method_exists? (Mocha::AnyInstanceMethod)

        # File lib/mocha/any_instance_method.rb, line 45
    45:     def method_exists?(method)
    46:       existing_methods = []
    47:       existing_methods += stubbee.public_instance_methods(false)
    48:       existing_methods += stubbee.protected_instance_methods(false)
    49:       existing_methods += stubbee.private_instance_methods(false)
    50:       existing_methods.any? { |m| m.to_s == method.to_s }
    51:     end