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// Copyright 2021 the u-root 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 uio
import (
"os"
"path/filepath"
"strings"
"testing"
)
func readAndCheck(t *testing.T, want, tmpfileP string) {
t.Helper()
r := strings.NewReader(want)
if err := ReadIntoFile(r, tmpfileP); err != nil {
t.Errorf("ReadIntoFile(%v, %s) = %v, want no error", r, tmpfileP, err)
}
got, err := os.ReadFile(tmpfileP)
if err != nil {
t.Fatalf("os.ReadFile(%s) = %v, want no error", tmpfileP, err)
}
if want != string(got) {
t.Errorf("got: %v, want %s", string(got), want)
}
}
func TestReadIntoFile(t *testing.T) {
want := "I am the wanted"
dir := t.TempDir()
// Write to a file already exist.
p := filepath.Join(dir, "uio-out")
// Expect net effect to be creating a new empty file: "uio-out".
f, err := os.OpenFile(p, os.O_RDONLY|os.O_CREATE|os.O_TRUNC, 0o755)
if err != nil {
t.Fatal(err)
}
if err := f.Close(); err != nil {
t.Fatal(err)
}
readAndCheck(t, want, f.Name())
// Write to a file that does not exist.
p = filepath.Join(dir, "uio-out-not-existing")
readAndCheck(t, want, p)
// Write to an existing file that has pre-existing content.
p = filepath.Join(dir, "uio-out-prexist-content")
f, err = os.OpenFile(p, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0o755)
if err != nil {
t.Fatal(err)
}
if _, err := f.Write([]byte("temporary file's content")); err != nil {
t.Fatal(err)
}
if err := f.Close(); err != nil {
t.Fatal(err)
}
readAndCheck(t, want, p)
}
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