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Hamcrest
Posted by tomwhite on December 22, 2006 at 12:27 PM | Comments (5)
In Literate Programming with jMock
I enthused about jMock's idea of constraints and flexible assertions.
Now the jMock team has released version 1.0 of Hamcrest,
the constraints part of jMock.
Hamcrest matchers (what were called constraints in jMock) are actually useful for more than just writing unit tests,
but it is their application in writing assertions
where they really shine and will probably see most use.
So now I can write
assertThat(a, equalTo(b))
or even
assertThat(a, is(equalTo(b)))
rather than JUnit's
assertEquals(b, a)
Apart from being more readable, assertThat takes any matcher as the second argument, so
I can combine matchers or even write my own
rather than creating an ever growing listof assertXxx methods. For example, I can say such things as
assertThat(collection, hasItem(anyOf(is(item1), is(item2))));
And since the matchers (and the assertThat method) are accessed using static imports,
I can use them in any test framework I like.
So why not read the tutorial
and give Hamcrest a go?
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Comments
Comments are listed in date ascending order (oldest first) | Post Comment
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doesnt work with code completion.
Posted by: colt_nz on December 22, 2006 at 02:20 PM
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There's a wider problem here with code completion for static imports: supporting completion for all accessible (and not yet implemented) members is expensive. There's a proposal for Eclipse so users can have a list of their favorite static imports, but until this is available you have to manually add the following two imports to get completion:
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.*;
You could set up a template for unit tests to make this go a bit quicker.
(I don't know how others IDEs compare.)
Tom
Posted by: tomwhite on December 23, 2006 at 01:20 PM
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Dear Tom,
I've been working on a similar idea (thanks to Nat Pryce) for TestNG-Abbot ( http://code.google.com/p/testng-abbot/ ). Just yesterday I checked in the package 'org.testng.abbot.assertions.Assert' ( http://testng-abbot.googlecode.com/svn/trunk/testng-abbot/src/java/org/testng/abbot/assertions/ ) that will let you do this:
assertThat(a).isEqualTo(b)
Which IMHO reads better, requires only one static import and is "autocomplete"-friendly. I will appreciate your feedback :)
Alex.
Posted by: alruiz15 on December 28, 2006 at 07:29 AM
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(Same comment, just better formatting) :)
Dear Tom, I've been working on a similar idea (thanks to Nat Pryce) for TestNG-Abbot. Just yesterday I checked in the package org.testng.abbot.assertions.Assert that will let you do this:
assertThat(a).isEqualTo(b)
Which IMHO reads better, requires only one static import and is "autocomplete"-friendly.
I will appreciate your feedback :)
Alex.
Posted by: alruiz15 on December 28, 2006 at 09:18 AM
-
I've been working on a similar idea (thanks to Nat Pryce) for TestNG-Abbot ( http://code.google.com/p/testng-abbot/ ). Just yesterday I checked in the package 'org.testng.abbot.assertions.Assert' ( http://testng-abbot.googlecode.com/svn/trunk/testng-abbot/src/java/org/testng/abbot/assertions/ ) that will let you do this: assertThat(a).isEqualTo(b) Which IMHO reads better, requires only one static import and is "autocomplete"-friendly. I will appreciate your feedback :) Alex
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