content: /*
   * 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 androidx.test.testing.fixtures;
  
  import org.junit.internal.AssumptionViolatedException;
  import org.junit.internal.runners.model.EachTestNotifier;
  import org.junit.runner.Description;
  import org.junit.runner.Runner;
  import org.junit.runner.notification.RunNotifier;
  import org.junit.runners.model.RunnerBuilder;
  
  /**
   * A custom runner builder used for testing support for specifying custom {@link RunnerBuilder}
   * classes through the runner args.
   */
  public class CustomRunnerBuilder extends RunnerBuilder {
  
    @Override
    public Runner runnerForClass(Class<?> testClass) throws Throwable {
      if (Runnable.class.isAssignableFrom(testClass)) {
        final Runnable runnable = (Runnable) testClass.getDeclaredConstructor().newInstance();
        final Description description = Description.createTestDescription(testClass, "run");
        return new Runner() {
          @Override
          public Description getDescription() {
            return description;
          }
  
          @Override
          public void run(RunNotifier notifier) {
            EachTestNotifier eachNotifier = new EachTestNotifier(notifier, description);
            eachNotifier.fireTestStarted();
            try {
              runnable.run();
            } catch (AssumptionViolatedException e) {
              eachNotifier.addFailedAssumption(e);
            } catch (Throwable e) {
              eachNotifier.addFailure(e);
            } finally {
              eachNotifier.fireTestFinished();
            }
          }
        };
      } else {
        return null;
      }
    }
  }
  