Fix crash that happened under --runxfail -o empty_parameter_set_mark=xfail

changelog/4497.bugfix.rst

@@ -0,0 +1 @@
+Fix the crash that occurred when pytest was invoked with `-o empty_parameter_set_mark=xfail` + `--runxfail`

src/_pytest/fixtures.py

@@ -302,7 +302,7 @@ def fillfixtures(function):
 
 
 def get_direct_param_fixture_func(request):
- return request.param
+ return request.param if hasattr(request, "param") else None
 
 
 @attr.s(slots=True)

testing/test_skipping.py

@@ -475,6 +475,41 @@ def test_foo():
  result.stdout.fnmatch_lines(["*1 passed*"])
  assert result.ret == 0
 
+ @pytest.mark.parametrize("strict", [True, False])
+ def test_runxfail_with_empty_parameter_set_mark_xfail(self, testdir, strict):
+ testdir.makeini(
+ """
+ [pytest]
+ xfail_strict = %s
+ """
+ % strict
+ )
+
+ p = testdir.makepyfile(
+ """
+ import pytest
+
+ @pytest.mark.parametrize(
+ ('a', 'b'),
+ # no cases defined yet
+ (
+ ),
+ )
+ def test(a, b):
+ assert 1 == 1
+ """
+ )
+ result = testdir.runpytest(
+ p, "--runxfail", "-o", "empty_parameter_set_mark=xfail"
+ )
+
+ result.stdout.fnmatch_lines(["*1 failed*" if strict else "*1 passed*"])
+ if strict:
+ result.stdout.fnmatch_lines(
+ ["*XPASS(strict)] got empty parameter set ('a', 'b')*"]
+ )
+ assert result.ret == (1 if strict else 0)
+
  @pytest.mark.parametrize("strict_val", ["true", "false"])
  def test_strict_xfail_default_from_file(self, testdir, strict_val):
  testdir.makeini(