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For this exercise, I will assume you followed Creating a new plugin and have the "tangent" plugin created and working.

Let's consider the following directory structure:

#!c++

--- C:\Code
----- CodeTrainer
----- CodeTrainerPlugins
----- gtest

If you go to the "C:\Code\CodeTrainerPlugins\unit_test" directory, you will notice the following structure:

#!c++

--- C:\Code\CodeTrainerPlugins\unit_test
----- sine.cc
----- util.cc
----- util.h
----- CMakeLists.txt
----- unit_test.vcxproj.user.in

Copy the file "sine.cc" to "tangent.cc" and modify it to look like this:

#!c++

#include "gtest/gtest.h"
#include <string>
#include "base/Interfaces.h"
#include "util.h"

class TestTangent: public ::testing::Test
{
protected:
    virtual void SetUp()
    {
        Test::SetUp();

        pFunction = GetPluginFunction("plugins/functions/tangent.dll");
        if (!pFunction)
        {
            ASSERT_EQ(1, 0);
        }
    }

    virtual void TearDown()
    {
        Test::TearDown();
    }

    IFunction* pFunction;
};

TEST_F(TestTangent, TestTangentOfZeroIsZero)
{
    EXPECT_DOUBLE_EQ(0, pFunction->Evaluate(0));
}

Close all instances of Visual Studio, launch the buildall.bat and wait for the build to finish. After this, you can run "unit_test.exe" from the install directory and you can notice that there is also a unit test ran for "tangent" plugin.