package file import ( "io/ioutil" "os" "path/filepath" "testing" "github.com/stretchr/testify/require" ) // This doesn't really test the "atomic" part of this function. It really // tests that it just writes the file properly. I would love to test this // better but I'm not sure how. -mitchellh func TestWriteAtomic(t *testing.T) { require := require.New(t) td, err := ioutil.TempDir("", "lib-file") require.NoError(err) defer os.RemoveAll(td) // Create a subdir that doesn't exist to test that it is created path := filepath.Join(td, "subdir", "file") // Write expected := []byte("hello") require.NoError(WriteAtomic(path, expected)) // Read and verify actual, err := ioutil.ReadFile(path) require.NoError(err) require.Equal(expected, actual) }