         
         mock.optionalProperty = nil
         XCTAssertNil(mock.optionalProperty)
+        mock.optionalProperty = 5
+        XCTAssertEqual(mock.optionalProperty, 10)
         mock.optionalProperty = 1
-        XCTAssertEqual(mock.optionalProperty, 10)
+        XCTAssertEqual(mock.optionalProperty, 1)
         
         mock.noParameter()
         

        
        mock.optionalProperty = nil
        XCTAssertNil(mock.optionalProperty)
        mock.optionalProperty = 1
        XCTAssertEqual(mock.optionalProperty, 10)
        
        mock.noParameter()
        

            when(mock.optionalProperty.set(anyInt())).then { _ in
                when(mock.optionalProperty.get).thenReturn(10)
            }
            when(mock.optionalProperty.set(eq(1))).then { _ in
                when(mock.optionalProperty.get).thenReturn(1)
            }
            
            when(mock.noParameter()).thenReturn()
            when(mock.countCharacters("hello")).thenReturn(1000)
