How to make test that depends on parametrized test. (Pytest)

Question

Why second test is skipped? I want second test to depend on three tests which are parametrized as test_first. How to make it happen?

import pytest
from pytest_dependency import depends
param = [10,20,30]
@pytest.mark.parametrize("param", param)
def test_first(param):
    assert(True)

@pytest.mark.dependency(depends=['test_first'])
def test_second():
    assert(True)

Output is

t.py::test_first[10] PASSED
t.py::test_first[20] PASSED
t.py::test_first[30] PASSED
t.py::test_second SKIPPED

I want t.py::test_second PASSED

p.s. It may be to asked before, but I decided to post the question anyway, because it is hard to find briefly formulated question about this problem.

Answer 1

From this example I can see that (1) you also should decorate test_first and (2) decorate the parameter list.

# The test for the parent shall depend on the test of all its children.
# Create enriched parameter lists, decorated with the dependency marker.

childparam = [ 
    pytest.param(c, marks=pytest.mark.dependency(name="test_child[%s]" % c)) 
    for c in childs
]
parentparam = [
    pytest.param(p, marks=pytest.mark.dependency(
        name="test_parent[%s]" % p, 
        depends=["test_child[%s]" % c for c in p.children]
    )) for p in parents
]

@pytest.mark.parametrize("c", childparam)
def test_child(c):
    if c.name == "l":
        pytest.xfail("deliberate fail")
        assert False

@pytest.mark.parametrize("p", parentparam)
def test_parent(p):
    pass