Change fixture argument handling tests to unit-tests

testing/python/fixtures.py

@@ -4108,54 +4108,34 @@ def test_fixture_named_request(testdir):
 
 def test_fixture_duplicated_arguments(testdir):
     """Raise error if there are positional and keyword arguments for the same parameter (#1682)."""
-    testdir.makepyfile(
-        """
-        import pytest
-
     with pytest.raises(TypeError) as excinfo:
 
         @pytest.fixture("session", scope="session")
         def arg(arg):
             pass
 
-        def test_error():
     assert (
         str(excinfo.value)
         == "The fixture arguments are defined as positional and keyword: scope. "
         "Use only keyword arguments."
     )
 
-    """
-    )
-
-    reprec = testdir.inline_run()
-    reprec.assertoutcome(passed=1)
-
 
 def test_fixture_with_positionals(testdir):
     """Raise warning, but the positionals should still works (#1682)."""
-    testdir.makepyfile(
-        """
-        import os
-
-        import pytest
     from _pytest.deprecated import FIXTURE_POSITIONAL_ARGUMENTS
 
     with pytest.warns(pytest.PytestDeprecationWarning) as warnings:
+
         @pytest.fixture("function", [0], True)
         def arg(monkeypatch):
             monkeypatch.setenv("AUTOUSE_WORKS", "1")
 
-
-        def test_autouse():
-            assert os.environ.get("AUTOUSE_WORKS") == "1"
     assert str(warnings[0].message) == str(FIXTURE_POSITIONAL_ARGUMENTS)
 
-    """
-    )
-
-    reprec = testdir.inline_run()
-    reprec.assertoutcome(passed=1)
+    assert arg._pytestfixturefunction.scope == "function"
+    assert arg._pytestfixturefunction.params == (0,)
+    assert arg._pytestfixturefunction.autouse
 
 
 def test_indirect_fixture_does_not_break_scope(testdir):