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package ioutil
import (
"os"
"path/filepath"
"testing"
"github.com/stretchr/testify/require"
)
func TestNoOutputStream(t *testing.T) {
writer, closer, aborter, err := NoOutputStream()()
require.NoError(t, err)
require.Nil(t, writer)
require.Nil(t, closer)
require.Nil(t, aborter)
}
func TestToStdOut(t *testing.T) {
writer, closer, aborter, err := ToStdOut()()
require.NoError(t, err)
require.Same(t, os.Stdout, writer)
// Should not close StdOut
require.NoError(t, closer.Close())
_, err = os.Stdout.WriteString("TestToStdOut After Close\n")
require.NoError(t, err)
aborter()
_, err = os.Stdout.WriteString("TestToStdOut After Abort\n")
require.NoError(t, err)
}
func TestToAtomicFile(t *testing.T) {
t.Run("Abort", func(t *testing.T) {
dir := t.TempDir()
path := filepath.Join(dir, "test.txt")
writer, closer, aborter, err := ToAtomicFile(path, 0o644)()
defer closer.Close()
require.NoError(t, err)
expected := []byte("test")
_, err = writer.Write(expected)
require.NoError(t, err)
aborter()
_, err = os.Stat(path)
require.ErrorIs(t, err, os.ErrNotExist, "Should not have written file")
})
t.Run("Close", func(t *testing.T) {
dir := t.TempDir()
path := filepath.Join(dir, "test.txt")
writer, closer, _, err := ToAtomicFile(path, 0o644)()
defer closer.Close()
require.NoError(t, err)
expected := []byte("test")
_, err = writer.Write(expected)
require.NoError(t, err)
_, err = os.Stat(path)
require.ErrorIs(t, err, os.ErrNotExist, "Target file should not exist prior to Close")
require.NoError(t, closer.Close())
actual, err := os.ReadFile(path)
require.NoError(t, err)
require.Equal(t, expected, actual)
})
}
func TestToStdOutOrFileOrNoop(t *testing.T) {
t.Run("EmptyOutputPath", func(t *testing.T) {
writer, _, _, err := ToStdOutOrFileOrNoop("", 0o644)()
require.NoError(t, err)
require.Nil(t, writer, "Should use no output stream")
})
t.Run("StdOut", func(t *testing.T) {
writer, _, _, err := ToStdOutOrFileOrNoop("-", 0o644)()
require.NoError(t, err)
require.Same(t, os.Stdout, writer, "Should use std out")
})
t.Run("File", func(t *testing.T) {
dir := t.TempDir()
path := filepath.Join(dir, "test.txt")
writer, closer, _, err := ToStdOutOrFileOrNoop(path, 0o644)()
defer closer.Close()
require.NoError(t, err)
expected := []byte("test")
_, err = writer.Write(expected)
require.NoError(t, err)
require.NoError(t, closer.Close())
actual, err := os.ReadFile(path)
require.NoError(t, err)
require.Equal(t, expected, actual)
})
}