Spec double() stubs hash in different syntax modes.

This tests a regression referenced in #306 where disabling the :should
syntax raised errors when a stubs hash was passed to double().

spec/rspec/mocks/test_double_spec.rb

@@ -31,13 +31,18 @@ def use; end
         expect { double.foo }.to raise_error(/Mock "MyDouble" received/)
       end
 
-      it 'stubs the methods passed in the stubs hash' do
-        double = Module.new do
-          TestDouble.extend_onto(self, "MyDouble", :a => 5, :b => 10)
+      [[:should, :expect], [:expect], [:should]].each do |syntax|
+        context "with syntax #{syntax.inspect}" do
+          include_context "with syntax", syntax
+          it 'stubs the methods passed in the stubs hash' do
+            double = Module.new do
+              TestDouble.extend_onto(self, "MyDouble", :a => 5, :b => 10)
+            end
+
+            expect(double.a).to eq(5)
+            expect(double.b).to eq(10)
+          end
         end
-
-        expect(double.a).to eq(5)
-        expect(double.b).to eq(10)
       end
 
       it 'indicates what type of test double it is in error messages' do