6 Write value-parameterzied tests Step 1: Define a fixture class.Be derived from ::testing::TestWithParam<T>, where T is the type of your parameter values. TestWithParam<T> is itself derived from ::testing::Test. T can be any copyable type.If it's a raw pointer, you are responsible for managing the lifespan of the pointed values.
7 Step 2: use the TEST_P macro To define as many test patterns using this fixture as you want.The _P suffix is for "parameterized" or "pattern", whichever you prefer to think.
8 Step 3: use INSTANTIATE_TEST_CASE_P to instantiate the test case with any set of parameters you want.Google Test defines a number of functions for generating test parameters.They return what we call (surprise!) parameter generators.
9 Functions for generating test parameters all in the testing namespace: