What is a fixture in pytest? What are different types of fixtures? What is the scope of a fixture? What is conftest.py and why is it used? How do you share fixtures across multiple files? What are pytest markers? How do you create custom markers? How do you run tests using markers? What is the -k option in pytest? What is the difference between -k and -m? How do you run a specific test function? How do you run multiple test functions? What is parameterization in pytest? What is xfail in pytest? Difference between skip and xfail? What are pytest hooks? What is pytest_runtest_makereport? How do you capture screenshots on failure? How do you pass command-line arguments in pytest? What is the purpose of pytest.ini?