add test

Author: Ray Bell

intake_xarray/tests/test_derived.py

@@ -1,3 +1,23 @@
+import os
+import pytest
+
+from intake import open_catalog
+from xarray.tests import assert_allclose
+
+
+# Function used in xarray_source_sel entry in catalog.yaml
 def _sel(ds, indexers: str):
     """indexers: dict (stored as str) which is passed to xarray.Dataset.sel"""
     return ds.sel(eval(indexers))
+
+
+@pytest.fixture
+def catalog():
+    path = os.path.dirname(__file__)
+    return open_catalog(os.path.join(path, "data", "catalog.yaml"))
+
+
+def test_catalog(catalog):
+    expected = catalog["xarray_source"].read().sel(lat=20)
+    actual = catalog["xarray_source_sel"].read()
+    assert_allclose(actual, expected)