BaseDynamicCoordinatorLayoutTest.java

/*
 * Copyright (C) 2015 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.support.design.widget;

import static android.support.test.espresso.matcher.ViewMatchers.isAssignableFrom;

import static org.hamcrest.CoreMatchers.allOf;
import static org.hamcrest.Matchers.any;

import android.support.annotation.LayoutRes;
import android.support.design.test.R;
import android.support.test.annotation.UiThreadTest;
import android.support.test.espresso.UiController;
import android.support.test.espresso.ViewAction;
import android.support.v4.view.ViewCompat;
import android.view.View;
import android.view.ViewStub;

import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.hamcrest.TypeSafeMatcher;
import org.junit.After;

/**
 * Base class for tests that are exercising various aspects of {@link CoordinatorLayout}.
 */
public abstract class BaseDynamicCoordinatorLayoutTest
        extends BaseInstrumentationTestCase<DynamicCoordinatorLayoutActivity> {
    protected CoordinatorLayout mCoordinatorLayout;

    public BaseDynamicCoordinatorLayoutTest() {
        super(DynamicCoordinatorLayoutActivity.class);
    }

    @UiThreadTest
    @After
    public void tearDown() {
        // Now that the test is done, replace the activity content view with ViewStub so
        // that it's ready to be replaced for the next test.
        final DynamicCoordinatorLayoutActivity activity = mActivityTestRule.getActivity();
        activity.setContentView(R.layout.dynamic_coordinator_layout);
        mCoordinatorLayout = null;
    }

    /**
     * Matches views that have parents.
     */
    private Matcher<View> hasParent() {
        return new TypeSafeMatcher<View>() {
            @Override
            public void describeTo(Description description) {
                description.appendText("has parent");
            }

            @Override
            public boolean matchesSafely(View view) {
                return view.getParent() != null;
            }
        };
    }

    /**
     * Inflates the <code>ViewStub</code> with the passed layout resource.
     */
    protected ViewAction inflateViewStub(final @LayoutRes int layoutResId) {
        return new ViewAction() {
            @Override
            public Matcher<View> getConstraints() {
                return allOf(isAssignableFrom(ViewStub.class), hasParent());
            }

            @Override
            public String getDescription() {
                return "Inflates view stub";
            }

            @Override
            public void perform(UiController uiController, View view) {
                uiController.loopMainThreadUntilIdle();

                ViewStub viewStub = (ViewStub) view;
                viewStub.setLayoutResource(layoutResId);
                viewStub.inflate();

                mCoordinatorLayout = (CoordinatorLayout) mActivityTestRule.getActivity()
                        .findViewById(viewStub.getInflatedId());

                uiController.loopMainThreadUntilIdle();
            }
        };
    }

    protected ViewAction setLayoutDirection(final int layoutDir) {
        return new ViewAction() {
            @Override
            public Matcher<View> getConstraints() {
                return any(View.class);
            }

            @Override
            public String getDescription() {
                return "Sets layout direction";
            }

            @Override
            public void perform(UiController uiController, View view) {
                uiController.loopMainThreadUntilIdle();

                ViewCompat.setLayoutDirection(view, layoutDir);

                uiController.loopMainThreadUntilIdle();
            }
        };
    }
}