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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"
"testing/fstest"
"time"
)
var testFsys = fstest.MapFS{
"hello.txt": {
Data: []byte("hello, world"),
Mode: 0456,
ModTime: time.Now(),
Sys: &sysValue,
},
}
var sysValue int
type readFileOnly struct{ ReadFileFS }
func (readFileOnly) Open(name string) (File, error) { return nil, ErrNotExist }
type openOnly struct{ FS }
func TestReadFile(t *testing.T) {
// Test that ReadFile uses the method when present.
data, err := ReadFile(readFileOnly{testFsys}, "hello.txt")
if string(data) != "hello, world" || err != nil {
t.Fatalf(`ReadFile(readFileOnly, "hello.txt") = %q, %v, want %q, nil`, data, err, "hello, world")
}
// Test that ReadFile uses Open when the method is not present.
data, err = ReadFile(openOnly{testFsys}, "hello.txt")
if string(data) != "hello, world" || err != nil {
t.Fatalf(`ReadFile(openOnly, "hello.txt") = %q, %v, want %q, nil`, data, err, "hello, world")
}
}
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