code: func FileSays(t TestReporter, path string, expected []byte) bool {
  	content, err := afero.ReadFile(appFs, path)
  	if err != nil {
  		t.Error("Failed to read file: "+path, err)
  	}
  
  	return bytes.Equal(content, expected)
  }
docs: /*
  FileSays returns true if the file at the path contains the expected byte array
  content.
  */