// The contents of fsys must not change concurrently with TestFS.
//
// If TestFS finds any misbehaviors, it returns either the first error or a
// list of errors. Use [errors.Is] or [errors.As] to inspect.
//
// Typical usage inside a test is:
//
//	if err := fstest.TestFS(myFS, "file/that/should/be/present"); err != nil {
//		t.Fatal(err)
//	}
func TestFS(fsys fs.FS, expected ...string) error {

	if err := os.Symlink(filepath.Join(tmp, "hello"), filepath.Join(tmp, "hello.link")); err != nil {
		t.Fatal(err)
	}

	if err := TestFS(tmpfs, "hello", "hello.link"); err != nil {
		t.Fatal(err)
	}
}

func TestDash(t *testing.T) {
	m := MapFS{
		"a-b/a": {Data: []byte("a-b/a")},
	}
	if err := TestFS(m, "a-b/a"); err != nil {
		t.Error(err)
	}
}

type shuffledFS MapFS

[TestFS] now returns a structured error that can be unwrapped
(via method `Unwrap() []error`). This allows inspecting errors

	}

	for _, test := range tests {
		test := test
		t.Run(test.path, func(t *testing.T) {
			fi, err := Stat(testFs, test.path)
			if err != nil {
				t.Fatal(err)
			}

			dirEntry := FileInfoToDirEntry(fi)
			if g, w := dirEntry.Type(), test.wantMode; g != w {
				t.Errorf("FileMode mismatch: got=%v, want=%v", g, w)
			}
			if g, w := dirEntry.Name(), test.path; g != w {

	// should propagate the NaN to their output.
	for i := 0; i < len(fs); i++ {
		testfs := Clone(fs)
		testfs[i] = math.NaN()

		fmin := Min(testfs)
		if !math.IsNaN(fmin) {
			t.Errorf("got min %v, want NaN", fmin)
		}

		fmax := Max(testfs)
		if !math.IsNaN(fmax) {
			t.Errorf("got max %v, want NaN", fmax)
		}
	}
}

)

func TestMapFS(t *testing.T) {
	m := MapFS{
		"hello":             {Data: []byte("hello, world\n")},
		"fortune/k/ken.txt": {Data: []byte("If a program is too slow, it must have a loop.\n")},
	}
	if err := TestFS(m, "hello", "fortune", "fortune/k", "fortune/k/ken.txt"); err != nil {
		t.Fatal(err)
	}
}

func TestMapFSChmodDot(t *testing.T) {
	m := MapFS{
		"a/b.txt": &MapFile{Mode: 0666},

	}
}

// Tests for issue 49514.
var _ = '"'
var _ = '\''
var _ = '🦆'

func TestGlobal(t *testing.T) {
	testFiles(t, global, "concurrency.txt", "Concurrency is not parallelism.\n")
	testFiles(t, global, "testdata/hello.txt", "hello, world\n")
	testFiles(t, global, "testdata/glass.txt", "I can eat glass and it doesn't hurt me.\n")

		}
		w++
	}
	return string(buf[:w])
}

// IsDir reports whether m describes a directory.
// That is, it tests for the [ModeDir] bit being set in m.
func (m FileMode) IsDir() bool {
	return m&ModeDir != 0
}

// IsRegular reports whether m describes a regular file.
// That is, it tests that no mode type bits are set.
func (m FileMode) IsRegular() bool {
	return m&ModeType == 0
}

	from, to := "renameFROM", "RENAMEfrom"
	tests := []struct {
		name   string
		create func() error
	}{
		{"dir", func() error {
			return Mkdir(from, 0777)
		}},
		{"file", func() error {
			fd, err := Create(from)
			if err != nil {
				return err
			}
			return fd.Close()
		}},
	}

	for _, test := range tests {
		pt.Run(test.name, func(t *testing.T) {

			if test.initialSeatsExpected != workestimateGot.InitialSeats {
				t.Errorf("Expected work estimate to match: %d initial seats, but got: %d", test.initialSeatsExpected, workestimateGot.InitialSeats)
			}
			if test.finalSeatsExpected != workestimateGot.FinalSeats {
				t.Errorf("Expected work estimate to match: %d final seats, but got: %d", test.finalSeatsExpected, workestimateGot.FinalSeats)
			}