On Aug 26, 2010, at 12:14 AM, David Chelimsky wrote:
On Aug 25, 2010, at 10:13 PM, Brian Ploetz wrote:
Environment
------------------
ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-darwin10.4.0]
rspec (1.3.0)
Code
-------
def currency_to_dollars(currency_amount)
raise ArgumentError("Currency amount can't be nil") if
currency_amount.nil?
end
Spec
--------
it "should raise an ArgumentError if currency_amount is nil" do
lambda { @service.currency_to_dollars(nil) }.should
raise_error(ArgumentError)
end
Results in this failure:
1)
'Service should raise an ArgumentError if currency_amount is nil'
FAILED
expected ArgumentError, got #<NoMethodError: undefined method
`ArgumentError' for #<Service:0x0000010087e5f0>>
This message is telling you there is no ArgumentError method, not
that the constant ArgumentError is missing. The method needs to be
(adding ".new"):
def currency_to_dollars(currency_amount)
raise ArgumentError.new("Currency amount can't be nil") if
currency_amount.nil?
end
You might see this form, too.
def currency_to_dollars(currency_amount)
raise ArgumentError, "Currency amount can't be nil" if
currency_amount.nil?
end
Note the comma that separates the arguments to raise (Kernel#raise).
-Rob
test/spec/service_spec.rb:92:in `block (2 levels) in <top
(required)>'
Changing the test to either of these two variants allows the the to
pass:
lambda { @service.currency_to_dollars(nil) }.should
raise_error(StandardError)
lambda { @service.currency_to_dollars(nil) }.should raise_error
These pass because NoMethodError, which is what is being thrown, is
a subclass of StandardError and Exception.
HTH,
David
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Rob Biedenharn
[email protected] http://AgileConsultingLLC.com/
[email protected] http://GaslightSoftware.com/
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