com/android/setupwizardlib/template/TemplateLayoutMixinTest.java

/*
 * Copyright (C) 2017 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 com.android.setupwizardlib.template;

import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;

import android.content.Context;
import android.support.test.InstrumentationRegistry;
import android.support.test.filters.SmallTest;
import android.support.test.runner.AndroidJUnit4;
import com.android.setupwizardlib.TemplateLayout;
import com.android.setupwizardlib.test.R;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;

@RunWith(AndroidJUnit4.class)
@SmallTest
public class TemplateLayoutMixinTest {

  private TestTemplateLayout mLayout;

  @Before
  public void setUp() throws Exception {
    mLayout = new TestTemplateLayout(InstrumentationRegistry.getContext());
  }

  @Test
  public void testGetMixin() {
    final TestMixin mixin = mLayout.getMixin(TestMixin.class);
    assertNotNull("TestMixin should not be null", mixin);
    assertTrue(
        "TestMixin should be an instance of TestMixinSubclass. "
            + "Found "
            + mixin.getClass()
            + " instead.",
        mixin instanceof TestMixinSubclass);

    // Mixin must be retrieved using the interface it's registered with, not the concrete class,
    // although they are often the same.
    assertNull("TestMixinSubclass should be null", mLayout.getMixin(TestMixinSubclass.class));
  }

  private static class TestTemplateLayout extends TemplateLayout {

    TestTemplateLayout(Context context) {
      super(context, R.layout.test_template, R.id.suw_layout_content);
      registerMixin(TestMixin.class, new TestMixinSubclass());
    }
  }

  private static class TestMixin implements Mixin {}

  private static class TestMixinSubclass extends TestMixin {}
}