Reponse.mock is setable through options.

lib/typhoeus/response.rb

@@ -27,7 +27,7 @@ class Response
     attr_accessor :options
 
     # @api private
-    attr_accessor :mock
+    attr_writer :mock
 
     # Create a new response.
     #
@@ -41,5 +41,10 @@ def initialize(options = {})
       @options = options
       @headers = options[:headers]
     end
+
+    # @api private
+    def mock
+      defined?(@mock) ? @mock : options[:mock]
+    end
   end
 end

spec/typhoeus/response_spec.rb

@@ -13,4 +13,31 @@
       end
     end
   end
+
+  describe "#mock" do
+    context "when @mock" do
+      before { response.mock = true }
+
+      it "returns @mock" do
+        expect(response.mock).to be_true
+      end
+    end
+
+    context "when options[:mock]" do
+      let(:options) { {:mock => true} }
+
+      it "returns options[:mock]" do
+        expect(response.mock).to be_true
+      end
+    end
+
+    context "when @mock and options[:mock]" do
+      let(:options) { {:mock => 1} }
+      before { response.mock = 2 }
+
+      it "returns @mock" do
+        expect(response.mock).to be(2)
+      end
+    end
+  end
 end