[pigeon] Consolidate platform test harnesses part 2 - Android

packages/pigeon/platform_tests/alternate_language_test_plugin/android/build.gradle

@@ -32,4 +32,21 @@ android {
     defaultConfig {
         minSdkVersion 16
     }
+
+    testOptions {
+        unitTests.includeAndroidResources = true
+        unitTests.returnDefaultValues = true
+        unitTests.all {
+            testLogging {
+               events "passed", "skipped", "failed", "standardOut", "standardError"
+               outputs.upToDateWhen {false}
+               showStandardStreams = true
+            }
+        }
+    }
+
+    dependencies {
+        testImplementation 'junit:junit:4.+'
+        testImplementation "org.mockito:mockito-core:3.+"
+    }
 }

packages/pigeon/platform_tests/alternate_language_test_plugin/android/src/main/.gitignore

@@ -0,0 +1,5 @@
+# TODO(stuartmorgan): Remove this, so that review will show the effects of
+# changes on generated files. This will need a way to avoid unnecessary churn,
+# such as a flag to suppress version stamp generation.
+*.java
+!AlternateLanguageTestPlugin.kt

packages/pigeon/platform_tests/android_unit_tests/android/app/src/test/java/com/example/android_unit_tests/AllDatatypesTest.java → packages/pigeon/platform_tests/alternate_language_test_plugin/android/src/test/java/com/example/alternate_language_test_plugin/AllDatatypesTest.java

@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-package com.example.android_unit_tests;
+package com.example.alternate_language_test_plugin;
 
 import static org.junit.Assert.*;
 import static org.mockito.Mockito.*;
 
-import com.example.android_unit_tests.AllDatatypes.*;
+import com.example.alternate_language_test_plugin.AllDatatypes.*;
 import io.flutter.plugin.common.BinaryMessenger;
 import java.nio.ByteBuffer;
 import java.util.ArrayList;

packages/pigeon/platform_tests/android_unit_tests/android/app/src/test/java/com/example/android_unit_tests/AsyncTest.java → packages/pigeon/platform_tests/alternate_language_test_plugin/android/src/test/java/com/example/alternate_language_test_plugin/AsyncTest.java

@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-package com.example.android_unit_tests;
+package com.example.alternate_language_test_plugin;
 
 import static org.junit.Assert.*;
 import static org.mockito.Mockito.*;
 
-import com.example.android_unit_tests.AsyncHandlers.*;
+import com.example.alternate_language_test_plugin.AsyncHandlers.*;
 import io.flutter.plugin.common.BinaryMessenger;
 import io.flutter.plugin.common.MessageCodec;
 import java.nio.ByteBuffer;

packages/pigeon/platform_tests/android_unit_tests/android/app/src/test/java/com/example/android_unit_tests/EnumTest.java → packages/pigeon/platform_tests/alternate_language_test_plugin/android/src/test/java/com/example/alternate_language_test_plugin/EnumTest.java

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-package com.example.android_unit_tests;
+package com.example.alternate_language_test_plugin;
 
 import static org.junit.Assert.*;
 

packages/pigeon/platform_tests/android_unit_tests/android/app/src/test/java/com/example/android_unit_tests/ListTest.java → packages/pigeon/platform_tests/alternate_language_test_plugin/android/src/test/java/com/example/alternate_language_test_plugin/ListTest.java

@@ -2,13 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-package com.example.android_unit_tests;
+package com.example.alternate_language_test_plugin;
 
 import static org.junit.Assert.*;
 import static org.mockito.Mockito.*;
 
-import com.example.android_unit_tests.PigeonList.EchoApi;
-import com.example.android_unit_tests.PigeonList.TestMessage;
+import com.example.alternate_language_test_plugin.PigeonList.EchoApi;
+import com.example.alternate_language_test_plugin.PigeonList.TestMessage;
 import io.flutter.plugin.common.BinaryMessenger;
 import java.nio.ByteBuffer;
 import java.util.ArrayList;

packages/pigeon/platform_tests/android_unit_tests/android/app/src/test/java/com/example/android_unit_tests/MultipleArityTest.java → packages/pigeon/platform_tests/alternate_language_test_plugin/android/src/test/java/com/example/alternate_language_test_plugin/MultipleArityTest.java

@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-package com.example.android_unit_tests;
+package com.example.alternate_language_test_plugin;
 
 import static org.junit.Assert.*;
 import static org.mockito.Mockito.*;
 
-import com.example.android_unit_tests.MultipleArity.MultipleArityFlutterApi;
+import com.example.alternate_language_test_plugin.MultipleArity.MultipleArityFlutterApi;
 import io.flutter.plugin.common.BinaryMessenger;
 import java.nio.ByteBuffer;
 import java.util.ArrayList;

packages/pigeon/platform_tests/android_unit_tests/android/app/src/test/java/com/example/android_unit_tests/NonNullFieldsTest.java → packages/pigeon/platform_tests/alternate_language_test_plugin/android/src/test/java/com/example/alternate_language_test_plugin/NonNullFieldsTest.java

@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-package com.example.android_unit_tests;
+package com.example.alternate_language_test_plugin;
 
 import static org.junit.Assert.*;
 
-import com.example.android_unit_tests.NonNullFields.NonNullFieldSearchRequest;
+import com.example.alternate_language_test_plugin.NonNullFields.NonNullFieldSearchRequest;
 import java.lang.IllegalStateException;
 import org.junit.Test;
 

packages/pigeon/platform_tests/android_unit_tests/android/app/src/test/java/com/example/android_unit_tests/NullFieldsTest.java → packages/pigeon/platform_tests/alternate_language_test_plugin/android/src/test/java/com/example/alternate_language_test_plugin/NullFieldsTest.java

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-package com.example.android_unit_tests;
+package com.example.alternate_language_test_plugin;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNull;

packages/pigeon/platform_tests/android_unit_tests/android/app/src/test/java/com/example/android_unit_tests/NullableReturnsTest.java → packages/pigeon/platform_tests/alternate_language_test_plugin/android/src/test/java/com/example/alternate_language_test_plugin/NullableReturnsTest.java

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-package com.example.android_unit_tests;
+package com.example.alternate_language_test_plugin;
 
 import static org.junit.Assert.*;
 import static org.mockito.Mockito.*;

packages/pigeon/platform_tests/android_unit_tests/android/app/src/test/java/com/example/android_unit_tests/PigeonTest.java → packages/pigeon/platform_tests/alternate_language_test_plugin/android/src/test/java/com/example/alternate_language_test_plugin/PigeonTest.java

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-package com.example.android_unit_tests;
+package com.example.alternate_language_test_plugin;
 
 import static org.junit.Assert.*;
 import static org.mockito.Mockito.*;

packages/pigeon/platform_tests/android_unit_tests/android/app/src/test/java/com/example/android_unit_tests/PrimitiveTest.java → packages/pigeon/platform_tests/alternate_language_test_plugin/android/src/test/java/com/example/alternate_language_test_plugin/PrimitiveTest.java

@@ -2,13 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-package com.example.android_unit_tests;
+package com.example.alternate_language_test_plugin;
 
 import static org.junit.Assert.*;
 import static org.mockito.Mockito.*;
 
-import com.example.android_unit_tests.Primitive.PrimitiveFlutterApi;
-import com.example.android_unit_tests.Primitive.PrimitiveHostApi;
+import com.example.alternate_language_test_plugin.Primitive.PrimitiveFlutterApi;
+import com.example.alternate_language_test_plugin.Primitive.PrimitiveHostApi;
 import io.flutter.plugin.common.BinaryMessenger;
 import io.flutter.plugin.common.MessageCodec;
 import java.nio.ByteBuffer;