123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657 |
- // 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 subOnly struct{ SubFS }
- func (subOnly) Open(name string) (File, error) { return nil, ErrNotExist }
- func TestSub(t *testing.T) {
- check := func(desc string, sub FS, err error) {
- t.Helper()
- if err != nil {
- t.Errorf("Sub(sub): %v", err)
- return
- }
- data, err := ReadFile(sub, "goodbye.txt")
- if string(data) != "goodbye, world" || err != nil {
- t.Errorf(`ReadFile(%s, "goodbye.txt" = %q, %v, want %q, nil`, desc, string(data), err, "goodbye, world")
- }
- dirs, err := ReadDir(sub, ".")
- if err != nil || len(dirs) != 1 || dirs[0].Name() != "goodbye.txt" {
- 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{"goodbye.txt"})
- }
- }
- // Test that Sub uses the method when present.
- sub, err := Sub(subOnly{testFsys}, "sub")
- check("subOnly", sub, err)
- // Test that Sub uses Open when the method is not present.
- sub, err = Sub(openOnly{testFsys}, "sub")
- check("openOnly", sub, err)
- _, err = sub.Open("nonexist")
- if err == nil {
- t.Fatal("Open(nonexist): succeeded")
- }
- pe, ok := err.(*PathError)
- if !ok {
- t.Fatalf("Open(nonexist): error is %T, want *PathError", err)
- }
- if pe.Path != "nonexist" {
- t.Fatalf("Open(nonexist): err.Path = %q, want %q", pe.Path, "nonexist")
- }
- }
|