Hamcrest number comparison using between

Question

Is there a way in Hamcrest to compare a number within a number range? I am looking for something like this:

assertThat(50L, is(between(12L, 1658L)));

score 102 · Accepted Answer · answered Oct 08 '12 at 16:50

102

An alternative to Jeff's solution is to use both:

assertThat(50L, is(both(greaterThan(12L)).and(lessThan(1658L))));

I think that's quite readable. You also get a good error message in case the check failed:

Expected: is (a value greater than <50L> and a value less than <1658L>) got: <50L>

answered Oct 08 '12 at 16:50

Christoph Leiter

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I didn't find the import for _both_ statement. Can someone help? – Leonel Sanches da Silva Jun 20 '13 at 19:44
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@CiganoMorrisonMendez It's in org.hamcrest.CoreMatchers – Christoph Leiter Jun 21 '13 at 09:34
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Thanks. It was not appearing for me because LambdaJ uses hamcrest-all-1.1, which doesn't have this implementation. I've found it at version 1.2 or above. – Leonel Sanches da Silva Jun 21 '13 at 18:18
This also works well with java.util.Date comparisons since Date implements Comparable – GameSalutes Aug 21 '17 at 21:07

score 26 · Answer 2 · answered Oct 08 '12 at 14:57

I don't believe between is part of the core hamcrest matchers, but you could do something like this:

assertThat(number, allOf(greaterThan(min),lessThan(max)));

That's still a little ugly, so you could create a helper method between

assertThat(number, between(min,max))

and between looks like

allOf(greaterThan(min),lessThan(max))

Still not a fantastic solution, but it reads like a hamcrest matcher.

If you can't find one that's publicly available, it would be trivial to write your own between matcher http://code.google.com/p/hamcrest/wiki/Tutorial.

score 17 · Answer 3 · edited Mar 17 '14 at 12:03

17

If you're dealing with integers, you should consider using the closeTo method:

assertThat((double)nclient, is(closeTo(nserver, 1d)));

unfortunately, there's no closeTo for integers, but every 32 bit integer is representable by a double, so you can simply cast them to doubles, and carry on.

This is not exactly equivalent to between, but can sometimes be helpful.

edited Mar 17 '14 at 12:03

Anders R. Bystrup

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answered Sep 09 '13 at 09:42

Elazar Leibovich

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JeanValjean · Answer 4 · 2016-03-16T21:11:29.193

Another option is to use the Cirneco extension. It has between(), betweenInclusive() and more. These matchers also apply to other objects that implements Comparable (like Date).

Following your example, it will be:

assertThat(50L, between(12L, 1658L));

and if you want the two bounds to be included:

assertThat(50L, betweenIncluded(12L, 1658L));

or if you want just one of the bounds to be included:

assertThat(50L, betweenLowerBoundIncluded(12L, 1658L));  
assertThat(50L, betweenUpperBoundIncluded(12L, 1658L));

You can use the following dependency for a JDK7-compliant project:

<dependency>
  <groupId>it.ozimov</groupId>
  <artifactId>java7-hamcrest-matchers</artifactId>
  <version>0.7.0</version>
</dependency>

or the following if you are using JDK8

<dependency>
  <groupId>it.ozimov</groupId>
  <artifactId>java8-hamcrest-matchers</artifactId>
  <version>0.7.0</version>
</dependency>

Hamcrest number comparison using between

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