test: add test for backwards compatibility

Signed-off-by: Simon Brugman <sfbbrugman@gmail.com>

kedro-airflow/kedro_airflow/plugin.py

@@ -40,7 +40,7 @@ def _load_config(context: KedroContext) -> dict[str, Any]:
     config_loader = context.config_loader
     if not hasattr(config_loader, "config_patterns"):
         return config_loader.get("airflow*", "airflow/**")
-    
+
     # Set the default pattern for `airflow` if not provided in `settings.py`
     if "airflow" not in config_loader.config_patterns.keys():
         config_loader.config_patterns.update(  # pragma: no cover

kedro-airflow/tests/test_plugin.py

@@ -5,8 +5,11 @@
 
 import pytest
 import yaml
+from kedro.config import ConfigLoader
+from kedro.framework.context import KedroContext
+from pluggy import PluginManager
 
-from kedro_airflow.plugin import commands
+from kedro_airflow.plugin import _load_config, commands
 
 
 @pytest.mark.parametrize(
@@ -264,3 +267,22 @@ def test_create_airflow_all_and_pipeline(cli_runner, metadata):
         "Error: Invalid value: The `--all` and `--pipeline` option are mutually exclusive."
         in result.stdout
     )
+
+
+def test_config_loader_backwards_compatibility(cli_runner, metadata):
+    # Emulate ConfigLoader in kedro <= 0.18.2
+    conf_source = Path.cwd() / "conf"
+    config_loader = ConfigLoader(conf_source=conf_source)
+    del config_loader.config_patterns
+    context = KedroContext(
+        config_loader=config_loader,
+        hook_manager=PluginManager(project_name=metadata.project_name),
+        package_name=metadata.package_name,
+        project_path=metadata.project_path,
+    )
+
+    config = _load_config(context)
+    assert config == {
+        "default": {"owner": "again someone else"},
+        "ds": {"owner": "finally someone else"},
+    }