Analyse following RPM build log snippet. Describe contents accurately, without speculation or suggestions for resolution.            
Your analysis must be as concise as possible, while keeping relevant information intact.
Snippet: 
>           assert expect_line in style_str
E           AssertionError: assert '.o { color: #666666 } /* Operator */' in 'pre { line-height: 125%; }\ntd.linenos .normal { color: inherit; background-color: transparent; padding-left: 5px; pa...e.Instance */\n.vm { color: #19177C } /* Name.Variable.Magic */\n.il { color: #666 } /* Literal.Number.Integer.Long */'


Assertion error in the test failed. The test checks if expect_line, whose value is '.o { color: #666666 } /* Operator */' is in the style_str. It isn't, hence the assertion fails.