diff --git a/testing/example_scripts/issue_519.py b/testing/example_scripts/issue_519.py
index da92e4246..d8b28521d 100644
--- a/testing/example_scripts/issue_519.py
+++ b/testing/example_scripts/issue_519.py
@@ -1,50 +1,54 @@
 
 import pytest
 import pprint
+
+
 def pytest_generate_tests(metafunc):
-    if 'arg1' in metafunc.fixturenames:
-        metafunc.parametrize("arg1", [ 'arg1v1', 'arg1v2' ], scope='module')
+    if "arg1" in metafunc.fixturenames:
+        metafunc.parametrize("arg1", ["arg1v1", "arg1v2"], scope="module")
 
-    if 'arg2' in metafunc.fixturenames:
-        metafunc.parametrize("arg2", [ 'arg2v1', 'arg2v2' ], scope='function')
+    if "arg2" in metafunc.fixturenames:
+        metafunc.parametrize("arg2", ["arg2v1", "arg2v2"], scope="function")
 
-@pytest.fixture(scope='session')
+
+@pytest.fixture(scope="session")
 def checked_order():
     order = []
 
     yield order
     pprint.pprint(order)
-    assert order == [
-        ('testing/example_scripts/issue_519.py', 'fix1', 'arg1v1'),
-        ('test_one[arg1v1-arg2v1]', 'fix2', 'arg2v1'),
-        ('test_two[arg1v1-arg2v1]', 'fix2', 'arg2v1'),
-
-        ('test_one[arg1v1-arg2v2]', 'fix2', 'arg2v2'),
-        ('test_two[arg1v1-arg2v2]', 'fix2', 'arg2v2'),
-
-        ('testing/example_scripts/issue_519.py', 'fix1', 'arg1v2'),
-        ('test_one[arg1v2-arg2v1]', 'fix2', 'arg2v1'),
-        ('test_two[arg1v2-arg2v1]', 'fix2', 'arg2v1'),
-
-        ('test_one[arg1v2-arg2v2]', 'fix2', 'arg2v2'),
-        ('test_two[arg1v2-arg2v2]', 'fix2', 'arg2v2'),
-    ]
+    assert (
+        order
+        == [
+            ("testing/example_scripts/issue_519.py", "fix1", "arg1v1"),
+            ("test_one[arg1v1-arg2v1]", "fix2", "arg2v1"),
+            ("test_two[arg1v1-arg2v1]", "fix2", "arg2v1"),
+            ("test_one[arg1v1-arg2v2]", "fix2", "arg2v2"),
+            ("test_two[arg1v1-arg2v2]", "fix2", "arg2v2"),
+            ("testing/example_scripts/issue_519.py", "fix1", "arg1v2"),
+            ("test_one[arg1v2-arg2v1]", "fix2", "arg2v1"),
+            ("test_two[arg1v2-arg2v1]", "fix2", "arg2v1"),
+            ("test_one[arg1v2-arg2v2]", "fix2", "arg2v2"),
+            ("test_two[arg1v2-arg2v2]", "fix2", "arg2v2"),
+        ]
+    )
 
 
-
-
-@pytest.yield_fixture(scope='module')
+@pytest.yield_fixture(scope="module")
 def fix1(request, arg1, checked_order):
-    checked_order.append((request.node.name, 'fix1', arg1))
-    yield 'fix1-' + arg1
+    checked_order.append((request.node.name, "fix1", arg1))
+    yield "fix1-" + arg1
 
-@pytest.yield_fixture(scope='function')
+
+@pytest.yield_fixture(scope="function")
 def fix2(request, fix1, arg2, checked_order):
-    checked_order.append((request.node.name, 'fix2', arg2))
-    yield 'fix2-' + arg2 + fix1
+    checked_order.append((request.node.name, "fix2", arg2))
+    yield "fix2-" + arg2 + fix1
+
 
 def test_one(fix2):
     pass
 
+
 def test_two(fix2):
     pass