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// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package fs_test
import (
. "io/fs"
"testing"
)
type readDirOnly struct{ ReadDirFS }
func (readDirOnly) Open(name string) (File, error) { return nil, ErrNotExist }
func TestReadDir(t *testing.T) {
check := func(desc string, dirs []DirEntry, err error) {
t.Helper()
if err != nil || len(dirs) != 2 || dirs[0].Name() != "hello.txt" || dirs[1].Name() != "sub" {
var names []string
for _, d := range dirs {
names = append(names, d.Name())
}
t.Errorf("ReadDir(%s) = %v, %v, want %v, nil", desc, names, err, []string{"hello.txt", "sub"})
}
}
// Test that ReadDir uses the method when present.
dirs, err := ReadDir(readDirOnly{testFsys}, ".")
check("readDirOnly", dirs, err)
// Test that ReadDir uses Open when the method is not present.
dirs, err = ReadDir(openOnly{testFsys}, ".")
check("openOnly", dirs, err)
// Test that ReadDir on Sub of . works (sub_test checks non-trivial subs).
sub, err := Sub(testFsys, ".")
if err != nil {
t.Fatal(err)
}
dirs, err = ReadDir(sub, ".")
check("sub(.)", dirs, err)
}
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