assert(test, msg = (nomsg = true; nil)) public

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March 11, 2010
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Use message param

The message param is invaluable in case test fails – if you use it to display relevant info, you will find out what went wrong much faster.

Reworking the silly example above:

assert some_list.include?(5)

will only tell you that

<false> is not true.

which isn’t terribly helpful, is it? But if you use message like that:

assert some_list.include?(5), "some_list = #{some_list.inspect}"

the output will be:

some_list = [1, 2].
<false> is not true.

which in most cases should give you strong hints as to why the test failed.