From: Martin Hansen <mail@...>
Date: 2010-05-12T18:59:49+09:00
Subject: Re: Unit Test of method calling system() - how?

OK, I am getting closer, but are still a bit confused. I feel like 
staying away from mocks, because I am not proficient enough to tell, if 
my code and tests are working correctly or not.

Now, I have rearranged the code a bit -> http://pastie.org/956728

I still have a problem with $0. I was wondering if I could just add the 
script name to the parse method as an optional argument (or is that 
ugly?):

def parse(argv, script_name=$0)

This would make it possible to write the following tests:

test "Options.parse with empty argv and missing wiki file raises" do
  opt_parser = Options.new
  assert_raise() { opt_parser.parse([],"foo") }
end

test "Options.parse with empty argv and existing wiki file don't raise" 
do
  opt_parser = Options.new
  assert_nothing_raised() { opt_parser.parse([],"/foo/bar.rb") }
end

However, the original problem remains - I really want to test the 
following:

test "Options.parse with empty argv and existing wiki output short 
usage" do
  opt_parser = Options.new
  assert("<exp short>" == opt_parser.parse([],"/foo/bar.rb"))
end

test "Options.parse with --help in argv and existing wiki output long 
usage" do
  opt_parser = Options.new
  assert("<exp long>" == opt_parser.parse(["--help"],"/foo/bar.rb"))
end

I am actually not interested in the invocation of print_wiki, since this 
Perl script is tested - so never mind about testing the 
print_usage_and_exit -> good enuf for government work... But I am 
interested in testing the print_usage_full? and print_usage_short? 
methods. So how to do that? There is this send trick for testing private 
methods:

http://stackoverflow.com/questions/267237/whats-the-best-way-to-unit-test-protected-private-methods-in-ruby



Martin
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