chore: deflake tmpdir cleanup in tests (#3573)

Author: akshayka

docs/guides/editor_features/watching.md

@@ -45,11 +45,15 @@ Guide](module_autoreloading.md)
 !!! note
     Support for watching data files and automatically refreshing cells that depend on them is coming soon. Follow along at <https://github.com/marimo-team/marimo/issues/3258>
 
-## Developing in WASM mode
+## Hot-reloading WebAssembly notebooks
+
+Follow these steps to develop a notebook using your own editor while
+previewing it as a [WebAssembly notebook](../wasm.md) in the browser. This lets
+you take advantage of local development tools while seeing the notebook as it
+appears when deployed as a WebAssembly notebook.
 
-Follow these steps to develop a notebook using your own editor, while previewing it as a WebAssembly notebook in the browser. This lets you take advantage of local development tools while seeing the notebook as it appears when deployed as a [WebAssembly notebook](../wasm.md).
 ```bash
-# in one terminal, start a watched edit session
+# in one terminal, start a watched edit (or run) session
 marimo edit notebook.py --watch
 
 # in another terminal
@@ -58,4 +62,4 @@ marimo export html-wasm notebook.py -o output_dir --watch
 # in a third terminal, serve the WASM application
 cd path/to/output_dir
 python -m http.server  # or a server that watches for changes
-```
+```

tests/conftest.py

@@ -229,6 +229,16 @@ def executing_kernel() -> Generator[Kernel, None, None]:
     mocked.teardown()
 
 
+def _cleanup_tmp_dir(tmp_dir: TemporaryDirectory) -> None:
+    try:
+        # Tests shouldn't care whether temporary directory cleanup
+        # fails. Python 3.10+ has an ignore_cleanup_error argument,
+        # but we still support 3.9.
+        tmp_dir.cleanup()
+    except Exception:
+        pass
+
+
 @pytest.fixture
 def temp_marimo_file() -> Generator[str, None, None]:
     tmp_dir = TemporaryDirectory()
@@ -258,7 +268,7 @@ def __(mo):
             f.write(content)
         yield tmp_file
     finally:
-        tmp_dir.cleanup()
+        _cleanup_tmp_dir(tmp_dir)
 
 
 @pytest.fixture
@@ -301,7 +311,7 @@ def __(mo):
             f.write(content)
         yield tmp_file
     finally:
-        tmp_dir.cleanup()
+        _cleanup_tmp_dir(tmp_dir)
 
 
 @pytest.fixture
@@ -330,7 +340,7 @@ async def __():
             f.flush()
         yield tmp_file
     finally:
-        tmp_dir.cleanup()
+        _cleanup_tmp_dir(tmp_dir)
 
 
 @pytest.fixture
@@ -372,7 +382,7 @@ def __():
             f.flush()
         yield tmp_file
     finally:
-        tmp_dir.cleanup()
+        _cleanup_tmp_dir(tmp_dir)
 
 
 @pytest.fixture
@@ -416,7 +426,7 @@ def __():
             f.write(content)
         yield tmp_file
     finally:
-        tmp_dir.cleanup()
+        _cleanup_tmp_dir(tmp_dir)
 
 
 @pytest.fixture
@@ -449,7 +459,7 @@ def temp_md_marimo_file() -> Generator[str, None, None]:
             f.write(content)
         yield tmp_file
     finally:
-        tmp_dir.cleanup()
+        _cleanup_tmp_dir(tmp_dir)
 
 
 @pytest.fixture
@@ -486,7 +496,7 @@ def __():
             f.write(content)
         yield tmp_file
     finally:
-        tmp_dir.cleanup()
+        _cleanup_tmp_dir(tmp_dir)
 
 
 @pytest.fixture
@@ -518,7 +528,7 @@ def __():
             f.write(content)
         yield tmp_file
     finally:
-        tmp_dir.cleanup()
+        _cleanup_tmp_dir(tmp_dir)
 
 
 # Factory to create ExecutionRequests and abstract away cell ID