Asserts that the test raises the expected Exception
asserts("test") { raise My::Exception }.raises(My::Exception) should("test") { raise My::Exception }.raises(My::Exception)
You can also check to see if the provided message equals or matches your expectations. The message from the actual raised exception will be converted to a string before any comparison is executed.
asserts("test") { raise My::Exception, "Foo" }.raises(My::Exception, "Foo") asserts("test") { raise My::Exception, "Foo Bar" }.raises(My::Exception, /Bar/)
In the negative case, you can test that an exception was not raised or that if an exception was raised that the type of exception was different (sounds confusing).
denies("test") { "foo" }.raises(Exception) # would pass denies("test") { raise Exception }.raises(My::Exception) # would pass denies("test") { raise Exception }.raises(Exception) # would fail
(see Riot::AssertionMacro#devaluate) @param [Class] expected_class the unexpected Exception class @param [String, nil] expected_message an optional exception message or message partial
# File lib/riot/assertion_macros/raises.rb, line 41 def devaluate(actual_exception, expected_class, expected_message=nil) actual_message = actual_exception && actual_exception.message if actual_exception.nil? pass new_message.raises(expected_class) elsif expected_class != actual_exception.class if expected_message && !(actual_message.to_s =~ %r[#{expected_message}]) pass new_message.raises(expected_class).with_message(expected_message) else pass new_message.raises(expected_class) end else message = new_message.expected_to_not_raise(expected_class) if expected_message fail message.with_message(expected_message).but.raised(actual_exception.class). with_message(actual_exception.message) else fail message end end end
(see Riot::AssertionMacro#evaluate) @param [Class] expected_class the expected Exception class @param [String, nil] expected_message an optional exception message or message partial
# File lib/riot/assertion_macros/raises.rb, line 24 def evaluate(actual_exception, expected_class, expected_message=nil) actual_message = actual_exception && actual_exception.message if actual_exception.nil? fail new_message.expected_to_raise(expected_class).but.raised_nothing elsif expected_class != actual_exception.class fail new_message.expected_to_raise(expected_class).not(actual_exception.class) elsif expected_message && !(actual_message.to_s =~ %r[#{expected_message}]) fail expected_message(expected_message).for_message.not(actual_message) else message = new_message.raises(expected_class) pass(expected_message ? message.with_message(expected_message) : message) end end