log.Fatal("expected error emitting counter data to bad dir")
	} else {
		got := fmt.Sprintf("%v", err)
		checkWant("counter data", got)
	}
}

func emitToUnwritableDir() {
	log.SetPrefix("emitToUnwritableDir: ")

	want := "permission denied"

	if err := coverage.WriteMetaDir(*outdirflag); err == nil {
		log.Fatal("expected error from WriteMetaDir to unwritable dir")
	} else {

		upmergeCoverData(t, rdir, "atomic")
	})
}

func testEmitToUnwritableDir(t *testing.T, harnessPath string, dir string) {
	withAndWithoutRunner(func(setGoCoverDir bool, tag string) {

		tp := "emitToUnwritableDir"
		rdir, edir := mktestdirs(t, tag, tp, dir)

		// Make edir unwritable.
		if err := os.Chmod(edir, 0555); err != nil {
			t.Fatalf("chmod failed: %v", err)
		}
		defer os.Chmod(edir, 0777)