Test real hasStrings call but not working due to inability to mock ClipboardManager

Author: justinmc

shell/platform/android/io/flutter/plugin/platform/PlatformPlugin.java

@@ -30,7 +30,8 @@ public class PlatformPlugin {
   private PlatformChannel.SystemChromeStyle currentTheme;
   private int mEnabledOverlays;
 
-  private final PlatformChannel.PlatformMessageHandler mPlatformMessageHandler =
+  @VisibleForTesting
+  final PlatformChannel.PlatformMessageHandler mPlatformMessageHandler =
       new PlatformChannel.PlatformMessageHandler() {
         @Override
         public void playSystemSound(@NonNull PlatformChannel.SoundType soundType) {

shell/platform/android/test/io/flutter/plugin/platform/PlatformPluginTest.java

@@ -1,6 +1,7 @@
 package io.flutter.plugin.platform;
 
 import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.assertFalse;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.verify;
@@ -28,8 +29,9 @@
 import org.robolectric.RobolectricTestRunner;
 import org.robolectric.RuntimeEnvironment;
 import org.robolectric.annotation.Config;
+import org.robolectric.shadows.ShadowClipboardManager;
 
-@Config(manifest = Config.NONE)
+@Config(manifest = Config.NONE, shadows = ShadowClipboardManager.class)
 @RunWith(RobolectricTestRunner.class)
 public class PlatformPluginTest {
   @Config(sdk = 16)
@@ -71,4 +73,23 @@ public void platformPlugin_hasStringsMessage() {
     }
     verify(mockResult).success(Matchers.refEq(expected));
   }
+
+  @Test
+  public void platformPlugin_hasStrings() {
+    View fakeDecorView = mock(View.class);
+    Window fakeWindow = mock(Window.class);
+    when(fakeWindow.getDecorView()).thenReturn(fakeDecorView);
+    Activity fakeActivity = mock(Activity.class);
+    when(fakeActivity.getWindow()).thenReturn(fakeWindow);
+    PlatformChannel fakePlatformChannel = mock(PlatformChannel.class);
+    PlatformPlugin platformPlugin = new PlatformPlugin(fakeActivity, fakePlatformChannel);
+
+    ClipboardManager clipboardManager =
+        RuntimeEnvironment.application.getSystemService(ClipboardManager.class);
+    clipboardManager.setText("iamastring");
+    assertTrue(platformPlugin.mPlatformMessageHandler.clipboardHasStrings());
+
+    clipboardManager.setText("");
+    assertFalse(platformPlugin.mPlatformMessageHandler.clipboardHasStrings());
+  }
 }