Mocking elements of an array in turtle mock

I need to mock elements of an array in turtle mock. Unfortunately, because the turtle mock macro MOCK_BASE_CLASS adds extra "gunk", e.g. mock::object, mock::detail::base<> etc, the sizes of the base and mock types are no longer identical. Therefore, and pointer indexing fails when a pointer to a base class points to an array of the mock type, as shown below.

#define BOOST_TEST_MODULE First_TestSuite  #include <boost/test/included/unit_test.hpp>  #include <turtle/mock.hpp>  #include <iostream>    struct Foo  {      int data = 42;  };    MOCK_BASE_CLASS(mockFoo , Foo)  {  };    BOOST_AUTO_TEST_CASE( Demo )  {      mockFoo mf[10];      Foo* b = mf;        std::cout << "b[1].data = " << b[1].data << std::endl;      BOOST_CHECK(b[1].data == 42);      //BOOST_CHECK(sizeof(mockFoo) == sizeof(Foo));  // Also fails. This is the culprit  }  

Execution output

Running 1 test case...  b[1].data = 32764  Test047b.cpp(23): error: in "Demo": check b[1].data == 42 has failed    *** 1 failure is detected in the test module "First_TestSuite"  

I'd appreciate suggestions on how to solve this problem. Please note that I cannot change mocking framework and the base type has to be a pointer, so that it store a pointer to an array to the base or the mock type.

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Update

The following example is closer to the problem that I encountered. Using MOCK_BASE_CLASS is practically inevitable in order to mock a virtual function. I am aware that the problem is storing an array of mockFoo as Foo. I have now found a solution, which I will post subject to feedback.

struct Foo  {      int value = 42;      int func(){ return value;}      virtual void unused(){}  };    MOCK_BASE_CLASS(mockFoo , Foo)  {      MOCK_METHOD(unused , 0 , void());  };    struct Bar  {      Bar(Foo* f) : foo(f)      {      }        Foo* foo;  };    BOOST_AUTO_TEST_CASE( Demo )  {      mockFoo mf[10];      Bar bar(mf); // uh-oh!         int value = bar.foo[1].func();      std::cout << "bar.foo[1].func() = " << value << std::endl;      BOOST_CHECK(42 == value);  }  

Result

Running 1 test case...  bar.foo[1].func() = -960497840  Test047d.cpp(35): error: in "Demo": check 42 == value has failed    *** 1 failure is detected in the test module "First_TestSuite"  

https://stackoverflow.com/questions/66605046/mocking-elements-of-an-array-in-turtle-mock March 13, 2021 at 02:08AM