DateUtilTest.java

/**
 * Copyright (C) 2013 Johannes Schnatterer
 *
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This file is part of nusic.
 *
 * nusic is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * nusic is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with nusic.  If not, see <http://www.gnu.org/licenses/>.
 */
package info.schnatterer.nusic.util;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

import org.junit.Test;

public final class DateUtilTest {
    public static final int ADD_MINUTES = 42;
    private static final int MILLIS_TO_MINUTES = 1000 * 60;

    @Test
    public void testAddMinutes() {
        long testStartMillis = new Date().getTime();
        long actualTime = DateUtil.addMinutes(ADD_MINUTES).getTime();
        long expectedTime = testStartMillis + (ADD_MINUTES * MILLIS_TO_MINUTES);

        assertTrue("Added time amount is not great enough",
                actualTime >= expectedTime);
    }

    /**
     * Test for {@link DateUtil#midnightUtc(Calendar)} where in UTC it is the
     * 21st of July, but our local date is already 22nd of July (GMT+x).
     */
    @Test
    public void testMidnightUtcPlus() {
        Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("UTC+2"));
        // 2014-07-22T01:44:55+02:00 (UTC+2) equals 2014-07-21T23:44:55Z (UTC).
        cal.set(2014, Calendar.JULY, 22, 1, 44, 55);
        // 2014-07-22T00:00:00Z,
        long expected = 1405987200000l;
        long actual = DateUtil.midnightUtc(cal);
        assertEquals("Unexpected date returned", expected, actual);
        // Don't return 2014-07-21T00:00:00Z
    }

    /**
     * Test for {@link DateUtil#midnightUtc(Calendar)} where in UTC it is the
     * 23rd of July, but our local date still is 22nd of July (GMT-x).
     */
    @Test
    public void testMidnightUtcMinus() {
        Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("UTC-2"));
        // 2014-07-22T23:44:55-02:00 (UTC+2) equals 2014-07-23T01:44:55Z (UTC).
        cal.set(2014, Calendar.JULY, 22, 23, 44, 55);
        // 2014-07-22T00:00:00Z,
        long expected = 1405987200000l;
        long actual = DateUtil.midnightUtc(cal);
        assertEquals("Unexpected date returned", expected, actual);
        // Don't return 2014-07-23T00:00:00Z
    }
}