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above are taken care of. Notice the projectArtifact element above with the implementation="" attribute. This is how you will inject the StubArtifact implementation into that projectArtifact private variable on the mojo. Additional elements can be inserted as child elements and they will in turn be assigned to the variables inside that object. An example would be setting the groupId variable on the StubMavenProject. Note: these internal variable might also need implementation="" attributes.

things to watch out for

I have noticed that since the declaration of the patchs are not directly in the same location as the verification (one being with the plugin configuration and the other in the assert clauses) that it is very easy to get them mixed up. And if you are validating that the file doesn't exist at the end of the operation as with the clean plugin, if you are not testing the absolute right thing then your assert will be working when the test itself might have failed. So make sure you check these conditions, perhaps even asserting something is there before the mojo execution and then asserting it isn't there at the end.