void fileChanged(String name) {
            changedFiles.add(name)
        }

        void taskInputChanged(String name) {
            changedTask = name
        }

        void gradlePropertyChanged() {
            changedGradleProperty = true
        }

        void systemPropertyChanged(String name) {
            changedSystemProperty = name
        }
    }

        model3[1].message == "It works from project :b"

        and:
        // TODO - should not invalidate all cached state
        fixture.assertStateRecreated {
            gradlePropertyChanged()
            buildModelQueries = 1 // TODO:configuration-cache ???
            projectConfigured(":buildSrc")
            projectsConfigured(":", ":a", ":b", ":c")
            modelsCreated(":a", ":b")
        }