Fix unit tests.

packages/editor/src/components/post-preview-button/test/index.js

@@ -139,22 +139,6 @@ describe( 'PostPreviewButton', () => {
 		).toBeInTheDocument();
 	} );
 
-	it( 'should be disabled if post is not saveable.', () => {
-		mockUseSelect( { isEditedPostSaveable: () => false } );
-
-		render( <PostPreviewButton /> );
-
-		expect( screen.getByRole( 'button' ) ).toBeDisabled();
-	} );
-
-	it( 'should not be disabled if post is saveable.', () => {
-		mockUseSelect( { isEditedPostSaveable: () => true } );
-
-		render( <PostPreviewButton /> );
-
-		expect( screen.getByRole( 'button' ) ).toBeEnabled();
-	} );
-
 	it( 'should set `href` to edited post preview link if specified.', () => {
 		const url = 'https://wordpress.org';
 		mockUseSelect( {

packages/editor/src/store/selectors.js

@@ -1035,7 +1035,7 @@ export function getPermalinkParts( state ) {
  * @return {boolean} Is locked.
  */
 export function isPostLocked( state ) {
-	return state.postLock.isLocked;
+	return state.postLock?.isLocked ?? false;
 }
 
 /**

packages/editor/src/store/test/selectors.js

@@ -1421,6 +1421,27 @@ describe( 'selectors', () => {
 
 			expect( isEditedPostSaveable( state ) ).toBe( true );
 		} );
+
+		it( 'should return false if the post is locked', () => {
+			const state = {
+				editor: {
+					present: {
+						blocks: {
+							value: [],
+						},
+						edits: {},
+					},
+				},
+				initialEdits: {},
+				currentPost: {},
+				saving: {},
+				postLock: {
+					isLocked: true,
+				},
+			};
+
+			expect( isEditedPostSaveable( state ) ).toBe( false );
+		} );
 	} );
 
 	describe( 'isEditedPostAutosaveable', () => {