[c++] How can I solve the error LNK2019: unresolved external symbol - function?

In Visual Studio 2017 if you want to test public members, simply put your real project and test project in the same solution, and add a reference to your real project in the test project.

See C++ Unit Testing in Visual Studio from the MSDN blog for more details. You can also check Write unit tests for C/C++ in Visual Studio as well as Use the Microsoft Unit Testing Framework for C++ in Visual Studio, the latter being if you need to test non public members and need to put the tests in the same project as your real code.

Note that things you want to test will need to be exported using __declspec(dllexport). See Exporting from a DLL Using __declspec(dllexport) for more details.

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How can I solve the error LNK2019: unresolved external symbol - function? Error LNK2019: Unresolved External Symbol in Visual Studio LNK2019: unresolved external symbol _main referenced in function ___tmainCRTStartup