Prepare migrating testing auxiliary functions from tests to testutil. Remove local duplicates on testutil.WriteToNewTempFile(). Always favor testutil.NewTestCaseDir() over ioutil.TempDir(). Add test cases for the testing auxiliary functions.
Prepare migrating testing auxiliary functions from tests to testutil. Remove local duplicates on testutil.WriteToNewTempFile(). Always favor testutil.NewTestCaseDir() over ioutil.TempDir(). Add test cases for the testing auxiliary functions.