Controlling which tests run using pytest

Question

I'm considering converting some unittest.TestCase tests into Pytest ones to take advantage of Pytest's fixtures. One feature of unittest that I wasn't able to easily find the equivalent of in Pytest, however, is the ability to create testing suites and run them. I currently often do something like this:

import unittest

class TestSomething(unittest.TestCase):
    def test_1(self):
        self.assertEqual("hello".upper(), "HELLO")

    def test_2(self):
        self.assertEqual(1+1, 2)

if __name__ == "__main__":
    suite = unittest.TestSuite()
    # suite.addTest(TestSomething('test_1'))
    suite.addTest(TestSomething('test_2'))
    runner = unittest.TextTestRunner()
    runner.run(suite)

By commenting in and out the lines with addTest, I can easily select which tests to run. How would I do something similar with Pytest?

Answer 1

You can use the -k argument to run specific tests. For example

# put this in test.py
import unittest

class TestSomething(unittest.TestCase):
    def test_1(self):
        self.assertEqual("hello".upper(), "HELLO")

    def test_2(self):
        self.assertEqual(1+1, 2)

Running all tests in the class TestSomething can be done like this:

py.test test.py -k TestSomething

Running only test_2:

py.test test.py -k "TestSomething and test_2"

More examples in the documentation