Example of multi-generator list comprehension to generate a matrix of test cases

special_char_test.erl

term_special_chars_test_() ->
    SpecialChars = ["!", "(", ")", "{", "}", "[", "]",
                    "^", "\"", "~", "*", "?", ":", "\\"],
    Formats = ["foo~sbar", "~sb", "a~s", "a~sb"],
    Terms = [ ?i2b(io_lib:format(F, ["\\" ++ C])) ||
                F <- Formats, C <- SpecialChars ],
    [ ?_assertEqual(T, hd(lucene:parse(T))) || T <- Terms ].