diff --git a/tests/test_isort.py b/tests/test_isort.py
index d46862f09..44dc93e6b 100644
--- a/tests/test_isort.py
+++ b/tests/test_isort.py
@@ -54,9 +54,12 @@
 def default_settings_path(tmpdir_factory) -> Iterator[str]:
     config_dir = tmpdir_factory.mktemp("config")
     config_file = config_dir.join(".editorconfig").strpath
+
     with open(config_file, "w") as editorconfig:
         editorconfig.write(TEST_DEFAULT_CONFIG)
 
+    assert Config(config_file).known_other
+
     with config_dir.as_cwd():
         yield config_dir.strpath