update

packages/google_sign_in/google_sign_in/android/build.gradle

@@ -36,6 +36,6 @@ android {
 dependencies {
     implementation 'com.google.android.gms:play-services-auth:16.0.1'
     implementation 'com.google.guava:guava:20.0'
-    testImplementation 'junit:junit:4.12'
-    testImplementation 'org.mockito:mockito-core:2.17.0'
+    testCompile 'junit:junit:4.12'
+    testCompile 'org.mockito:mockito-core:2.17.0'
 }

packages/google_sign_in/google_sign_in/example/android/app/src/test/java/io/flutter/plugins/googlesignintests/GoogleSignInPluginTests.java

@@ -0,0 +1,41 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package io.flutter.plugins.googlesignintests;
+
+import static org.mockito.Mockito.when;
+
+import android.app.Activity;
+import android.app.Application;
+import android.content.Context;
+import io.flutter.plugin.common.BinaryMessenger;
+import io.flutter.plugin.common.PluginRegistry;
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+public class GoogleSignInPluginTests {
+
+  @Mock Activity activity;
+  @Mock Context context;
+  @Mock PluginRegistry.Registrar mockRegistrar;
+  @Mock BinaryMessenger mockMessenger;
+  @Mock Application mockApplication;
+
+  @Before
+  public void setUp() {
+    MockitoAnnotations.initMocks(this);
+    when(mockRegistrar.activity()).thenReturn(activity);
+    when(mockRegistrar.messenger()).thenReturn(mockMessenger);
+    when(mockRegistrar.context()).thenReturn(context);
+  }
+//
+//  @Test
+//  public void registerWith_doNotCrashWhenRegisterContextIsActivity_V1Embedding() {
+//    when(mockRegistrar.context()).thenReturn(activity);
+//    when(activity.getApplicationContext()).thenReturn(mockApplication);
+//    InAppPurchasePlugin.registerWith(mockRegistrar);
+//  }
+}