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class RaiseErrorMatcher
attr_writer :block
def initialize(exception, message, &block)
@exception = exception
@message = message
@block = block
@actual = nil
end
# This #matches? method is unusual because it doesn't always return a boolean but instead
# re-raises the original exception if proc.call raises an exception and #matching_exception? is false.
# The reasoning is the original exception class matters and we don't want to change it by raising another exception,
# so instead we attach the #failure_message and extract it in ExceptionState#message.
def matches?(proc)
@result = proc.call
return false
rescue Exception => actual
@actual = actual
if matching_exception?(actual)
# The block has its own expectations and will throw an exception if it fails
@block[actual] if @block
return true
else
actual.instance_variable_set(:@mspec_raise_error_message, failure_message)
raise actual
end
end
def matching_class?(exc)
@exception === exc
end
def matching_message?(exc)
case @message
when String
@message == exc.message
when Regexp
@message =~ exc.message
else
true
end
end
def matching_exception?(exc)
matching_class?(exc) and matching_message?(exc)
end
def exception_class_and_message(exception_class, message)
if message
"#{exception_class} (#{message})"
else
"#{exception_class}"
end
end
def format_expected_exception
exception_class_and_message(@exception, @message)
end
def format_exception(exception)
exception_class_and_message(exception.class, exception.message)
end
def failure_message
message = ["Expected #{format_expected_exception}"]
if @actual
message << "but got: #{format_exception(@actual)}"
else
message << "but no exception was raised (#{MSpec.format(@result)} was returned)"
end
message
end
def negative_failure_message
message = ["Expected to not get #{format_expected_exception}", ""]
unless @actual.class == @exception
message[1] = "but got: #{format_exception(@actual)}"
end
message
end
end
module MSpecMatchers
private def raise_error(exception = Exception, message = nil, &block)
RaiseErrorMatcher.new(exception, message, &block)
end
end
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