Why should I use Hamcrest-Matcher and assertThat() instead of traditional assertXXX()-Methods

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When I look at the examples in the Assert class JavaDoc

assertThat("Help! Integers don't work", 0, is(1)); // fails:
// failure message:
// Help! Integers don't work
// expected: is <1> 
// got value: <0>
assertThat("Zero is one", 0, is(not(1))) // passes

I dont see a big advantage over, let's say, assertEquals( 0, 1 ).

It's nice maybe for the messages if the constructs get more complicated but do you see more advantages? Readability?

junit4 hamcrest junit testing java
7 Answers

there are advantages to assertThat over assertEquals -
1) more readable
2) more information on failure
3) compile time errors - rather than run time errors
4) flexibility with writing test conditions
5) portable - if you are using hamcrest - you can use jUnit or TestNG as the underlying framework.

user_48201010
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