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An alternative Android testing framework.
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package org.robolectric;

import android.app.Application;
import android.content.pm.PackageManager;

import org.robolectric.res.ResourceTable;
import org.robolectric.res.builder.RobolectricPackageManager;
import org.robolectric.util.Scheduler;

import static android.os.Build.VERSION_CODES.LOLLIPOP;

public class RuntimeEnvironment {
  public static Application application;

  private volatile static Thread mainThread = Thread.currentThread();
  private static String qualifiers;
  private static Object activityThread;
  private static RobolectricPackageManager packageManager;
  private static int apiLevel;
  private static Scheduler masterScheduler;
  private static ResourceTable systemResourceTable;
  private static ResourceTable appResourceTable;
  private static ResourceTable compileTimeResourceTable;

  /**
   * Tests if the given thread is currently set as the main thread.
   *
   * @param thread the thread to test.
   * @return true if the specified thread is the main thread, false otherwise.
   * @see #isMainThread()
   */
  public static boolean isMainThread(Thread thread) {
    return thread == mainThread;
  }

  /**
   * Tests if the current thread is currently set as the main thread.
   *
   * @return true if the current thread is the main thread, false otherwise.
   */
  public static boolean isMainThread() {
    return isMainThread(Thread.currentThread());
  }

  /**
   * Retrieves the main thread. The main thread is the thread to which the main looper is attached.
   * Defaults to the thread that initialises the RuntimeEnvironment class.
   *
   * @return The main thread.
   * @see #setMainThread(Thread)
   * @see #isMainThread()
   */
  public static Thread getMainThread() {
    return mainThread;
  }

  /**
   * Sets the main thread. The main thread is the thread to which the main looper is attached.
   * Defaults to the thread that initialises the RuntimeEnvironment class.
   *
   * @param newMainThread the new main thread.
   * @see #setMainThread(Thread)
   * @see #isMainThread()
   */
  public static void setMainThread(Thread newMainThread) {
    mainThread = newMainThread;
  }

  public static Object getActivityThread() {
    return activityThread;
  }

  public static void setActivityThread(Object newActivityThread) {
    activityThread = newActivityThread;
  }

  public static PackageManager getPackageManager() {
    return (PackageManager) packageManager;
  }

  public static RobolectricPackageManager getRobolectricPackageManager() {
    return packageManager;
  }

  public static void setRobolectricPackageManager(RobolectricPackageManager newPackageManager) {
    if (packageManager != null) {
      packageManager.reset();
    }
    packageManager = newPackageManager;
  }

  public static String getQualifiers() {
    return qualifiers;
  }

  public static void setQualifiers(String newQualifiers) {
    qualifiers = newQualifiers;
  }

  public static int getApiLevel() {
    return apiLevel;
  }

  public static Number castNativePtr(long ptr) {
    // Weird, using a ternary here doesn't work, there's some auto promotion of boxed types happening.
    if (getApiLevel() >= LOLLIPOP) {
      return ptr;
    } else {
      return (int) ptr;
    }
  }

  /**
   * Retrieves the current master scheduler. This scheduler is always used by the main
   * {@link android.os.Looper Looper}, and if the global scheduler option is set it is also used for
   * the background scheduler and for all other {@link android.os.Looper Looper}s
   * @return The current master scheduler.
   * @see #setMasterScheduler(Scheduler)
   * see org.robolectric.Robolectric#getForegroundThreadScheduler()
   * see org.robolectric.Robolectric#getBackgroundThreadScheduler()
   */
  public static Scheduler getMasterScheduler() {
    return masterScheduler;
  }

  /**
   * Sets the current master scheduler. See {@link #getMasterScheduler()} for details.
   * Note that this method is primarily intended to be called by the Robolectric core setup code.
   * Changing the master scheduler during a test will have unpredictable results.
   * @param masterScheduler the new master scheduler.
   * @see #getMasterScheduler()
   * see org.robolectric.Robolectric#getForegroundThreadScheduler()
   * see org.robolectric.Robolectric#getBackgroundThreadScheduler()
   */
  public static void setMasterScheduler(Scheduler masterScheduler) {
    RuntimeEnvironment.masterScheduler = masterScheduler;
  }

  public static void setSystemResourceTable(ResourceTable systemResourceTable) {
    RuntimeEnvironment.systemResourceTable = systemResourceTable;
  }

  public static void setAppResourceTable(ResourceTable appResourceTable) {
    RuntimeEnvironment.appResourceTable = appResourceTable;
  }

  public static ResourceTable getSystemResourceTable() {
    return systemResourceTable;
  }

  public static ResourceTable getAppResourceTable() {
    return appResourceTable;
  }

  public static void setCompileTimeResourceTable(ResourceTable compileTimeResourceTable) {
    RuntimeEnvironment.compileTimeResourceTable = compileTimeResourceTable;
  }

  public static ResourceTable getCompileTimeResourceTable() {
    return compileTimeResourceTable;
  }
}