		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		$this->populate_group_with_members( [ $u1, $u3 ], $g1 );
 
-		$this->assertEquals( 200, $response->get_status() );
+		// Promote $u2 to a group mod.
+		$member_object = new BP_Groups_Member( $u1, $g1 );
+		$member_object->promote( 'mod' );
 
-		$all_data = $response->get_data();
-		$this->assertNotEmpty( $all_data );
+		$this->bp::set_current_user( $u1 );
 
-		foreach ( $all_data as $data ) {
-			$user          = bp_rest_get_user( $data['id'] );
-			$member_object = new BP_Groups_Member( $user->ID, $this->group_id );
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u3 );
+		$request->set_query_params( array( 'action' => 'ban' ) );
+		$response = $this->server->dispatch( $request );
 
-			$this->assertTrue( (bool) $member_object->is_banned );
-			$this->check_user_data( $user, $data, $member_object, 'edit' );
-		}
+		$this->assertErrorResponse( 'bp_rest_group_member_cannot_ban', $response, rest_authorization_required_code() );
 	}
 
 	/**
 	 * @group update_item
+	 * @group ban_member
 	 */
-	public function test_group_admin_can_ban_member() {
-		$u1 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
-		$u2 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
+	public function test_group_mod_can_not_ban_random_member() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
+		$u4 = static::factory()->user->create();
 
-		$g1 = $this->bp::factory()->group->create( array(
-			'creator_id' => $u2,
-		) );
+		$g1 = $this->bp::factory()->group->create( array( 'creator_id' => $u2 ) );
 
-		$this->populate_group_with_members( [ $u1 ], $g1 );
+		$this->populate_group_with_members( [ $u1, $u3 ], $g1 );
 
-		$this->bp::set_current_user( $u2 );
+		// Promote $u2 to a group mod.
+		$member_object = new BP_Groups_Member( $u1, $g1 );
+		$member_object->promote( 'mod' );
 
-		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u1 );
-		$request->set_query_params( array(
-			'action' => 'ban',
-		) );
+		$this->bp::set_current_user( $u1 );
 
-		$request->set_param( 'context', 'edit' );
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u4 );
+		$request->set_query_params( array( 'action' => 'ban' ) );
 		$response = $this->server->dispatch( $request );
 
-		$this->assertEquals( 200, $response->get_status() );
-
-		$all_data = $response->get_data();
-		$this->assertNotEmpty( $all_data );
-
-		foreach ( $all_data as $data ) {
-			$user          = bp_rest_get_user( $data['id'] );
-			$member_object = new BP_Groups_Member( $user->ID, $this->group_id );
-
-			$this->assertTrue( $u1 === $user->ID );
-			$this->assertTrue( empty( $member_object->is_banned ) );
-		}
+		$this->assertErrorResponse( 'bp_rest_group_member_cannot_ban', $response, rest_authorization_required_code() );
 	}
 
 	/**
 	 * @group update_item
+	 * @group ban_member
 	 */
-	public function test_administrator_can_promote_member() {
-		$u = static::factory()->user->create( array( 'role' => 'subscriber' ) );
+	public function test_group_admin_can_ban_member() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
 
-		$this->populate_group_with_members( [ $u ], $this->group_id );
+		$g1 = $this->bp::factory()->group->create( array( 'creator_id' => $u2 ) );
 
-		$this->bp::set_current_user( $this->user );
+		$this->populate_group_with_members( [ $u1, $u3 ], $g1 );
 
-		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $this->group_id . '/members/' . $u );
-		$request->set_query_params( array(
-			'action'   => 'promote',
-			'role'     => 'mod',
-		) );
+		// Promote $u2 to a group admin.
+		$member_object = new BP_Groups_Member( $u2, $g1 );
+		$member_object->promote( 'admin' );
 
-		$request->set_param( 'context', 'edit' );
+		$this->bp::set_current_user( $u2 );
+
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u1 );
+		$request->set_query_params( array( 'action' => 'ban' ) );
 		$response = $this->server->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
 
 		$all_data = $response->get_data();
-		$this->assertNotEmpty( $all_data );
+		$data     = reset( $all_data );
 
-		foreach ( $all_data as $data ) {
-			$user          = bp_rest_get_user( $data['id'] );
-			$member_object = new BP_Groups_Member( $user->ID, $this->group_id );
+		$user          = bp_rest_get_user( $data['id'] );
+		$member_object = new BP_Groups_Member( $user->ID, $g1 );
 
-			$this->check_user_data( $user, $data, $member_object, 'edit' );
-		}
+		$this->assertTrue( $u1 === $user->ID );
+		$this->assertTrue( (bool) $member_object->is_banned );
 	}
 
 	/**
 	 * @group update_item
+	 * @group ban_member
 	 */
-	public function test_group_admin_can_promote_member() {
+	public function test_group_admin_can_not_ban_random_member() {
 		$u1 = static::factory()->user->create();
 		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
+		$u4 = static::factory()->user->create();
 
-		$g1 = $this->bp::factory()->group->create( array(
-			'creator_id' => $u2,
-		) );
+		$g1 = $this->bp::factory()->group->create( array( 'creator_id' => $u2 ) );
 
-		$this->populate_group_with_members( [ $u1 ], $this->group_id );
+		$this->populate_group_with_members( [ $u1, $u3 ], $g1 );
 
 		$this->bp::set_current_user( $u2 );
 
-		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u1 );
-		$request->set_query_params( array(
-			'action' => 'promote',
-			'role'   => 'mod',
-		) );
-
-		$request->set_param( 'context', 'edit' );
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u4 );
+		$request->set_query_params( array( 'action' => 'ban' ) );
 		$response = $this->server->dispatch( $request );
 
-		$this->assertEquals( 200, $response->get_status() );
-
-		$all_data = $response->get_data();
-		$this->assertNotEmpty( $all_data );
-
-		foreach ( $all_data as $data ) {
-			$user          = bp_rest_get_user( $data['id'] );
-			$member_object = new BP_Groups_Member( $user->ID, $g1 );
-
-			$this->check_user_data( $user, $data, $member_object, 'edit' );
-		}
+		$this->assertErrorResponse( 'bp_rest_group_member_not_member', $response, 500 );
 	}
 
 	/**
 	 * @group update_item
 	 */
-	public function test_member_can_not_promote_other_member() {
-		$u1 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
-		$u2 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
-		$u3 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
+	public function test_site_admin_can_unban_member_from_group() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
 
-		$g1 = $this->bp::factory()->group->create( array(
-			'creator_id' => $u2,
-		) );
+		$g1 = $this->bp::factory()->group->create( array( 'creator_id' => $u2 ) );
 
 		$this->populate_group_with_members( [ $u1, $u3 ], $g1 );
 
-		$this->bp::set_current_user( $u3 );
-
-		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u1 );
-		$request->set_query_params( array(
-			'action' => 'promote',
-			'role'   => 'mod',
-		) );
-
-		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		// Ban $u1.
+		$member_object = new BP_Groups_Member( $u1, $g1 );
+		$member_object->ban();
 
-		$this->assertErrorResponse( 'bp_rest_group_member_cannot_promote', $response, 403 );
-	}
+		$this->assertTrue( (bool) $member_object->is_banned );
 
-	/**
-	 * @group update_item
-	 */
-	public function test_group_mods_can_not_promote_members() {
-		$u1 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
-		$u2 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
+		$this->bp::set_current_user( $this->user );
 
-		$g1 = $this->bp::factory()->group->create( array(
-			'creator_id' => $u1,
-		) );
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u1 );
+		$request->set_query_params( array( 'action' => 'unban' ) );
+		$response = $this->server->dispatch( $request );
 
-		$this->bp::add_user_to_group( $u2, $g1, array(
-			'is_mod' => true,
-		) );
+		$this->assertEquals( 200, $response->get_status() );
 
-		$this->bp::set_current_user( $u2 );
+		$all_data = $response->get_data();
+		$data     = reset( $all_data );
 
-		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u1 );
-		$request->set_query_params( array(
-			'action' => 'promote',
-			'role'   => 'mod',
-		) );
-		$response = $this->server->dispatch( $request );
+		$user          = bp_rest_get_user( $data['id'] );
+		$member_object = new BP_Groups_Member( $user->ID, $g1 );
 
-		$this->assertErrorResponse( 'bp_rest_group_member_cannot_promote', $response, 403 );
+		$this->assertTrue( $u1 === $user->ID );
+		$this->assertFalse( (bool) $member_object->is_banned );
 	}
 
 	/**
 	 * @group update_item
 	 */
-	public function test_admin_can_demote_group_admin_to_member() {
-		$u1 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
-		$u2 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
-		$u3 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
+	public function test_site_admin_can_not_unban_random_member() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
+		$u4 = static::factory()->user->create();
 
-		$g1 = $this->bp::factory()->group->create( array(
-			'creator_id' => $u2,
-		) );
+		$g1 = $this->bp::factory()->group->create( array( 'creator_id' => $u2 ) );
 
 		$this->populate_group_with_members( [ $u1, $u3 ], $g1 );
 
 		$this->bp::set_current_user( $this->user );
 
-		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u2 );
-		$request->set_query_params( array(
-			'action' => 'demote',
-		) );
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u4 );
+		$request->set_query_params( array( 'action' => 'unban' ) );
 		$response = $this->server->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
 
 		$all_data = $response->get_data();
-		$this->assertNotEmpty( $all_data );
+		$data     = reset( $all_data );
 
-		$data          = $all_data[0];
 		$user          = bp_rest_get_user( $data['id'] );
 		$member_object = new BP_Groups_Member( $user->ID, $g1 );
 
-		$this->assertTrue( $u2 === $user->ID );
-		$this->assertFalse( (bool) $member_object->is_mod );
-		$this->assertFalse( (bool) $member_object->is_admin );
-		$this->assertTrue( (bool) $member_object::check_is_member( $u2, $g1 ) );
-		$this->check_user_data( $user, $data, $member_object, 'edit' );
+		$this->assertFalse( groups_is_user_member( $user->ID, $g1 ) );
+		$this->assertTrue( $u4 === $user->ID );
+		$this->assertFalse( (bool) $member_object->is_banned );
 	}
 
 	/**
 	 * @group update_item
 	 */
-	public function test_group_admin_can_demote_another_group_admin_to_mod() {
-		$u1 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
-		$u2 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
-		$u3 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
+	public function test_group_admin_can_unban_member() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
 
-		$g1 = $this->bp::factory()->group->create( array(
-			'creator_id' => $u3,
-		) );
+		$g1 = $this->bp::factory()->group->create( array( 'creator_id' => $u2 ) );
 
-		$this->populate_group_with_members( [ $u1, $u2 ], $g1 );
+		$this->populate_group_with_members( [ $u1, $u3 ], $g1 );
 
-		$group_member_1 = new BP_Groups_Member( $u1, $g1 );
-		$group_member_1->promote( 'admin' );
+		// Promote $u2 to a group admin.
+		$member_object = new BP_Groups_Member( $u2, $g1 );
+		$member_object->promote( 'admin' );
 
-		$group_member_2 = new BP_Groups_Member( $u2, $g1 );
-		$group_member_2->promote( 'admin' );
+		// Ban $u1.
+		$member_object = new BP_Groups_Member( $u1, $g1 );
+		$member_object->ban();
 
-		$this->bp::set_current_user( $u1 );
+		$this->assertTrue( (bool) $member_object->is_banned );
 
-		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u2 );
-		$request->set_query_params( array(
-			'action' => 'demote',
-			'role'   => 'mod',
-		) );
+		$this->bp::set_current_user( $u2 );
 
-		$request->set_param( 'context', 'edit' );
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u1 );
+		$request->set_query_params( array( 'action' => 'unban' ) );
 		$response = $this->server->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
 
 		$all_data = $response->get_data();
-		$this->assertNotEmpty( $all_data );
+		$data     = reset( $all_data );
 
-		foreach ( $all_data as $data ) {
-			$user          = bp_rest_get_user( $data['id'] );
-			$member_object = new BP_Groups_Member( $user->ID, $g1 );
+		$user          = bp_rest_get_user( $data['id'] );
+		$member_object = new BP_Groups_Member( $user->ID, $g1 );
 
-			$this->assertTrue( $u2 === $user->ID );
-			$this->assertTrue( (bool) $member_object->is_mod );
-			$this->check_user_data( $user, $data, $member_object, 'edit' );
-		}
+		$this->assertTrue( $u1 === $user->ID );
+		$this->assertFalse( (bool) $member_object->is_banned );
 	}
 
 	/**
 	 * @group update_item
 	 */
-	public function test_member_can_not_demote_other_member() {
-		$u1 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
-		$u2 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
-		$u3 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
+	public function test_group_mod_can_not_unban_member() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
 
-		$g1 = $this->bp::factory()->group->create( array(
-			'creator_id' => $u2,
-		) );
+		$g1 = $this->bp::factory()->group->create( array( 'creator_id' => $u2 ) );
 
 		$this->populate_group_with_members( [ $u1, $u3 ], $g1 );
 
-		$this->bp::set_current_user( $u3 );
+		// Promote $u2 to a group mod.
+		$member_object = new BP_Groups_Member( $u2, $g1 );
+		$member_object->promote( 'mod' );
 
-		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u2 );
-		$request->set_query_params( array(
-			'action' => 'demote',
-		) );
+		// Ban $u1.
+		$member_object = new BP_Groups_Member( $u1, $g1 );
+		$member_object->ban();
 
-		$request->set_param( 'context', 'edit' );
+		$this->assertTrue( (bool) $member_object->is_banned );
+
+		$this->bp::set_current_user( $u2 );
+
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u1 );
+		$request->set_query_params( array( 'action' => 'unban' ) );
 		$response = $this->server->dispatch( $request );
 
-		$this->assertErrorResponse( 'bp_rest_group_member_cannot_demote', $response, 403 );
+		$this->assertErrorResponse( 'bp_rest_group_member_cannot_unban', $response, rest_authorization_required_code() );
 	}
 
 	/**
 	 * @group update_item
+	 * @group promote_member
 	 */
-	public function test_update_item_invalid_group_id() {
-		$u = static::factory()->user->create( array( 'role' => 'subscriber' ) );
+	public function test_site_admin_can_promote_member_to_mod() {
+		$u = static::factory()->user->create();
+
+		$this->populate_group_with_members( [ $u ], $this->group_id );
 
 		$this->bp::set_current_user( $this->user );
 
-		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . REST_TESTS_IMPOSSIBLY_HIGH_NUMBER . '/members/' . $u );
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $this->group_id . '/members/' . $u );
 		$request->set_query_params( array(
 			'action' => 'promote',
 			'role'   => 'mod',
 		) );
-
-		$request->set_param( 'context', 'edit' );
 		$response = $this->server->dispatch( $request );
 
-		$this->assertErrorResponse( 'bp_rest_group_invalid_id', $response, 404 );
-	}
+		$this->assertEquals( 200, $response->get_status() );
 
-	/**
+		$all_data = $response->get_data();
+		$data     = reset( $all_data );
+
+		$user          = bp_rest_get_user( $data['id'] );
+		$member_object = new BP_Groups_Member( $user->ID, $this->group_id );
+
+		$this->assertTrue( $u === $user->ID );
+		$this->assertTrue( (bool) $member_object->is_mod );
+	}
+
+	/**
+	 * @group update_item
+	 * @group promote_member
+	 */
+	public function test_group_admin_can_promote_member() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+
+		$g1 = $this->bp::factory()->group->create( array( 'creator_id' => $u2 ) );
+
+		$this->populate_group_with_members( [ $u1 ], $g1 );
+
+		$this->bp::set_current_user( $u2 );
+
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u1 );
+		$request->set_query_params( array(
+			'action' => 'promote',
+			'role'   => 'mod',
+		) );
+		$response = $this->server->dispatch( $request );
+
+		$this->assertEquals( 200, $response->get_status() );
+
+		$all_data = $response->get_data();
+		$data     = reset( $all_data );
+
+		$user          = bp_rest_get_user( $data['id'] );
+		$member_object = new BP_Groups_Member( $user->ID, $g1 );
+
+		$this->assertTrue( $u1 === $user->ID );
+		$this->assertTrue( (bool) $member_object->is_mod );
+	}
+
+	/**
+	 * @group update_item
+	 * @group promote_member
+	 */
+	public function test_member_can_not_promote_other_member() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
+
+		$g1 = $this->bp::factory()->group->create( array( 'creator_id' => $u2 ) );
+
+		$this->populate_group_with_members( [ $u1, $u3 ], $g1 );
+
+		$this->bp::set_current_user( $u3 );
+
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u1 );
+		$request->set_query_params( array(
+			'action' => 'promote',
+			'role'   => 'mod',
+		) );
+		$response = $this->server->dispatch( $request );
+
+		$this->assertErrorResponse( 'bp_rest_group_member_cannot_promote', $response, rest_authorization_required_code() );
+	}
+
+	/**
+	 * @group update_item
+	 * @group promote_member
+	 */
+	public function test_group_mods_can_not_promote_members() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+
+		$g1 = $this->bp::factory()->group->create( array( 'creator_id' => $u1 ) );
+
+		// Promote $u2 to a mod.
+		$this->bp::add_user_to_group( $u2, $g1, array( 'is_mod' => true ) );
+
+		$this->bp::set_current_user( $u2 );
+
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u1 );
+		$request->set_query_params( array(
+			'action' => 'promote',
+			'role'   => 'mod',
+		) );
+		$response = $this->server->dispatch( $request );
+
+		$this->assertErrorResponse( 'bp_rest_group_member_cannot_promote', $response, rest_authorization_required_code() );
+	}
+
+	/**
+	 * @group update_item
+	 * @group promote_member
+	 */
+	public function test_group_mod_can_not_promote_himself() {
+		$u1 = static::factory()->user->create();
+		$g1 = $this->bp::factory()->group->create( array( 'creator_id' => $u1 ) );
+
+		// Promote $u1 to a mod.
+		$this->bp::add_user_to_group( $u1, $g1, array( 'is_mod' => true ) );
+
+		$this->bp::set_current_user( $u1 );
+
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u1 );
+		$request->set_query_params( array(
+			'action' => 'promote',
+			'role'   => 'admin',
+		) );
+		$response = $this->server->dispatch( $request );
+
+		$this->assertErrorResponse( 'bp_rest_group_member_cannot_promote', $response, rest_authorization_required_code() );
+	}
+
+	/**
+	 * @group update_item
+	 * @group demote_member
+	 */
+	public function test_site_admin_can_demote_group_admin_to_member() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
+
+		$g1 = $this->bp::factory()->group->create( array( 'creator_id' => $u2 ) );
+
+		$this->populate_group_with_members( [ $u1, $u3 ], $g1 );
+
+		// Promote $u3 to an admin.
+		$member_object = new BP_Groups_Member( $u3, $g1 );
+		$member_object->promote( 'admin' );
+
+		$this->assertTrue( (bool) $member_object->is_admin );
+
+		// Site admin.
+		$this->bp::set_current_user( $this->user );
+
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u2 );
+		$request->set_query_params( array( 'action' => 'demote' ) );
+		$response = $this->server->dispatch( $request );
+
+		$this->assertEquals( 200, $response->get_status() );
+
+		$all_data      = $response->get_data();
+		$data          = $all_data[0];
+		$user          = bp_rest_get_user( $data['id'] );
+		$member_object = new BP_Groups_Member( $user->ID, $g1 );
+
+		$this->assertTrue( $u2 === $user->ID );
+		$this->assertFalse( (bool) $member_object->is_mod );
+		$this->assertFalse( (bool) $member_object->is_admin );
+		$this->assertTrue( (bool) groups_is_user_member( $u2, $g1 ) );
+	}
+
+	/**
+	 * @group update_item
+	 * @group demote_member
+	 */
+	public function test_site_admin_can_not_demote_the_only_group_admin() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
+
+		$g1 = $this->bp::factory()->group->create( array( 'creator_id' => $u2 ) );
+
+		$this->populate_group_with_members( [ $u1, $u3 ], $g1 );
+
+		// Site admin.
+		$this->bp::set_current_user( $this->user );
+
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u2 );
+		$request->set_query_params( array( 'action' => 'demote' ) );
+		$response = $this->server->dispatch( $request );
+
+		$this->assertErrorResponse( 'bp_rest_authorization_required', $response, rest_authorization_required_code() );
+	}
+
+	/**
+	 * @group update_item
+	 * @group demote_member
+	 */
+	public function test_site_admin_can_not_demote_himself() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
+
+		$g1 = $this->bp::factory()->group->create( array( 'creator_id' => $u2 ) );
+
+		$this->populate_group_with_members( [ $u1, $u3 ], $g1 );
+
+		// Site admin.
+		$this->bp::set_current_user( $this->user );
+
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $this->user );
+		$request->set_query_params( array( 'action' => 'demote' ) );
+		$response = $this->server->dispatch( $request );
+
+		$this->assertErrorResponse( 'bp_rest_group_member_cannot_demote', $response, rest_authorization_required_code() );
+	}
+
+	/**
+	 * @group update_item
+	 * @group demote_member
+	 */
+	public function test_site_admin_can_demote_group_admins() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
+
+		$g1 = $this->bp::factory()->group->create( array( 'creator_id' => $u2 ) );
+
+		$this->populate_group_with_members( [ $u1, $u3 ], $g1 );
+
+		// Promote $u2 to an admin.
+		$member_object = new BP_Groups_Member( $u2, $g1 );
+		$member_object->promote( 'admin' );
+
+		// Promote $u3 to an admin.
+		$member_object = new BP_Groups_Member( $u3, $g1 );
+		$member_object->promote( 'admin' );
+
+		$this->assertTrue( (bool) $member_object->is_admin );
+
+		// Site admin.
+		$this->bp::set_current_user( $this->user );
+
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u2 );
+		$request->set_query_params( array( 'action' => 'demote' ) );
+		$response = $this->server->dispatch( $request );
+
+		$this->assertEquals( 200, $response->get_status() );
+
+		$data = $response->get_data();
+		$user = bp_rest_get_user( $data[0]['id'] );
+
+		$member_object = new BP_Groups_Member( $user->ID, $g1 );
+
+		$this->assertTrue( $u2 === $user->ID );
+		$this->assertFalse( (bool) $member_object->is_mod );
+		$this->assertFalse( (bool) $member_object->is_admin );
+		$this->assertTrue( (bool) groups_is_user_member( $u2, $g1 ) );
+	}
+
+	/**
+	 * @group update_item
+	 * @group demote_member
+	 */
+	public function test_site_admin_can_demote_group_mods() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
+
+		$g1 = $this->bp::factory()->group->create( array( 'creator_id' => $u3 ) );
+
+		$this->populate_group_with_members( [ $u1, $u2, $u3 ], $g1 );
+
+		// Promote $u2 to an admin.
+		$member_object = new BP_Groups_Member( $u2, $g1 );
+		$member_object->promote( 'mod' );
+
+		$this->assertTrue( (bool) $member_object->is_mod );
+
+		// Site admin.
+		$this->bp::set_current_user( $this->user );
+
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u2 );
+		$request->set_query_params( array( 'action' => 'demote' ) );
+		$response = $this->server->dispatch( $request );
+
+		$this->assertEquals( 200, $response->get_status() );
+
+		$data = $response->get_data();
+		$user = bp_rest_get_user( $data[0]['id'] );
+
+		$member_object = new BP_Groups_Member( $user->ID, $g1 );
+
+		$this->assertTrue( $u2 === $user->ID );
+		$this->assertFalse( (bool) $member_object->is_mod );
+		$this->assertFalse( (bool) $member_object->is_admin );
+		$this->assertTrue( (bool) groups_is_user_member( $u2, $g1 ) );
+	}
+
+	/**
+	 * @group update_item
+	 * @group demote_member
+	 */
+	public function test_site_admin_can_not_demote_already_group_members() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
+
+		$g1 = $this->bp::factory()->group->create( array( 'creator_id' => $u3 ) );
+
+		$this->populate_group_with_members( [ $u1, $u2, $u3 ], $g1 );
+
+		// Promote $u2 to an admin.
+		$member_object = new BP_Groups_Member( $u2, $g1 );
+		$member_object->promote( 'mod' );
+
+		$this->assertTrue( (bool) $member_object->is_mod );
+
+		// Site admin.
+		$this->bp::set_current_user( $this->user );
+
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u1 );
+		$request->set_query_params( array( 'action' => 'demote' ) );
+		$response = $this->server->dispatch( $request );
+
+		$this->assertErrorResponse( 'bp_rest_group_member_failed_to_demote', $response, 500 );
+	}
+
+	/**
+	 * @group update_item
+	 * @group demote_member
+	 */
+	public function test_group_admin_can_demote_another_group_admin_to_mod() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
+
+		$g1 = $this->bp::factory()->group->create( array( 'creator_id' => $u3 ) );
+
+		$this->populate_group_with_members( [ $u1, $u2 ], $g1 );
+
+		$group_member = new BP_Groups_Member( $u2, $g1 );
+		$group_member->promote( 'admin' );
+
+		$this->bp::set_current_user( $u3 );
+
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u2 );
+		$request->set_query_params( array(
+			'action' => 'demote',
+			'role'   => 'mod',
+		) );
+		$response = $this->server->dispatch( $request );
+
+		$this->assertEquals( 200, $response->get_status() );
+
+		$data = $response->get_data();
+		$user = bp_rest_get_user( $data[0]['id'] );
+
+		$member_object = new BP_Groups_Member( $user->ID, $g1 );
+
+		$this->assertTrue( $u2 === $user->ID );
+		$this->assertTrue( (bool) $member_object->is_mod );
+		$this->assertFalse( (bool) $member_object->is_admin );
+	}
+
+	/**
+	 * @group update_item
+	 * @group demote_member
+	 */
+	public function test_group_admin_can_not_demote_himself() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
+
+		$g1 = $this->bp::factory()->group->create( array( 'creator_id' => $u2 ) );
+
+		$this->populate_group_with_members( [ $u1, $u3 ], $g1 );
+
+		$this->bp::set_current_user( $u2 );
+
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u2 );
+		$request->set_query_params( array( 'action' => 'demote' ) );
+		$response = $this->server->dispatch( $request );
+
+		$this->assertErrorResponse( 'bp_rest_group_member_cannot_demote', $response, rest_authorization_required_code() );
+	}
+
+	/**
+	 * @group update_item
+	 * @group demote_member
+	 */
+	public function test_group_admin_can_not_demote_already_group_members() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
+
+		$g1 = $this->bp::factory()->group->create( array( 'creator_id' => $u2 ) );
+
+		$this->populate_group_with_members( [ $u1, $u3 ], $g1 );
+
+		$this->bp::set_current_user( $u2 );
+
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u1 );
+		$request->set_query_params( array( 'action' => 'demote' ) );
+		$response = $this->server->dispatch( $request );
+
+		$this->assertErrorResponse( 'bp_rest_group_member_failed_to_demote', $response, 500 );
+	}
+
+	/**
+	 * @group update_item
+	 * @group demote_member
+	 */
+	public function test_member_can_not_demote_another_member() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
+
+		$g1 = $this->bp::factory()->group->create( array( 'creator_id' => $u2 ) );
+
+		$this->populate_group_with_members( [ $u1, $u3 ], $g1 );
+
+		$this->bp::set_current_user( $u3 );
+
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u1 );
+		$request->set_query_params( array( 'action' => 'demote' ) );
+		$response = $this->server->dispatch( $request );
+
+		$this->assertErrorResponse( 'bp_rest_group_member_cannot_demote', $response, rest_authorization_required_code() );
+	}
+
+	/**
+	 * @group update_item
+	 * @group demote_member
+	 */
+	public function test_member_can_not_demote_himself() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
+
+		$g1 = $this->bp::factory()->group->create( array( 'creator_id' => $u2 ) );
+
+		$this->populate_group_with_members( [ $u1, $u3 ], $g1 );
+
+		$this->bp::set_current_user( $u3 );
+
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . $g1 . '/members/' . $u3 );
+		$request->set_query_params( array( 'action' => 'demote' ) );
+		$response = $this->server->dispatch( $request );
+
+		$this->assertErrorResponse( 'bp_rest_group_member_cannot_demote', $response, rest_authorization_required_code() );
+	}
+
+	/**
+	 * @group update_item
+	 * @group promote_member
+	 */
+	public function test_update_item_invalid_group_id() {
+		$u = static::factory()->user->create();
+
+		$this->bp::set_current_user( $this->user );
+
+		$request = new WP_REST_Request( 'PUT', $this->endpoint_url . REST_TESTS_IMPOSSIBLY_HIGH_NUMBER . '/members/' . $u );
+		$request->set_query_params( array(
+			'action' => 'promote',
+			'role'   => 'mod',
+		) );
+		$response = $this->server->dispatch( $request );
+
+		$this->assertErrorResponse( 'bp_rest_group_invalid_id', $response, 404 );
+	}
+
+	/**
 	 * @group update_item
 	 */
 	public function test_update_item_user_not_logged_in() {
@@ -810,9 +1178,9 @@ public function test_update_item_user_not_logged_in() {
 	 * @group delete_item
 	 */
 	public function test_delete_item() {
-		$u1 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
-		$u2 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
-		$u3 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
 
 		$g1 = $this->bp::factory()->group->create( array(
 			'creator_id' => $u3,
@@ -824,7 +1192,6 @@ public function test_delete_item() {
 
 		$request = new WP_REST_Request( 'DELETE', $this->endpoint_url . $g1 . '/members/' . $u1 );
 
-		$request->set_param( 'context', 'view' );
 		$response = $this->server->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
@@ -834,15 +1201,16 @@ public function test_delete_item() {
 
 		$user = bp_rest_get_user( $all_data['previous']['id'] );
 		$this->assertFalse( groups_is_user_member( $user->ID, $g1 ) );
+		$this->assertSame( $u1, $user->ID );
 	}
 
 	/**
 	 * @group delete_item
 	 */
 	public function test_member_can_remove_himself_from_group() {
-		$u1 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
-		$u2 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
-		$u3 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
 
 		$g1 = $this->bp::factory()->group->create( array(
 			'creator_id' => $u3,
@@ -854,7 +1222,6 @@ public function test_member_can_remove_himself_from_group() {
 
 		$request = new WP_REST_Request( 'DELETE', $this->endpoint_url . $g1 . '/members/' . $u1 );
 
-		$request->set_param( 'context', 'view' );
 		$response = $this->server->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
@@ -869,10 +1236,10 @@ public function test_member_can_remove_himself_from_group() {
 	/**
 	 * @group delete_item
 	 */
-	public function test_member_can_not_remove_others_from_group() {
-		$u1 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
-		$u2 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
-		$u3 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
+	public function test_banned_member_can_not_remove_himself_from_group() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
 
 		$g1 = $this->bp::factory()->group->create( array(
 			'creator_id' => $u3,
@@ -880,11 +1247,34 @@ public function test_member_can_not_remove_others_from_group() {
 
 		$this->populate_group_with_members( [ $u1, $u2 ], $g1 );
 
+		$group_member = new BP_Groups_Member( $u1, $g1 );
+		$group_member->ban();
+
 		$this->bp::set_current_user( $u1 );
 
-		$request = new WP_REST_Request( 'DELETE', $this->endpoint_url . $g1 . '/members/' . $u2 );
+		$request  = new WP_REST_Request( 'DELETE', $this->endpoint_url . $g1 . '/members/' . $u1 );
+		$response = $this->server->dispatch( $request );
+
+		$this->assertErrorResponse( 'bp_rest_authorization_required', $response, rest_authorization_required_code() );
+	}
+
+	/**
+	 * @group delete_item
+	 */
+	public function test_member_can_not_remove_others_from_group() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
+
+		$g1 = $this->bp::factory()->group->create( array(
+			'creator_id' => $u3,
+		) );
+
+		$this->populate_group_with_members( [ $u1, $u2 ], $g1 );
+
+		$this->bp::set_current_user( $u1 );
 
-		$request->set_param( 'context', 'view' );
+		$request  = new WP_REST_Request( 'DELETE', $this->endpoint_url . $g1 . '/members/' . $u2 );
 		$response = $this->server->dispatch( $request );
 
 		$this->assertErrorResponse( 'bp_rest_authorization_required', $response, rest_authorization_required_code() );
@@ -894,12 +1284,12 @@ public function test_member_can_not_remove_others_from_group() {
 	 * @group delete_item
 	 */
 	public function test_group_admin_can_remove_member_from_group() {
-		$u1 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
-		$u2 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
-		$u3 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
 
 		$g1 = $this->bp::factory()->group->create( array(
-			'creator_id' => $u3,
+			'creator_id' => $u3, // <- group admin.
 		) );
 
 		$this->populate_group_with_members( [ $u1, $u2 ], $g1 );
@@ -907,37 +1297,170 @@ public function test_group_admin_can_remove_member_from_group() {
 		$this->bp::set_current_user( $u3 );
 
 		$request = new WP_REST_Request( 'DELETE', $this->endpoint_url . $g1 . '/members/' . $u1 );
+		$response = $this->server->dispatch( $request );
+
+		$this->assertEquals( 200, $response->get_status() );
+
+		$all_data = $response->get_data();
+
+		$user = bp_rest_get_user( $all_data['previous']['id'] );
+		$this->assertFalse( groups_is_user_member( $user->ID, $g1 ) );
+		$this->assertSame( $u1, $user->ID );
+	}
+
+	/**
+	 * @group delete_item
+	 */
+	public function test_group_admin_can_remove_himself_from_group() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
+
+		$g1 = $this->bp::factory()->group->create( array(
+			'creator_id' => $u2, // <- group admin.
+		) );
 
-		$request->set_param( 'context', 'view' );
+		$this->populate_group_with_members( [ $u1, $u3 ], $g1 );
+
+		// Another group admin.
+		$group_member = new BP_Groups_Member( $u3, $g1 );
+		$group_member->promote( 'admin' );
+
+		$this->bp::set_current_user( $u2 );
+
+		$request  = new WP_REST_Request( 'DELETE', $this->endpoint_url . $g1 . '/members/' . $u2 );
 		$response = $this->server->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
 
 		$all_data = $response->get_data();
-		$this->assertNotEmpty( $all_data );
 
 		$user = bp_rest_get_user( $all_data['previous']['id'] );
 		$this->assertFalse( groups_is_user_member( $user->ID, $g1 ) );
+		$this->assertSame( $u2, $user->ID );
 	}
 
 	/**
 	 * @group delete_item
 	 */
-	public function test_group_admin_can_not_remove_himself_from_group() {
-		$u1 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
-		$u2 = static::factory()->user->create( array( 'role' => 'subscriber' ) );
+	public function test_last_group_admin_can_not_remove_himself_from_group() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
 
 		$g1 = $this->bp::factory()->group->create( array(
-			'creator_id' => $u2,
+			'creator_id' => $u2, // <- group admin.
 		) );
 
 		$this->populate_group_with_members( [ $u1 ], $g1 );
 
 		$this->bp::set_current_user( $u2 );
 
-		$request = new WP_REST_Request( 'DELETE', $this->endpoint_url . $g1 . '/members/' . $u2 );
+		$request  = new WP_REST_Request( 'DELETE', $this->endpoint_url . $g1 . '/members/' . $u2 );
+		$response = $this->server->dispatch( $request );
+
+		$this->assertErrorResponse( 'bp_rest_authorization_required', $response, rest_authorization_required_code() );
+	}
+
+	/**
+	 * @group delete_item
+	 */
+	public function test_group_admin_can_remove_another_group_admin() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
+
+		$g1 = $this->bp::factory()->group->create( array(
+			'creator_id' => $u1, // <- group admin.
+		) );
+
+		$this->populate_group_with_members( [ $u2, $u3 ], $g1 );
+
+		$group_member = new BP_Groups_Member( $u3, $g1 );
+		$group_member->promote( 'admin' );
+
+		$this->bp::set_current_user( $u3 );
+
+		$request  = new WP_REST_Request( 'DELETE', $this->endpoint_url . $g1 . '/members/' . $u1 );
+		$response = $this->server->dispatch( $request );
+
+		$this->assertEquals( 200, $response->get_status() );
+
+		$all_data = $response->get_data();
+
+		$user = bp_rest_get_user( $all_data['previous']['id'] );
+		$this->assertFalse( groups_is_user_member( $user->ID, $g1 ) );
+		$this->assertSame( $u1, $user->ID );
+	}
+
+	/**
+	 * @group delete_item
+	 */
+	public function test_site_admin_can_not_remove_himself_group_admin() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
+
+		$g1 = $this->bp::factory()->group->create( array(
+			'creator_id' => $u1, // <- group admin.
+		) );
+
+		$this->populate_group_with_members( [ $u2, $u3 ], $g1 );
+
+		$this->bp::set_current_user( $this->user );
+
+		$request  = new WP_REST_Request( 'DELETE', $this->endpoint_url . $g1 . '/members/' . $this->user );
+		$response = $this->server->dispatch( $request );
+
+		$this->assertErrorResponse( 'bp_rest_group_member_failed_to_remove', $response, 500 );
+	}
+
+	/**
+	 * @group delete_item
+	 */
+	public function test_site_admin_can_remove_group_admin() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+		$u3 = static::factory()->user->create();
+
+		$g1 = $this->bp::factory()->group->create( array(
+			'creator_id' => $u1, // <- group admin.
+		) );
+
+		$this->populate_group_with_members( [ $u2, $u3 ], $g1 );
+
+		$group_member = new BP_Groups_Member( $u3, $g1 );
+		$group_member->promote( 'admin' );
+
+		$this->bp::set_current_user( $this->user );
+
+		$request  = new WP_REST_Request( 'DELETE', $this->endpoint_url . $g1 . '/members/' . $u1 );
+		$response = $this->server->dispatch( $request );
+
+		$this->assertEquals( 200, $response->get_status() );
+
+		$all_data = $response->get_data();
+
+		$user = bp_rest_get_user( $all_data['previous']['id'] );
+		$this->assertFalse( groups_is_user_member( $user->ID, $g1 ) );
+		$this->assertSame( $u1, $user->ID );
+	}
+
+	/**
+	 * @group delete_item
+	 */
+	public function test_site_admin_can_not_remove_last_group_admin() {
+		$u1 = static::factory()->user->create();
+		$u2 = static::factory()->user->create();
+
+		$g1 = $this->bp::factory()->group->create( array(
+			'creator_id' => $u1, // <- group admin.
+		) );
+
+		$this->populate_group_with_members( [ $u1, $u2 ], $g1 );
+
+		$this->bp::set_current_user( $this->user );
 
-		$request->set_param( 'context', 'view' );
+		$request  = new WP_REST_Request( 'DELETE', $this->endpoint_url . $g1 . '/members/' . $u1 );
 		$response = $this->server->dispatch( $request );
 
 		$this->assertErrorResponse( 'bp_rest_authorization_required', $response, rest_authorization_required_code() );