Exploratory test for DateUtils::getRelativeTimeSpanString class from Android SDK.

DateUtilsTest.java

package pl.izmajlowiczl.bsj.delete_me;

import android.text.format.DateUtils;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.robolectric.RobolectricTestRunner;

import java.util.Calendar;
import java.util.Locale;

import static org.junit.Assert.assertEquals;

@RunWith(RobolectricTestRunner.class)
public class DateUtilsTest {

    @Before
    public void setup() {
        Locale.setDefault(Locale.ENGLISH);
    }

    @Test
    public void lessThanOneMinuteAgo() {
        Calendar calendar = Calendar.getInstance();
        long now = calendar.getTimeInMillis();

        calendar.add(Calendar.SECOND, -10);
        long start = calendar.getTimeInMillis();

        final CharSequence string = DateUtils.getRelativeTimeSpanString(
                start, now, DateUtils.MINUTE_IN_MILLIS);

        assertEquals("0 minutes ago", string);
    }

    @Test
    public void moreThanOneMinuteAfter() {
        Calendar calendar = Calendar.getInstance();
        long now = calendar.getTimeInMillis();

        calendar.add(Calendar.SECOND, 10);
        long start = calendar.getTimeInMillis();

        final CharSequence string = DateUtils.getRelativeTimeSpanString(
                start, now, DateUtils.MINUTE_IN_MILLIS);

        assertEquals("in 0 minutes", string);
    }

    @Test
    public void oneMinuteAgo() {
        Calendar calendar = Calendar.getInstance();
        long now = calendar.getTimeInMillis();

        calendar.add(Calendar.MINUTE, -1);
        long start = calendar.getTimeInMillis();

        final CharSequence string = DateUtils.getRelativeTimeSpanString(
                start, now, DateUtils.MINUTE_IN_MILLIS);

        assertEquals("1 minute ago", string);
    }

    @Test
    public void oneMinuteAfter() {
        Calendar calendar = Calendar.getInstance();
        long now = calendar.getTimeInMillis();

        calendar.add(Calendar.MINUTE, 1);
        long start = calendar.getTimeInMillis();

        final CharSequence string = DateUtils.getRelativeTimeSpanString(
                start, now, DateUtils.MINUTE_IN_MILLIS);

        assertEquals("in 1 minute", string);
    }

    @Test
    public void betweenMinuteAndHourInPast() {
        Calendar calendar = Calendar.getInstance();
        long now = calendar.getTimeInMillis();

        calendar.add(Calendar.MINUTE, -10);
        long start = calendar.getTimeInMillis();

        final CharSequence string = DateUtils.getRelativeTimeSpanString(
                start, now, DateUtils.MINUTE_IN_MILLIS);

        assertEquals("10 minutes ago", string);
    }

    @Test
    public void betweenMinuteAndHourInFuture() {
        Calendar calendar = Calendar.getInstance();
        long now = calendar.getTimeInMillis();

        calendar.add(Calendar.MINUTE, 10);
        long start = calendar.getTimeInMillis();

        final CharSequence string = DateUtils.getRelativeTimeSpanString(
                start, now, DateUtils.MINUTE_IN_MILLIS);

        assertEquals("in 10 minutes", string);
    }

    @Test
    public void betweenHourAndWeekInPast() {
        Calendar calendar = Calendar.getInstance();
        long now = calendar.getTimeInMillis();

        calendar.add(Calendar.DAY_OF_WEEK, -2);
        long start = calendar.getTimeInMillis();

        final CharSequence string = DateUtils.getRelativeTimeSpanString(
                start, now, DateUtils.MINUTE_IN_MILLIS);

        assertEquals("2 days ago", string);
    }

    @Test
    public void betweenHourAndWeekInFuture() {
        Calendar calendar = Calendar.getInstance();
        long now = calendar.getTimeInMillis();

        calendar.add(Calendar.DAY_OF_WEEK, 2);
        long start = calendar.getTimeInMillis();

        final CharSequence string = DateUtils.getRelativeTimeSpanString(
                start, now, DateUtils.MINUTE_IN_MILLIS);

        assertEquals("in 2 days", string);
    }

    @Test
    public void oneWeekInPast() {
        Calendar calendar = Calendar.getInstance();
        long now = calendar.getTimeInMillis();

        calendar.add(Calendar.WEEK_OF_MONTH, -1);
        long start = calendar.getTimeInMillis();

        final CharSequence string = DateUtils.getRelativeTimeSpanString(
                start, now, DateUtils.MINUTE_IN_MILLIS);

        assertEquals("7 days ago", string);
    }

    @Test
    public void oneWeekInFuture() {
        Calendar calendar = Calendar.getInstance();
        long now = calendar.getTimeInMillis();

        calendar.add(Calendar.WEEK_OF_MONTH, 1);
        long start = calendar.getTimeInMillis();

        final CharSequence string = DateUtils.getRelativeTimeSpanString(
                start, now, DateUtils.MINUTE_IN_MILLIS);

        assertEquals("Apr 5, 2015", string);
    }

    @Test
    public void moreThanWeekInPast() {
        Calendar calendar = Calendar.getInstance();
        calendar.set(2015, 3, 29, 23, 1, 2);
        long now = calendar.getTimeInMillis();

        calendar.add(Calendar.WEEK_OF_MONTH, -2);
        long start = calendar.getTimeInMillis();

        final CharSequence string = DateUtils.getRelativeTimeSpanString(
                start, now, DateUtils.MINUTE_IN_MILLIS);

        assertEquals("Apr 15, 2015", string);
    }

    @Test
    public void moreThanWeekInFuture() {
        Calendar calendar = Calendar.getInstance();
        calendar.set(2015, 3, 10, 23, 1, 2);
        long now = calendar.getTimeInMillis();

        calendar.add(Calendar.WEEK_OF_MONTH, 2);
        long start = calendar.getTimeInMillis();

        final CharSequence string = DateUtils.getRelativeTimeSpanString(
                start, now, DateUtils.MINUTE_IN_MILLIS);

        assertEquals("Apr 24, 2015", string);
    }
}