From 5a711e455ac1d68f499da57cccd787709fdfb1c6 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Fri, 6 Feb 2026 16:12:22 +0100
Subject: [PATCH] some more tests

---
 esphome/yaml_util.py            |  1 +
 tests/unit_tests/test_bundle.py | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/esphome/yaml_util.py b/esphome/yaml_util.py
index 5aab9d93c6..d03645bb69 100644
--- a/esphome/yaml_util.py
+++ b/esphome/yaml_util.py
@@ -43,6 +43,7 @@ _LOGGER = logging.getLogger(__name__)
 SECRET_YAML = "secrets.yaml"
 _SECRET_CACHE = {}
 _SECRET_VALUES = {}
+# Not thread-safe — config processing is single-threaded today.
 _load_listeners: list[Callable[[Path], None]] = []
 
 
diff --git a/tests/unit_tests/test_bundle.py b/tests/unit_tests/test_bundle.py
index 8dac080884..b8b2d0ffd1 100644
--- a/tests/unit_tests/test_bundle.py
+++ b/tests/unit_tests/test_bundle.py
@@ -761,6 +761,27 @@ def test_discover_files_external_components_local(tmp_path: Path) -> None:
     assert "components/my_comp/sensor.py" in paths
 
 
+def test_discover_files_external_components_skips_pycache(tmp_path: Path) -> None:
+    """__pycache__ directories inside local external_components are excluded."""
+    _setup_config_dir(
+        tmp_path,
+        files={
+            "components/my_comp/__init__.py": "# comp",
+            "components/my_comp/__pycache__/module.cpython-313.pyc": "bytecode",
+        },
+    )
+
+    config: dict[str, Any] = {
+        "external_components": [{"source": {"type": "local", "path": "components"}}],
+    }
+    creator = ConfigBundleCreator(config)
+    files = creator.discover_files()
+
+    paths = [f.path for f in files]
+    assert "components/my_comp/__init__.py" in paths
+    assert not any("__pycache__" in p for p in paths)
+
+
 def test_discover_files_external_components_non_dict_source(tmp_path: Path) -> None:
     """external_components with string source (e.g. github shorthand) is skipped."""
     _setup_config_dir(tmp_path)