#includeIn this example, the testAtLeast method checks that the variable `num` is greater than or equal to 5. If the assertion fails, a message is displayed indicating that `num` must be greater or equal to 5. The AtLeast macro is part of the CPPUNIT_NS namespace, which is defined by the CppUnit library. The library can be downloaded and installed from the CppUnit website, or it can be installed using a package manager on your operating system.class MyTest : public CPPUNIT_NS::TestFixture { CPPUNIT_TEST_SUITE(MyTest); CPPUNIT_TEST(testAtLeast); CPPUNIT_TEST_SUITE_END(); public: void testAtLeast() { int num = 10; CPPUNIT_ASSERT_MESSAGE("num must be greater or equal to 5", num >= 5); } }; CPPUNIT_TEST_SUITE_REGISTRATION(MyTest);