How to create a mock class with operator[]?

Question

I am having a class with `operator[]`, like this : ``` class Base { public: virtual ~Base(){} virtual const int & operator[]( const unsigned int index ) const = 0; }; ``` How can I create a mock class using google mock framework for this method? I tried this : ``` class MockBase : public Base { public: MOCK_CONST_METHOD1( operator[], const int& ( const unsigned int ) ); }; ``` but that produces next errors : ``` error: pasting "]" and "_" does not give a valid preprocessing token error: pasting "]" and "_" does not give a valid preprocessing token error: pasting "]" and "_" does not give a valid preprocessing token error: pasting "]" and "_" does not give a valid preprocessing token ```

Accepted Answer

The `MOCK_METHOD#` macros won't work on operators. The solution given in this message says to create a regular method for mocking:

```
class Base {
 public:
 virtual ~Base () {}
 virtual bool operator==(const Base &) = 0;
};

class MockBase: public Base {
 public:
 MOCK_METHOD1(Equals, bool(const Base &));
 virtual bool operator==(const Base & rhs) { return Equals(rhs); }
}; 
```

How to create a mock class with operator[]?

Solution

Problem