mode = 0753
            file('reference.txt').mode = 0762
        }
        def archName = "test.${taskName.toLowerCase()}"
        testDir.usingNativeTools()."$packMethod"(file(archName))
        and:
        buildFile << """
            task unpack(type: Copy) {
                from $treeMethod("$archName")
                into 'unpacked'
            }
            """