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Created June 26, 2012 02:49
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rspec let syntax trickery
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gistfile1.md

Seems variables defined by let(){} is lazily instantiated.

This caused problems like so in specs:

let(:estimate){Fabricate.build(:shipping_estimate)}
...
ShippingEstimate.should_receive(:new).and_return(estimate) 
...
# ends up calling methods on uninstantiated (nil) estimate
post :create, valid_params, valid_session

To avoid this, pre-load let variables where needed:

...
estimate
ShippingEstimate.should_receive(:new).and_return(estimate) 
...
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