add cart frozen state

commercetools-models/src/main/java/io/sphere/sdk/carts/CartState.java

@@ -20,7 +20,10 @@ public enum CartState implements SphereEnumeration {
     /**
      The cart was ordered. No further operations on the cart are allowed.
      */
-    ORDERED;
+    ORDERED,
+
+    FROZEN
+    ;
 
     public static CartState defaultValue() {
         return CartState.ACTIVE;

commercetools-models/src/main/java/io/sphere/sdk/carts/commands/updateactions/FreezeCart.java

@@ -0,0 +1,14 @@
+package io.sphere.sdk.carts.commands.updateactions;
+
+import io.sphere.sdk.carts.Cart;
+import io.sphere.sdk.commands.UpdateActionImpl;
+
+public class FreezeCart extends UpdateActionImpl<Cart> {
+    private FreezeCart() {
+        super("freezeCart");
+    }
+
+    public static FreezeCart of() {
+        return new FreezeCart();
+    }
+}

commercetools-models/src/main/java/io/sphere/sdk/carts/commands/updateactions/UnfreezeCart.java

@@ -0,0 +1,14 @@
+package io.sphere.sdk.carts.commands.updateactions;
+
+import io.sphere.sdk.carts.Cart;
+import io.sphere.sdk.commands.UpdateActionImpl;
+
+public class UnfreezeCart extends UpdateActionImpl<Cart> {
+    private UnfreezeCart() {
+        super("unfreezeCart");
+    }
+
+    public static UnfreezeCart of() {
+        return new UnfreezeCart();
+    }
+}

commercetools-models/src/test/java/io/sphere/sdk/carts/commands/CartUpdateCommandIntegrationTest.java

@@ -595,6 +595,23 @@ public void recalculate() throws Exception {
         });
     }
 
+    @Test
+    public void freezeUnfreeze() throws Exception {
+        withCart(client(), emptyCart -> {
+            assertThat(emptyCart.getCartState())
+                    .isEqualTo(CartState.ACTIVE);
+            final Cart frozenCart = client().executeBlocking(CartUpdateCommand.of(emptyCart, FreezeCart.of()));
+
+            assertThat(frozenCart.getCartState())
+                    .isEqualTo(CartState.FROZEN);
+
+            final Cart unfrozenCart = client().executeBlocking(CartUpdateCommand.of(frozenCart, UnfreezeCart.of()));
+            assertThat(frozenCart.getCartState())
+                    .isEqualTo(CartState.ACTIVE);
+            return unfrozenCart;
+        });
+    }
+
     @Test
     public void recalculateAndUpdateProductData() throws Exception {
         withEmptyCartAndProduct(client(), (emptyCart, product) -> {