Query Comprehension Analyzers
Of course, the query comprehension by a search engine is but a metaphor. Yet one eventually gets used to the search engines' "creativity" in the interpretation of queries: their search prompts, spelling corrections, their attempts at refining or improving the query, or re-ordering the answers according to the assumed object of inquiry etc.
At present, the analyzers in this group test such relatively primitive skills of the search engines, as correcting typos, giving prompts, expanding queries by synonyms. Meanwhile, some more refined search techniques (query interpretation, dealing with multiple meaning queries and so on) are to be estimated only indirectly, by mistakes arising when the query is misunderstood by the search engine. (Search Engine Mistake Analyzers, several in number, are arranged in a distinct group.) But then, it's the occasional mistakes that most clearly demonstrate a SE's skill in processing the queries. When the search results are correct, we just don't pay any attention to the search engine's "tricks". These tricks are only exposed through incongruent or funny output.