Skip test if dependency failed for particular parameter - pytest

Question

Two tests.
First, check if file exists.
Second, when file exist, check if has any content.
3 files in total.
file_0 exists and has content.
file_1 not exist
file_2 exists and is empty.
I want to skip second test for file_1 (do not see reason to check content, when file not exist) - how to do it?
Current code:
import os
from pathlib import Path
import pytest
file_0 = Path('C:\\file_0.txt')
file_1 = Path('C:\\file_1.txt')
file_2 = Path('C:\\file_2.txt')
#pytest.mark.parametrize('file_path', [file_0, file_1, file_2])
#pytest.mark.dependency(name='test_check_file_exists')
def test_file_exists(file_path):
assert file_path.is_file(), "File does not exists."
#pytest.mark.parametrize('file_path', [file_0, file_1, file_2])
#pytest.mark.dependency(depends=['test_check_file_exists'])
def test_file_has_any_data(file_path):
assert os.path.getsize(file_path) > 0, "File is empty."
Result:

Answer 1

The problem is that parametrized tests are not one, but several tests. To use dependency marks on parametrized tests, you have to make the dependency between specific parametrized tests, in your case from test_file_has_any_data[file_0] to test_file_exists[file_0] and so on.
This can be done by adding a dependency to each parameter:
#pytest.mark.parametrize("file_path", [
pytest.param(file_0, marks=pytest.mark.dependency(name="f0")),
pytest.param(file_1, marks=pytest.mark.dependency(name="f1")),
pytest.param(file_2, marks=pytest.mark.dependency(name="f2"))
])
def test_file_exists(file_path):
assert file_path.is_file(), "File does not exists."
#pytest.mark.parametrize("file_path", [
pytest.param(file_0, marks=pytest.mark.dependency(depends=["f0"])),
pytest.param(file_1, marks=pytest.mark.dependency(depends=["f1"])),
pytest.param(file_2, marks=pytest.mark.dependency(depends=["f2"]))
])
def test_file_has_any_data(file_path):
assert os.path.getsize(file_path) > 0, "File is empty."
pytest.param wraps a single parameter and allows to add marks specifically to that parameter, as can be seen.
This is also covered in the pytest-dependency documentation.