tests/tests/transition/src/android/transition/cts/TransitionListenerAdapterTest.java

/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package android.transition.cts;

import android.transition.TransitionListenerAdapter;

import androidx.test.filters.SmallTest;
import androidx.test.runner.AndroidJUnit4;

import org.junit.Test;
import org.junit.runner.RunWith;

@SmallTest
@RunWith(AndroidJUnit4.class)
public class TransitionListenerAdapterTest {
    /**
     * TransitionListenerAdapter has a noop implementation of the TransitionListener interface.
     * It should do nothing, including when nulls are passed to it.
     * <p>
     * Mostly this test pokes the implementation so that it is counted as tested. There isn't
     * much to test here since it has no implementation.
     */
    @Test
    public void testNullOk() {
        TransitionListenerAdapter adapter = new MyAdapter();
        adapter.onTransitionStart(null);
        adapter.onTransitionEnd(null);
        adapter.onTransitionCancel(null);
        adapter.onTransitionPause(null);
        adapter.onTransitionResume(null);
    }

    private static class MyAdapter extends TransitionListenerAdapter {
    }
}