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Reviewed By: matryoshcow

Differential Revision: D3432084

fbshipit-source-id: fa94b1aca40c931cc273a5561adf37f458aaa0ff

ReactAndroid/src/androidTest/java/com/facebook/react/tests/LayoutEventsTestCase.java

@@ -0,0 +1,41 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc.
+ * All rights reserved.
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+package com.facebook.react.tests;
+
+import com.facebook.react.testing.ReactAppInstrumentationTestCase;
+import com.facebook.react.testing.ReactInstanceSpecForTest;
+import com.facebook.react.testing.StringRecordingModule;
+
+/**
+ * Simple test to verify that layout events (onLayout) propagate to JS from native.
+ */
+public class LayoutEventsTestCase extends ReactAppInstrumentationTestCase {
+
+  private StringRecordingModule mStringRecordingModule;
+
+  @Override
+  protected String getReactApplicationKeyUnderTest() {
+    return "LayoutEventsTestApp";
+  }
+
+  /**
+   * Creates a UI in JS and verifies the onLayout handler is called.
+   */
+  public void testOnLayoutCalled() {
+    assertEquals(1, mStringRecordingModule.getCalls().size());
+    assertEquals("10,10-100x100", mStringRecordingModule.getCalls().get(0));
+  }
+
+  @Override
+  protected ReactInstanceSpecForTest createReactInstanceSpecForTest() {
+    mStringRecordingModule = new StringRecordingModule();
+    return super.createReactInstanceSpecForTest()
+        .addNativeModule(mStringRecordingModule);
+  }
+}