robolectric/src/test/java/org/robolectric/shadows/ShadowICUTest.java

package org.robolectric.shadows;

import android.os.Build;

import libcore.icu.ICU;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.robolectric.TestRunners;
import org.robolectric.annotation.Config;

import static org.assertj.core.api.Assertions.assertThat;

@RunWith(TestRunners.MultiApiWithDefaults.class)
@Config(sdk = {
    Build.VERSION_CODES.LOLLIPOP })
public class ShadowICUTest {

    @Test
    public void getBestDateTimePattern_returnsReasonableValue() {
        assertThat(ICU.getBestDateTimePattern("hm", null)).isEqualTo("hm");
    }

    @Test
    public void datePickerShouldNotCrashWhenAskingForBestDateTimePattern() {
        ActivityController<DatePickerActivity> activityController = Robolectric.buildActivity(DatePickerActivity.class);
        activityController.setup();
    }

    private static class DatePickerActivity extends Activity {
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            LinearLayout view = new LinearLayout(this);
            view.setId(1);
            DatePicker datePicker = new DatePicker(this);
            view.addView(datePicker);

            setContentView(view);
        }
    }
}