I believe I have a problem with rspec let and scoping. I can use the methods defined with let in examples (the "it" blocks), but not outside (the describe block where I did the let).
5 describe Connection do
8 let(:connection) { described_class.new(connection_settings) }
9
10 it_behaves_like "any connection", connection
24 end
When I try to run this spec, I get the error:
connection_spec.rb:10: undefined local
variable or method `connection' for
Class:0xae8e5b8 (NameError)
How can I pass the connection parameter to the it_behaves_like?
Best Answer
let() is supposed to be scoped to the example blocks and unusable elsewhere. You don't actually use let() as parameters. The reason it does not work with it_behaves_like as a parameter has to do with how let() gets defined. Each example group in Rspec defines a custom class. let() defines an instance method in that class. However, when you call it_behaves_like in that custom class, it is calling at the class level rather than from within an instance.
I've used let() like this:
I've done something similar to bcobb's answer, though I rarely use shared_examples:
The definition of those shared examples are more verbose than using shared examples. I guess I find "it_behave_like" being more awkward than extending Rspec directly.
Obviously, you can add arguments to .expects_valid_connections
I wrote this to help a friend's rspec class: http://ruby-lambda.blogspot.com/2011/02/agile-rspec-with-let.html ...