ruby - What is the solution to this blank in the code? -

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this test_symbols_cannot_be_concatenated exercise in ruby koans. previous exercises had used assert_equal tests. first assert_raise on path enlightenment.

def test_symbols_cannot_be_concatenated    assert_raise(_____)     :cats + :dogs   end end

nomethoderror guess, since makes no sense try sum or catenate 2 symbols.


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