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stdin.go
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/
stdin.go
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// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package testos
import (
"io/ioutil"
"os"
"testing"
)
// returns a 'mock' stdin in the form of a file
func GetStdin(t *testing.T, content string) (func(), *os.File) {
if content == "" {
return func() {}, os.Stdin
}
tmpFile, err := ioutil.TempFile("", "example")
if err != nil {
t.Fatalf("error creating temporary file: %v", err)
}
// if anything else in this function fails, remove the file
defer func(err *error) {
if *err != nil {
os.Remove(tmpFile.Name())
}
}(&err)
if _, err := tmpFile.WriteString(content); err != nil {
t.Fatalf("error writing to file: %v", err)
}
if _, err := tmpFile.Seek(0, 0); err != nil {
t.Fatalf("error seeking in file: :%v", err)
}
cleanup := func() {
os.Remove(tmpFile.Name())
}
return cleanup, tmpFile
}