File(dir, "src/crossVersionTest").isDirectory,
                    "${it.name}'s crossVersionTests is wrong!",
                )
            }
    }

    @Test
    fun allSubprojectsDefineTheirUnitTestPropertyCorrectly() {
        val projectDirsWithUnitTests =
            model.subprojects.subprojects
                .filter { it.unitTests }
                .map { File("..", it.path) }