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An alternative Android testing framework.

There is a newer version: 4.14

package org.robolectric.shadows;

import static android.os.Build.VERSION_CODES.JELLY_BEAN_MR2;
import static android.os.Build.VERSION_CODES.KITKAT_WATCH;
import static android.os.Build.VERSION_CODES.LOLLIPOP;
import static android.os.Build.VERSION_CODES.N;

import android.icu.util.ULocale;
import java.util.Locale;
import org.robolectric.RuntimeEnvironment;
import org.robolectric.annotation.Implementation;
import org.robolectric.annotation.Implements;

@Implements(value = libcore.icu.ICU.class, isInAndroidSdk = false)
public class ShadowICU {

  @Implementation
  public static String addLikelySubtags(String locale) {
    if (RuntimeEnvironment.getApiLevel() >= N) {
      return ULocale.addLikelySubtags(ULocale.forLanguageTag(locale)).toLanguageTag();
    } else {
      // Return what is essentially the given locale, normalized by passing through the Locale
      // factory method.
      return Locale.forLanguageTag(locale).toLanguageTag();
    }
  }

  @Implementation(minSdk = LOLLIPOP)
  public static String getBestDateTimePattern(String skeleton, Locale locale) {
    switch (skeleton) {
      case "jmm":
        return getjmmPattern(locale);
      default:
        return skeleton;
    }
  }

  @Implementation(minSdk = JELLY_BEAN_MR2, maxSdk = KITKAT_WATCH)
  public static String getBestDateTimePattern(String skeleton, String locale) {
    return skeleton;
  }

  private static String getjmmPattern(Locale locale) {
    if (locale.equals(new Locale("pt", "BR")) || locale.equals(Locale.UK)) {
      return "H:mm";
    }
    return "h:mm a";
  }
}