Junit: less-than assertion?

Question

Is there anything like assertThat(a, lessThan(b)); ? I'm currently using Junit 4.8.1 and I haven't been able to find lessThan. Instead I have to do assertTrue(a < b), but this has a drawback that it doesn't print two numbers in test log.

It doesn't look like it. But you could easily write your own that provides a useful message... — Oliver Charlesworth, Mar 10 '13 at 23:48

score 11 · Accepted Answer · answered Mar 10 '13 at 23:54

11

Have you tried JUnit + Hamcrest? See this blog post for some examples—it looks almost exactly like what you posted:

JUnit 4 Showcase – assertThat and Hamcrest Matchers

Alternatively, there's also ComparableAssert from the JUnit-addons project.

answered Mar 10 '13 at 23:54

DaoWen

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I checked Hamcrest, and there was nothing like the lessThan function – Shuo Mar 11 '13 at 01:37
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It's in the docs: http://hamcrest.org/JavaHamcrest/javadoc/1.3/org/hamcrest/number/OrderingComparison.html#lessThan(T) – DaoWen Mar 11 '13 at 03:50
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Or, if you go through `Matchers` to see everything that's available, as [`Matchers.lessThan`](http://hamcrest.org/JavaHamcrest/javadoc/1.3/org/hamcrest/Matchers.html#lessThan%28T%29). – Joe Mar 11 '13 at 11:26
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the `Matchers` class doesn't seem to come with the *Hamcrest* that *Junit* uses. Adding **Hamcrest-library**, as an additional dependency, got the me the necessary `Matchers` class. – Raystorm Feb 26 '14 at 01:02

score 3 · Answer 2 · answered Dec 09 '14 at 17:24

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You can import Hamcrest like this and use the Matchers.lessThan() method.

import static org.junit.Assert.*;
import static org.hamcrest.CoreMatchers.*;

assertThat(foo, Matchers.lessThan(bar));

answered Dec 09 '14 at 17:24

user2601995

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Junit: less-than assertion?

2 Answers2