How to build and run the tests

Install Google Test

1. Install cmake
2. Get the last version of google test from https://github.com/google/googletest/releases and unzip it
3. Go to the google test folder
4. Run:

   cmake .
   sudo cmake --build . --target install

Build the tests

1. Create a build folder and navigate to it
2. Run: ``` cmake PATH/TO/test cmake –build . ``` In the build folder, the test executable will be created.

Run the tests

The test executable can be run individualy or by calling ctest

How to add Tests

Create test source code

In a Cpp file, create a test fixture class. For example, see the following code (taken from https://www.linuxembedded.fr/2014/09/introduction-a-google-c-testing-framework/)

// The fixture for testing class Foo.
class FooTest : public ::testing::Test 
{
    protected:
    // You can remove any or all of the following functions if its body
    // is empty.
    FooTest() 
    {
        // You can do set-up work for each test here.
    }
    virtual ~FooTest() 
    {
        // You can do clean-up work that doesn't throw exceptions here.
    }
 
    // If the constructor and destructor are not enough for setting up
    // and cleaning up each test, you can define the following methods:
 
    virtual void SetUp() 
    {
        // Code here will be called immediately after the constructor (right
        // before each test).
    }
 
    virtual void TearDown() 
    {
        // Code here will be called immediately after each test (right
        // before the destructor).
    }
    // Objects declared here can be used by all tests in the test case for Foo.
};
 
// Tests that the Foo::Bar() method does Abc.
TEST_F(FooTest, MethodBarDoesAbc) 
{
    const string input_filepath = "this/package/testdata/myinputfile.dat";
    const string output_filepath = "this/package/testdata/myoutputfile.dat";
    Foo f;
    EXPECT_EQ(0, f.Bar(input_filepath, output_filepath));
}
 
// No Need for main function

Add the test source file to CMakeLists.txt

We need to create a new executable for the new test fixture. Add the following code to the CMakeList.txt

set(NEW_TEST_SRC test_foo.cpp
                 # Other needed source files                        
)
 
add_executable(test_foo ${NEW_TEST_SRC})
target_link_libraries(test_foo GTest::GTest GTest::Main)
 
add_test(TestFoo test_foo) # add the test to the registry to be run with ctest