Add check to the Q# Bell test

// Include the external QSharp function.

// With EntryPoint() annotation, there are 3 functions generated:

// QCOR__TestBell__body(): raw Q# callable

// QCOR__TestBell__body(): raw Q# callable (marked internal)

// QCOR__TestBell(): EntryPoint type (with result printing), no return

// QCOR__TestBell__Interop(): InteropFriendly function (type casting to C-type function)

qcor_include_qsharp(QCOR__TestBell, void, int64_t)

qcor_include_qsharp(QCOR__TestBell__Interop, int64_t, int64_t)

// Compile with:

// Include both the qsharp source and this driver file 

// Run with:

// $ ./a.out

int main() {

  QCOR__TestBell(1024);

  auto one_count = QCOR__TestBell__Interop(1024);

  std::cout << "One count: " << one_count << "\n";

  // In the range of Bell experiment: 50-50

  qcor_expect(one_count > 400 && one_count < 700);

  return 0;

}

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