Be stricter with imports in tests

Author: hynek

pyproject.toml

@@ -55,7 +55,12 @@ raw-options = { local_scheme = "no-local-version" }
 
 
 [tool.pytest.ini_options]
-addopts = ["-ra", "--strict-markers", "--strict-config"]
+addopts = [
+  "-ra",
+  "--strict-markers",
+  "--strict-config",
+  "--import-mode=importlib",
+]
 xfail_strict = true
 testpaths = "tests"
 filterwarnings = ["once::Warning"]