Tag Archives: Java 8

Verifying DateTime and Date with Hamcrest

twittergoogle_plusrss

Facebooktwittergoogle_plusredditlinkedinmail

Since I started diving into automated testing and practicing TDD, verification of date values was pain. Luckily there is nice library for legacy Date and new Java 8 DateTime APIs, which cures this pain.

If you belong to healthier part of Java development community and practicing unit testing on daily basis, you probably are aware of Hamcrest Java library. It can make your tests much more readable. It’s architecture is very modular and is used by various other testing libraries.

Major part of it’s flexibility is it concept of Matcher. I am not going to dive into this concept now. If you are not familiar, just take a quick look at Hamcrest tutorial. One of the matcher you can plug into your testing toolbox is library hamcrest-date. With this library we can easily test that date was generated within certain range:

    @Test
    public void validateDate() {
        //GIVEN
        Date expectedDate = new Date();

        //WHEN
        Date actualDate = new Date();

        //THEN
        assertThat(actualDate, DateMatchers.within(2, ChronoUnit.SECONDS, expectedDate));
    }

We can do that also for Java 8 types:

    @Test
    public void validateDateTime() {
        //GIVEN
        LocalDateTime expectedDateTime = LocalDateTime.now();

        //WHEN
        LocalDateTime actualDateTime = LocalDateTime.now();

        //THEN
        assertThat(actualDateTime, LocalDateTimeMatchers.within(2, ChronoUnit.SECONDS, expectedDateTime));
    }

Or pick various exotic verifications hamcrest-core library provides:

    @Test
    public void validateZonedDateTime() {
        //GIVEN
        ZonedDateTime expectedDateTime = ZonedDateTime.of(2016, 3, 20, 13, 3, 0, 0, ZoneId.of("GMT+1"));

        //WHEN
        ZonedDateTime actualDateTime = ZonedDateTime.of(2016, 3, 20, 13, 3, 0, 0, ZoneId.of("GMT-0"));

        //THEN
        assertThat(actualDateTime, ZonedDateTimeMatchers.sameDay(expectedDateTime));
        assertThat(actualDateTime, ZonedDateTimeMatchers.after(expectedDateTime));
        assertThat(actualDateTime, ZonedDateTimeMatchers.isSunday());
        assertThat(actualDateTime, ZonedDateTimeMatchers.isMarch());
    }

Kudos to creator for this nice little library. This example is hosted in Github.

twittergoogle_plusrss

Eclipse Kepler + Java 8: Syntax error, annotations are only available if source level is 1.5 or greater

twittergoogle_plusrss

Facebooktwittergoogle_plusredditlinkedinmail

When I configured project with Spring, Maven and Java 8, my Eclipse showed a lot of errors. I noticed mostly refusing to accept annotations:

Syntax error, annotations are only available if source level is 1.5 or greater.

Eclipse Kepler doesn’t have built in support for JDK8. So there is needed to install JDT with Java8 support.

I use Spring Tools Suite 3.5.0.RELEASE, which  is still based on Eclipse Kepler (4.3.2). That is why STS needs this update.

twittergoogle_plusrss