googletest - mocking abstract class

Question

I am learning mocking and using googletest I created MockServer class that should mock the abstract class IServer:

 class IServer { virtual void writeData(QString buffer) = 0; virtual QByteArray readData() = 0; protected: virtual ~IServer() = default; }; class MockServer: public:: testing:: Test, public IServer { MOCK_METHOD(void, writeData, (QString buffer), (override)); MOCK_METHOD(QByteArray, readData, (), (override)); };

And now want to test the other class that uses it, however, I cannot initialize MockServer because it is an abstract class. How to solve this?

TEST_F(Serv_test, start) { ?? MockServer mockServer; // <- how to declare it? EXPECT_CALL(mockServer, writeData(testing::_)).Times(1); EXPECT_CALL(mockServer, readData()).Return("testing"); Car car (nullptr, mockServer); }

Ari · Accepted Answer · 2022-05-02 21:07:31Z

You are confusing a few things:

You are using a test fixture, but a test fixture needs to be a standalone class. You are mixing it with your mock class. You need to create a separate class for it.
The Car class should take a parameter of type mock class (not the test fixture).
.Return should be used inside WillOnce or WillRepeatedly among other places. You can't use it directly on EXPECT_CALL.

I rewrote your code as follows:

class IServer { public: virtual void writeData(QString buffer) = 0; virtual QByteArray readData() = 0; protected: virtual ~IServer() = default; }; // Test fixture class Serv_test : public ::testing::Test { }; // Mock class class MockServer: public IServer { public: MOCK_METHOD(void, writeData, (QString buffer), (override)); MOCK_METHOD(QByteArray, readData, (), (override)); }; class Car{ public: Car(int*, IServer* server):_server(server){ _server->writeData("testing"); _server->readData(); } IServer* _server; }; TEST_F(Serv_test, start) { MockServer mockServer; // <- how to declare it? EXPECT_CALL(mockServer, writeData(testing::_)).Times(1); EXPECT_CALL(mockServer, readData()) .WillOnce(testing::Return("testing")); Car car (nullptr, &mockServer); }

Working example here: https://godbolt.org/z/avsKdh37r

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