Added navigation plugin

Summary: Adding the auto-genrated scarf files from creating the Flipper navigation plugin. GK for this plugin is flipper-navigation.

Reviewed By: jknoxville, danielbuechele

Differential Revision: D16119841

fbshipit-source-id: 74e19c82dc95e73fe2ae06d1eb8cef2456b81931

android/src/test/java/com/facebook/flipper/plugins/navigation/NavigationFlipperPluginTest.java

@@ -0,0 +1,37 @@
+/*
+ *  Copyright (c) 2018-present, Facebook, Inc.
+ *
+ *  This source code is licensed under the MIT license found in the LICENSE
+ *  file in the root directory of this source tree.
+ *
+ */
+package com.facebook.flipper.plugins.navigation;
+
+import static org.hamcrest.CoreMatchers.hasItem;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+import com.facebook.flipper.core.FlipperObject;
+import com.facebook.flipper.testing.FlipperConnectionMock;
+import com.facebook.flipper.testing.FlipperResponderMock;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+
+@RunWith(RobolectricTestRunner.class)
+public class NavigationFlipperPluginTest {
+  @Test
+  public void greetingTest() throws Exception {
+    final NavigationFlipperPlugin plugin = new NavigationFlipperPlugin();
+    final FlipperConnectionMock connection = new FlipperConnectionMock();
+    final FlipperResponderMock responder = new FlipperResponderMock();
+
+    plugin.onConnect(connection);
+    connection.receivers.get("greet").onReceive(null, responder);
+
+    assertThat(
+        responder.successes, hasItem(new FlipperObject.Builder().put("greeting", "Hello").build()));
+  }
+}
+
+/* @scarf-info: do not remove, more info: https://fburl.com/scarf */
+/* @scarf-generated: flipper-plugin android/test/PluginTest.java 0bfa32e5-fb15-4705-81f8-86260a1f3f8e */