+ [ '--attr=:', 'must be provided a string' ],
+ [ '--attr=bold:underscore', 'must have strings separated by ,' ],
+ [ '--attr=b0ld', 'attribute \'b0ld\' is not valid' ],
+ [ '--attr=b0ld,underscore', 'attribute \'b0ld\' is not valid' ], # handle comma
+ [ '--attr=bold,bold', 'has attribute \'bold\' twice or more' ],