57 lines
1.5 KiB
Go
57 lines
1.5 KiB
Go
// Copyright 2020 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package fs_test
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import (
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. "io/fs"
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"testing"
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)
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type subOnly struct{ SubFS }
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func (subOnly) Open(name string) (File, error) { return nil, ErrNotExist }
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func TestSub(t *testing.T) {
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check := func(desc string, sub FS, err error) {
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t.Helper()
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if err != nil {
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t.Errorf("Sub(sub): %v", err)
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return
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}
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data, err := ReadFile(sub, "goodbye.txt")
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if string(data) != "goodbye, world" || err != nil {
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t.Errorf(`ReadFile(%s, "goodbye.txt" = %q, %v, want %q, nil`, desc, string(data), err, "goodbye, world")
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}
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dirs, err := ReadDir(sub, ".")
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if err != nil || len(dirs) != 1 || dirs[0].Name() != "goodbye.txt" {
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var names []string
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for _, d := range dirs {
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names = append(names, d.Name())
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}
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t.Errorf(`ReadDir(%s, ".") = %v, %v, want %v, nil`, desc, names, err, []string{"goodbye.txt"})
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}
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}
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// Test that Sub uses the method when present.
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sub, err := Sub(subOnly{testFsys}, "sub")
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check("subOnly", sub, err)
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// Test that Sub uses Open when the method is not present.
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sub, err = Sub(openOnly{testFsys}, "sub")
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check("openOnly", sub, err)
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_, err = sub.Open("nonexist")
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if err == nil {
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t.Fatal("Open(nonexist): succeeded")
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}
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pe, ok := err.(*PathError)
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if !ok {
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t.Fatalf("Open(nonexist): error is %T, want *PathError", err)
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}
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if pe.Path != "nonexist" {
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t.Fatalf("Open(nonexist): err.Path = %q, want %q", pe.Path, "nonexist")
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}
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}
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