Prevent imports from tests in core codebase (#133928)

Co-authored-by: epenet <6771947+epenet@users.noreply.github.com>

pyproject.toml

@@ -904,6 +904,7 @@ mark-parentheses = false
 [tool.ruff.lint.flake8-tidy-imports.banned-api]
 "async_timeout".msg = "use asyncio.timeout instead"
 "pytz".msg = "use zoneinfo instead"
+"tests".msg = "You should not import tests"
 
 [tool.ruff.lint.isort]
 force-sort-within-sections = true

script/ruff.toml

@@ -5,3 +5,7 @@ extend = "../pyproject.toml"
 forced-separate = [
     "tests",
 ]
+
+[lint.flake8-tidy-imports.banned-api]
+"async_timeout".msg = "use asyncio.timeout instead"
+"pytz".msg = "use zoneinfo instead"

tests/ruff.toml

@@ -10,6 +10,10 @@ extend-ignore = [
     "SLF001", # Private member accessed: Tests do often test internals a lot
 ]
 
+[lint.flake8-tidy-imports.banned-api]
+"async_timeout".msg = "use asyncio.timeout instead"
+"pytz".msg = "use zoneinfo instead"
+
 [lint.isort]
 known-first-party = [
     "homeassistant",