From: sylvain <sylvain.viart@...>
Date: 2009-08-18T17:34:18+09:00
Subject: unit testing generated content

Hi,

I'm writing unit test.

I've programmed already an assert method, which purpose it to compare
a string or a file with unix diff.
The goal is to assert that a generated content multiline is exactly
what I expect.

All the beginning of the code is a kind of polymorphism, treating
argument as string or filename

All the assert job is really done in the 4 last line, with unix diff.

    def assert_content_equal(expected, actual, message = nil)
        # compare avec diff
        expected_f = "/tmp/expected#{$$}"
        actual_f = "/tmp/actual#{$$}"
        remove_expected_f = true
        remove_actual_f = true

        if expected.kind_of? String
            if (expected.size < 255 and FileTest.exists? expected)
                expected_f = expected
                remove_expected_f = false
            else
                # création du fichier avec le contenu de la string
expected
                File.open(expected_f, "w") { |f| f.print expected }
            end
        else
            raise "expected String ou nom de fichier"
        end

        # code idem avec s/expected/actual/g
        # besoin de matchit : ?if expected^MV%%"cy/# code idem^M2jV%
%x"cPV%%:s/expected/actual/g^M
        if actual.kind_of? String
            if (actual.size < 255 and FileTest.exists? actual)
                actual_f = actual
                remove_actual_f = false
            else
                # création du fichier avec le contenu de la string
actual
                File.open(actual_f, "w") { |f| f.print actual }
            end
        else
            raise "actual String ou nom de fichier"
        end


        diff = `diff #{expected_f} #{actual_f}`
        File.unlink(expected_f) if remove_expected_f
        File.unlink(actual_f) if remove_actual_f
        assert_block("échec diff <expected >actual\n#{diff}") { $? ==
0 }
    end


What I would like to do now, is to have a regexp assert multiline
match, some thing like :

assert_match_regexp(actual) {
/^start/
/something .*/
/^\s*$/
/^end/
}

Which mean I expect 4 lines, individually matching the associated
regexp

Do you see a want to achieve?

I mean, reading the blockgiven, counting the regexp, and asserting the
whole...

More that that a full regexpdiff in fact ! ;-)

Any link or clue/hint, would be nice.

Regards,
Sylvain.