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# WARNING: pseudo code
 
class Authenticator
def initialize(user_repository = User)
@user_repository = user_repository
end
 
def authenticate(identifier, hashed_password)
@user_repository.find(:username => identifier, :password => hashed_password).present?
end
end
 
describe Authenticator
let(:repo) { double("user repo") }
let(:authenticator) { Authenticator.new(repo) }
 
context "with invalid credentials"
before { repo.stub(:find => nil) }
 
it "returns false" do
authenticator.authenticate("invalid", "invalid").should_not be
end
end
 
context "with valid credentials"
before { repo.stub(:find => double) }
 
it "returns true" do
authenticator.authenticate("valid", "valid").should be
end
end
end
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