def test_can_replace_stylesheet_with_key(self): foo_script = StyleSheet('/foo.css', key='foo') bar_script = StyleSheet('/bar.css', key='foo') stylesheets = StyleSheets() stylesheets.add(foo_script) stylesheets.replace_stylesheet_with_key(bar_script) assert_length(1, stylesheets) assert_contains(bar_script, stylesheets.stylesheets)