Add a unit test for the close button on the caption

Flag: EXEMPT Adding a new test case
Bug: 356843241
Test: WMShellUnitTests
Change-Id: I2d76f6ca54c2d067262394331311f3051ac430e0
diff --git a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecorViewModelTests.kt b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecorViewModelTests.kt
index 6d68797..fa905e2 100644
--- a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecorViewModelTests.kt
+++ b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecorViewModelTests.kt
@@ -57,6 +57,7 @@
 import android.view.View
 import android.view.WindowInsets.Type.statusBars
 import android.window.WindowContainerTransaction
+import android.window.WindowContainerTransaction.HierarchyOp
 import androidx.test.filters.SmallTest
 import com.android.dx.mockito.inline.extended.ExtendedMockito.doReturn
 import com.android.dx.mockito.inline.extended.ExtendedMockito.mockitoSession
@@ -356,6 +357,36 @@
     }
 
     @Test
+    fun testCloseButtonInFreeform() {
+        val task = createTask(windowingMode = WINDOWING_MODE_FREEFORM)
+        val windowDecor = setUpMockDecorationForTask(task)
+
+        onTaskOpening(task)
+        val onClickListenerCaptor = argumentCaptor<View.OnClickListener>()
+        verify(windowDecor).setCaptionListeners(
+            onClickListenerCaptor.capture(), any(), any(), any())
+
+        val onClickListener = onClickListenerCaptor.firstValue
+        val view = mock(View::class.java)
+        whenever(view.id).thenReturn(R.id.close_window)
+
+        val freeformTaskTransitionStarter = mock(FreeformTaskTransitionStarter::class.java)
+        desktopModeWindowDecorViewModel
+            .setFreeformTaskTransitionStarter(freeformTaskTransitionStarter)
+
+        onClickListener.onClick(view)
+
+        val transactionCaptor = argumentCaptor<WindowContainerTransaction>()
+        verify(freeformTaskTransitionStarter).startRemoveTransition(transactionCaptor.capture())
+        val wct = transactionCaptor.firstValue
+
+        assertEquals(1, wct.getHierarchyOps().size)
+        assertEquals(HierarchyOp.HIERARCHY_OP_TYPE_REMOVE_TASK,
+                     wct.getHierarchyOps().get(0).getType())
+        assertEquals(task.token.asBinder(), wct.getHierarchyOps().get(0).getContainer())
+    }
+
+    @Test
     @EnableFlags(Flags.FLAG_ENABLE_DESKTOP_WINDOWING_MODALS_POLICY)
     fun testDecorationIsCreatedForTopTranslucentActivitiesWithStyleFloating() {
         val task = createTask(windowingMode = WINDOWING_MODE_FULLSCREEN, focused = true).apply {