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stdin_test.go
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/
stdin_test.go
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package reader
import (
"bytes"
"context"
_ "fmt"
"io"
"io/ioutil"
"log"
"os"
"testing"
)
func TestStdinReader(t *testing.T) {
data := []byte("hello world")
restore := mockStdin(data)
defer restore()
ctx := context.Background()
r, err := NewReader(ctx, "stdin://")
if err != nil {
t.Fatal(err)
}
fh, err := r.Read(ctx, "-")
if err != nil {
t.Fatal(err)
}
defer fh.Close()
res, err := io.ReadAll(fh)
if err != nil {
t.Fatalf("Failed to read file handle, %v", err)
}
if bytes.Compare(res, data) != 0 {
t.Fatalf("Failed to read file contents, got '%s', expecting '%s'", res, data)
}
}
// mock stdin for testing
func mockStdin(data []byte) func() {
// create a new temp file
tmpfile, err := ioutil.TempFile("", "mock-stdin")
if err != nil {
log.Fatal(err)
}
// write data
if _, err := tmpfile.Write(data); err != nil {
log.Fatal(err)
}
// seek to beginning
if _, err := tmpfile.Seek(0, 0); err != nil {
log.Fatal(err)
}
// save a copy of the 'original stdin'
originalStdin := os.Stdin
// set os.Stdin to the temporary file
os.Stdin = tmpfile
// return a 'restore' function which removes the mock
return func() {
// restore original stdin
os.Stdin = originalStdin
// remove temp file
os.Remove(tmpfile.Name())
}
}