content: /*
   * 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 androidx.test.internal.runner.junit4;
  
  import android.util.Log;
  import androidx.test.internal.runner.EmptyTestRunner;
  import androidx.test.internal.util.AndroidRunnerParams;
  import java.lang.reflect.Method;
  import org.junit.Test;
  import org.junit.internal.builders.JUnit4Builder;
  import org.junit.runner.Runner;
  import org.junit.runners.model.RunnerBuilder;
  
  /**
   * A {@link RunnerBuilder} that will build customized runners needed to handle the ability to skip
   * test execution if needed.
   */
  public class AndroidJUnit4Builder extends JUnit4Builder {
  
    private static final String TAG = "AndroidJUnit4Builder";
    private final long perTestTimeout;
  
    /**
     * @param runnerParams {@link AndroidRunnerParams} that stores common runner parameters
     * @deprecated use {@link AndroidJUnit4Builder()} instead
     */
    @Deprecated
    public AndroidJUnit4Builder(AndroidRunnerParams runnerParams) {
      this(runnerParams.getPerTestTimeout());
    }
  
    public AndroidJUnit4Builder(long perTestTimeout) {
      this.perTestTimeout = perTestTimeout;
    }
  
    @Override
    public Runner runnerForClass(Class<?> testClass) throws Throwable {
      try {
        if (!hasTestMethods(testClass)) {
          // if we can't find any test methods, see if it's due to something with a custom classloader
          if (testClass.getClassLoader() != Test.class.getClassLoader()) {
            // ClassLoader#findClass(module, name) not available in Android
            Class<?> clazz;
            try {
              clazz = Class.forName("org.junit.Test", false, testClass.getClassLoader());
            } catch (Throwable e) {
              clazz = Test.class;
            }
  
            if (!clazz.equals(Test.class)) {
              return new EmptyTestRunner(
                  testClass,
                  new IllegalStateException(
                      "org.junit.Test in custom classloader "
                          + testClass.getClassLoader()
                          + " differs from org.junit.Test in the JUnit"
                          + " runner's classloader. This causes JUnit to not be able to find the"
                          + " tests to run."));
            }
          }
  
          // return a special error runner if there are no @Test methods. This error runner will be
          // ignored when classpath scanning
          return new EmptyTestRunner(testClass);
        }
  
        return new AndroidJUnit4ClassRunner(testClass, perTestTimeout);
      } catch (Throwable e) {
        // log error message including stack trace before throwing to help with debugging.
        Log.e(TAG, "Error constructing runner", e);
        throw e;
      }
    }
  
    private static boolean hasTestMethods(Class<?> testClass) {
      boolean hasTestMethods = false;
      try {
        for (Method testMethod : testClass.getMethods()) {
          if (testMethod.isAnnotationPresent(org.junit.Test.class)) {
            hasTestMethods = true;
            break;
          }
        }
      } catch (Throwable t) {
        // Defensively catch everything - Will throw runtime exception if it cannot
        // load methods.
        //
        // For earlier versions of Android (Pre-ICS), Dalvik might try to initialize a class
        // during getMethods(), fail to do so, hide the error and throw a NoSuchMethodException.
        // Since the java.lang.Class.getMethods does not declare such an exception, resort to a
        // generic catch all.
        // For ICS+, Dalvik will throw a NoClassDefFoundException.
        Log.w(TAG, String.format("%s in hasTestMethods for %s", t.toString(), testClass.getName()));
        return false;
      }
  
      return hasTestMethods;
    }
  }
  