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This is the code:
Map<Foo, String> map;
org.hamcrest.MatcherAssert.assertThat(map,
org.hamcrest.Matchers.hasKey(new Foo()));
This is what compiler is saying:
cannot find symbol method assertThat(java.util.Map<Foo,java.lang.String>,
org.hamcrest.Matcher<java.util.Map<Foo,java.lang.Object>>)
Why and what can I do?
992
Including HamcrestRight click on your eclipse project and select 'Properties' and then select 'Java Build Path' in the left pane and 'Libraries' on the right. On the 'Libraries' tab click the 'Add External Jars' button and navigate to the hamcrest-all jar you previously downloaded.
Hamcrest can also be used with mock objects frameworks by using adaptors to bridge from the mock objects framework's concept of a matcher to a Hamcrest matcher. For example, JMock 1's constraints are Hamcrest's matchers. Hamcrest provides a JMock 1 adaptor to allow you to use Hamcrest matchers in your JMock 1 tests.
How to add hamcrest methods into your project by IntelliJ as shown below. For example, we are writing a JUnit test with hamcrest “Is” method. First, click “assertThat” and then press alt+Enter then click “Static Import Method…” Then click “is” and press alt+enter and select “Static Import Method…”
I suspect you need something like:
MatcherAssert.assertThat(map, Matchers.<Foo, String>hasKey());
That way you can specify the value type for the hasKey method call. Looks butt-ugly though, and I'm slightly surprised that type inference doesn't help you...
175
It sounds like you've hit the same bug that I did. Is this in Hamcrest > 1.1? They changed the generics on their matchers between 1.1 and 1.2. I filed a Hamcrest bug here: http://code.google.com/p/hamcrest/issues/detail?id=143
but it turns out that this is actually a bug in the compiler which can't be fixed in JDK 6 but is already fixed in 7: http://bugs.sun.com/bugdatabase/view_bug.do;jsessionid=72ce99618021685c3570069c8f60b?bug_id=7034548
As Jon mentioned, there are a couple of ways to work around it, but they all break the nice, fluent interface of Hamcrest.
37
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