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https://github.com/lightningnetwork/lnd.git
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97 lines
2.5 KiB
Go
97 lines
2.5 KiB
Go
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package fn
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import (
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"os"
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"testing"
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"github.com/stretchr/testify/require"
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)
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var (
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data1 = "The network is robust in its unstructured simplicity."
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data2 = "Nodes work all at once with little coordination."
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)
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// TestWriteFile uses same scenario of ioutil asserting the content created and
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// stored on new file with the original one.
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func TestWriteFile(t *testing.T) {
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t.Parallel()
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f, deferred := ensureTempfile(t)
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filename := f.Name()
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defer deferred()
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// Write file.
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err := WriteFile(filename, []byte(data2), 0644)
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require.NoError(t, err, "couldn't write file")
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ensureFileContents(t, filename, data2)
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// Overwrite file.
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err = WriteFile(filename, []byte(data1), 0644)
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require.NoError(t, err, "couldn't overwrite file")
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ensureFileContents(t, filename, data1)
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// Change file permission to read-only.
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err = os.Chmod(filename, 0444)
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require.NoError(t, err, "couldn't change file to read-only")
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// Write must fail and keep the file.
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err = WriteFile(filename, []byte(data2), 0644)
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require.Error(t, err, "shouldn't write a read-only file")
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_, err = os.Stat(filename)
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require.NoError(t, err, "shouldn't remove file on error")
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ensureFileContents(t, filename, data1)
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}
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func TestWriteFileRemove(t *testing.T) {
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t.Parallel()
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f, deferred := ensureTempfile(t)
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filename := f.Name()
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defer deferred()
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// Write file.
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err := WriteFileRemove(filename, []byte(data2), 0644)
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require.NoError(t, err, "couldn't write file")
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ensureFileContents(t, filename, data2)
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// Overwrite file.
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err = WriteFileRemove(filename, []byte(data1), 0644)
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require.NoError(t, err, "couldn't overwrite file")
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ensureFileContents(t, filename, data1)
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// Change file permission to read-only.
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err = os.Chmod(filename, 0444)
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require.NoError(t, err, "couldn't change file to read-only")
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// Write must fail and remove the file.
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err = WriteFileRemove(filename, []byte(data2), 0644)
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require.Error(t, err, "shouldn't write a read-only file")
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_, err = os.Stat(filename)
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require.ErrorContains(
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t, err, "no such file or directory",
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"should remove file on error",
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)
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}
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func ensureTempfile(t *testing.T) (*os.File, func()) {
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t.Helper()
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f, err := os.CreateTemp("", "fn-io-test-TestWriteFile")
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require.NoError(t, err, "couldn't create temporary file")
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return f, func() {
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f.Close()
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os.Remove(f.Name())
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}
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}
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func ensureFileContents(t *testing.T, filename string, data string) {
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t.Helper()
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contents, err := os.ReadFile(filename)
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require.NoError(t, err, "couldn't read file")
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require.Equal(t, data, string(contents))
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}
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