Unit testing generated content

Ruby
1

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 ! :wink:

Any link or clue/hint, would be nice.

Regards,
Sylvain.

2

sylvain wrote:

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

You can match a single regexp across a multi-line string; using /m
option is clearer since . then matches any character including newline.

str = “foo\nbar\nbaz\nbap\n”
=> “foo\nbar\nbaz\nbap\n”

str =~ /^bar$\n^baz$\n^bap$/m
=> 4

str =~ /^bar$.*^bap$/m
=> 4

3

sylvain wrote:

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 ! :wink:

Any link or clue/hint, would be nice.

How about:

def test_it(str)
num_lines = 4
regexs = [/^start/, /something ./, /^\s$/, /^end/]

lines = str.split("\n")
return false if lines.length != num_lines

match_results = lines.zip(regexs).collect{|line, regex| line =~ regex}
match_results.all?
end

s1 =<<ENDOFSTRING
start
something else

end of data
ENDOFSTRING

s2 =<<ENDOFSTRING
start
something else

end of data
too many lines
ENDOFSTRING

s3 =<<ENDOFSTRING
start
something else
no match here
end of data
ENDOFSTRING

[s1, s2, s3].each do |str|
puts test_it(str)
end

–output:–
true
false
false

4

Hi,

Hey cool seems great.
I’ve tried to find a way of passing regexps through the block (Proc)
without
success.

But by array it’s fine too.

def test_it(str)

num_lines = 4
regexs = [/^start/, /something ./, /^\s$/, /^end/]

lines = str.split("\n")
return false if lines.length != num_lines

match_results = lines.zip(regexs).collect{|line, regex| line =~ regex}
match_results.all?
end

Thanks, I will post the final assert, when It will be ready.

Do you think I can group my own assertion in a module or something and
load
it into my testcase ?
For the moment I’ve just added a method into the testcase, was used only
here.

Regards,
Sylvain Viart.