go sub_test 源码
golang sub_test 代码
文件路径：/src/io/fs/sub_test.go
// 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")
}
}
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