# File lib/mocha/mock.rb, line 87
87:     def stubs(method_name_or_hash, backtrace = nil)
88:       iterator = ArgumentIterator.new(method_name_or_hash)
89:       iterator.each { |*args|
90:         method_name = args.shift
91:         ensure_method_not_already_defined(method_name)
92:         expectation = Expectation.new(self, method_name, backtrace)
93:         expectation.at_least(0)
94:         expectation.returns(args.shift) if args.length > 0
95:         @expectations.add(expectation)
96:       }
97:     end