Question

I commonly use Mixins in test code to share utility methods across tests. I have a test that I wrote which has a @TestFor and @Mixin. The behavior that I’m seeing is that when I have the @TestFor annotation the test does not see my @Mixin code and gives me a MissingMethodException when executed. When I remove the @TestFor it works fine. Below is a simplified example of what I’m trying to do.

@Mixin(TagLibTestUtils)
@TestFor(ErrorMessageTagLib)
class ErrorMessageTagLibTests {

    @Test
    void stuff() {
        something()
    }
}

class TagLibTestUtils {

    def something() {
        println ">>> HERE"
    }
}

So my question is do @Mixin and @TestFor annotations not work together? Or am I doing something wrong here?

Answer 1

Assuming you are using Grails 2.0, you should @TestMixin instead of @Mixin.

If you look at the source for the TestFor, you will see this comment:

/**
 * Used to indicate the class under test. Triggers the @TestMixin AST transform for the given artefact type.
 *
 * @author Graeme Rocher
 * @since 2.0
 */