tests: fix imports not being cleaned up

Author: mattmess1221

tests/assets/default_files/default_app/api.py

@@ -21,3 +21,12 @@ def setup_terminal() -> None:
     rich_utils.FORCE_TERMINAL = False
     setup_logging(terminal_width=3000)
     return
+
+
+@pytest.fixture(autouse=True)
+def reset_imports():
+    modules = sys.modules.copy()
+    try:
+        yield
+    finally:
+        sys.modules = modules