uuid, _ := uuid2.NewRandom()
	for _, drive := range fsDirs {
		dir := path.Join(drive, bucket, object, uuid.String())
		err = os.MkdirAll(dir, os.ModePerm)
		if err != nil {
			t.Fatal(err)
		}
		err = os.WriteFile(pathJoin(dir, "part.1"), []byte("some data"), os.ModePerm)
		if err != nil {
			t.Fatal(err)
		}
	}

	// This should remove all the unreferenced parts.

	if err := os.MkdirAll(path, 0750); err != nil {
		t.Fatalf("error creating test dir: %v", err)
	}
}

func writeTestFile(t *testing.T, path string, contents string) {
	if err := os.WriteFile(path, []byte(contents), 0644); err != nil {
		t.Fatalf("error creating test file %#v", err)
	}
}

func TestFilenameOptionsValidate(t *testing.T) {
	testcases := []struct {
		filenames []string

		// The corresponding Go symbol is:
		// _cgoexp_hashcode_symname.
		name := strings.SplitN(extname, "_", 4)[3]

		buf.Write([]byte(name + "\n"))
	}

	err := os.WriteFile(fname, buf.Bytes(), 0666)
	if err != nil {
		Errorf(nil, "WriteFile %s failed: %v", fname, err)
	}

	return fname

		if err != nil {
			t.Fatal(err)
		}
		old := data
		data = append(data, fmt.Sprintf("var DummyUnusedVar%d bool\n", idx)...)
		if err := os.WriteFile(name, append(data, '\n'), 0666); err != nil {
			t.Fatal(err)
		}
		tg.sleep()
		return func() {
			if err := os.WriteFile(name, old, 0666); err != nil {
				t.Fatal(err)
			}
		}
	}

	// Every main package depends on the "runtime".

				}
			}
			dir := filepath.Dir(tc.deviceMountPath)
			// Make JSON for this object
			if tc.jsonFile != "" {
				dataPath := filepath.Join(dir, volDataFileName)
				if err := os.WriteFile(dataPath, []byte(tc.jsonFile), 0644); err != nil {
					t.Fatalf("error creating %s: %s", dataPath, err)
				}
			}
			if tc.createPV {
				// Make the PV for this object
				pvName := filepath.Base(dir)

	}

	if !conf.forceUpdateConf(&resolvConf, time.Now().Add(time.Hour)) {
		t.Fatal("failed to update resolv config")
	}

	tmpFile := filepath.Join(t.TempDir(), "hosts")
	if err := os.WriteFile(tmpFile, []byte{}, 0660); err != nil {
		t.Fatal(err)
	}
	hostsFilePath = tmpFile

	const testName = "test.invalid"

	order, _ := systemConf().hostLookupOrder(DefaultResolver, testName)

// WriteWorkFile cleans and writes out the go.work file to the given path.
func WriteWorkFile(path string, wf *modfile.WorkFile) error {
	wf.SortBlocks()
	wf.Cleanup()
	out := modfile.Format(wf.Syntax)

	return os.WriteFile(path, out, 0666)
}

// UpdateWorkGoVersion updates the go line in wf to be at least goVers,
// reporting whether it changed the file.
func UpdateWorkGoVersion(wf *modfile.WorkFile, goVers string) (changed bool) {

		// See runtime/unsafepoint_test.go.
		pmain.Internal.OmitDebug = false
	}

	if !cfg.BuildN {
		// writeTestmain writes _testmain.go,
		// using the test description gathered in t.
		if err := os.WriteFile(testDir+"_testmain.go", *pmain.Internal.TestmainGo, 0666); err != nil {
			return nil, nil, nil, err
		}
	}

	// Set compile objdir to testDir we've already created,

	if err != nil {
		return
	}
	err = en.WriteTime(z.StartTime)
	if err != nil {
		err = msgp.WrapError(err, "StartTime")
		return
	}
	// write "EndTime"
	err = en.Append(0xa7, 0x45, 0x6e, 0x64, 0x54, 0x69, 0x6d, 0x65)
	if err != nil {
		return
	}
	err = en.WriteTime(z.EndTime)
	if err != nil {
		err = msgp.WrapError(err, "EndTime")
		return
	}

	rfw := &readFromWriter{}
	w := NewWriterSize(rfw, bufsize)

	const writeSize = 8
	if n, err := w.Write(input[:writeSize]); n != writeSize || err != nil {
		t.Errorf("w.Write(%v bytes) = %v, %v; want %v, nil", writeSize, n, err, writeSize)
	}
	n, err := w.ReadFrom(bytes.NewReader(input[writeSize:]))
	if wantn := len(input[writeSize:]); int(n) != wantn || err != nil {