icu/android_icu4j/runner/src/main/java/android/icu/junit/IcuTestRunnerBuilder.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.icu.junit;

import android.icu.dev.test.TestFmwk;
import android.support.test.internal.util.AndroidRunnerParams;
import org.junit.internal.builders.AnnotatedBuilder;
import org.junit.runner.Runner;
import org.junit.runners.model.RunnerBuilder;

/**
 * A {@link RunnerBuilder} used for running ICU test classes derived from {@link TestFmwk}.
 */
public class IcuTestRunnerBuilder extends RunnerBuilder {

    private final AndroidRunnerParams runnerParams;

    private final AnnotatedBuilder annotatedBuilder;

    public IcuTestRunnerBuilder(AndroidRunnerParams runnerParams) {
        this.runnerParams = runnerParams;
        annotatedBuilder = new AnnotatedBuilder(this);
    }

    @Override
    public Runner runnerForClass(Class<?> testClass) throws Throwable {
        // Check for a TestGroup before a TestFmwk class as TestGroup is a subclass of TestFmwk
        if (TestFmwk.TestGroup.class.isAssignableFrom(testClass)) {
            return new IcuTestGroupRunner(testClass.asSubclass(TestFmwk.TestGroup.class), this);
        }

        if (TestFmwk.class.isAssignableFrom(testClass)) {
            // Make sure that in the event of an error the resulting Runner an be filtered out.
            return new IcuTestFmwkRunner(testClass.asSubclass(TestFmwk.class), runnerParams);
        }

        // Fallback to using the annotation builder to support the extra icu cts tests.
        return annotatedBuilder.safeRunnerForClass(testClass);
    }
}