func (s *MySuite) Test_BuilderId(c *C) { a := packer.MockArtifact{BuilderIdValue: "bla"} sut := PostProcessor{} _, _, err := sut.PostProcess(testUi(c), &a) c.Assert(err, NotNil) c.Assert(strings.Contains(err.Error(), "Can only import from Azure builder"), Equals, true) a.BuilderIdValue = azure.BuilderId _, _, err = sut.PostProcess(testUi(c), &a) c.Assert(err, NotNil) c.Assert(strings.Contains(err.Error(), "Can only import from Azure builder"), Equals, false) }