Add simpler tests that still reproduce the issue

Author: cdunklau

testing/test_basic.py

@@ -494,6 +494,64 @@ def test_second(foo):
     assert_outcomes(rr, {"passed": 2})
 
 
+@skip_if_no_async_await()
+def test_async_simple_fixture_in_fixture(testdir, cmd_opts):
+    test_file = """
+    import itertools
+    from twisted.internet import reactor, defer
+    import pytest
+    import pytest_twisted
+
+    @pytest_twisted.async_fixture(name='four')
+    async def fixture_four():
+        return 4
+
+    @pytest_twisted.async_fixture(name='doublefour')
+    async def fixture_doublefour(four):
+        return 2 * four
+
+    @pytest_twisted.ensureDeferred
+    async def test_four(four):
+        assert four == 4
+
+    @pytest_twisted.ensureDeferred
+    async def test_doublefour(doublefour):
+        assert doublefour == 8
+    """
+    testdir.makepyfile(test_file)
+    rr = testdir.run(sys.executable, "-m", "pytest", "-v", *cmd_opts)
+    assert_outcomes(rr, {"passed": 2})
+
+
+@skip_if_no_async_generators()
+def test_async_yield_simple_fixture_in_fixture(testdir, cmd_opts):
+    test_file = """
+    import itertools
+    from twisted.internet import reactor, defer
+    import pytest
+    import pytest_twisted
+
+    @pytest_twisted.async_yield_fixture(name='four')
+    async def fixture_four():
+        yield 4
+
+    @pytest_twisted.async_yield_fixture(name='doublefour')
+    async def fixture_doublefour(four):
+        yield 2 * four
+
+    @pytest_twisted.ensureDeferred
+    async def test_four(four):
+        assert four == 4
+
+    @pytest_twisted.ensureDeferred
+    async def test_doublefour(doublefour):
+        assert doublefour == 8
+    """
+    testdir.makepyfile(test_file)
+    rr = testdir.run(sys.executable, "-m", "pytest", "-v", *cmd_opts)
+    assert_outcomes(rr, {"passed": 2})
+
+
 @skip_if_no_async_await()
 @pytest.mark.parametrize('innerasync', [
     pytest.param(truth, id='innerasync={}'.format(truth))