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An alternative Android testing framework.

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package org.robolectric.shadows;

import org.robolectric.shadow.api.ShadowPicker;

public class LooperShadowPicker implements ShadowPicker {

  private Class legacyShadowClass;
  private Class pausedShadowClass;

  public LooperShadowPicker(
      Class legacyShadowClass, Class pausedShadowClass) {
    this.legacyShadowClass = legacyShadowClass;
    this.pausedShadowClass = pausedShadowClass;
  }

  @Override
  @SuppressWarnings("deprecation") // This is Robolectric library code
  public Class pickShadowClass() {
    switch (ShadowLooper.looperMode()) {
      case LEGACY:
        return legacyShadowClass;
      case PAUSED:
      case INSTRUMENTATION_TEST:
        return pausedShadowClass;
    }
    throw new UnsupportedOperationException("Unrecognized looperMode " + ShadowLooper.looperMode());
  }
}