On Mar 5, 2012, at 1:18 AM, ruud144 wrote: > hi group, > > I read that expectations can print a custom message on failure using a > syntax like > > cars.should be_empty, "Cars left"
This is because RSpec predicate matchers can accept a block: https://github.com/rspec/rspec-expectations/blob/master/spec/rspec/matchers/be_spec.rb#L174 > > But when I try this syntax for this expectation: > > string.should == 'Cars left', 'Yippee, no cars anymore' This will work: string.should eq('Cars left'), 'Yippee, no cars anymore' > > I get a syntax error: > > syntax error, unexpected ',', expecting keyword_end (SyntaxError) > > I want two things: > - I want a syntax error free expectation for should == > - I want to understand what the mechanism is. I am afraid that my ruby > knowledge is not sufficient. Clearly, should is a function, but what > are be_empty and == then? Parameters? Can I use parentheses? > > Thanks for helping me! > > Ruud > _______________________________________________ > rspec-users mailing list > rspec-users@rubyforge.org > http://rubyforge.org/mailman/listinfo/rspec-users Personally, I think custom messages should be deprecated. Nobody uses them and it's impossible to support them 100% of the time (as in predicate matchers). The default failure messages work 99% of the time, and if it doesn't, a custom matcher is the way to go. David? _______________________________________________ rspec-users mailing list rspec-users@rubyforge.org http://rubyforge.org/mailman/listinfo/rspec-users
