Pytest – Parameterizing Tests
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Parameterizing of a test is done to run the test against multiple sets of inputs. We can do this by using the following marker −
@pytest.mark.parametrize
Copy the below code into a file called test_multiplication.py −
import pytest @pytest.mark.parametrize("num, output",[(1,11),(2,22),(3,35),(4,44)]) def test_multiplication_11(num, output): assert 11*num == output
Here the test multiplies an input with 11 and compares the result with the expected output.
The test has 4 sets of inputs, each has 2 values – one is the number to be multiplied with
11 and the other is the expected result.
Execute the test by running the following command −
Pytest -k multiplication -v
The above command will generate the following output −
test_multiplication.py::test_multiplication_11[1-11] PASSED test_multiplication.py::test_multiplication_11[2-22] PASSED test_multiplication.py::test_multiplication_11[3-35] FAILED test_multiplication.py::test_multiplication_11[4-44] PASSED ============================================== FAILURES ============================================== _________________ test_multiplication_11[3-35] __________________ num = 3, output = 35 @pytest.mark.parametrize("num, output",[(1,11),(2,22),(3,35),(4,44)]) def test_multiplication_11(num, output): > assert 11*num == output E assert (11 * 3) == 35 test_multiplication.py:5: AssertionError ============================== 1 failed, 3 passed, 8 deselected in 0.08 seconds ==============================
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