diff --git a/tests/test_get_godag.py b/tests/test_get_godag.py
index a6a8ea5..12d58cb 100755
--- a/tests/test_get_godag.py
+++ b/tests/test_get_godag.py
@@ -5,14 +5,29 @@
 import sys
 from goatools.base import get_godag
 
+
 def test_godag(prt=sys.stdout):
-    """Test downloading GO DAG."""
+    """
+    Test downloading GO DAG.
+    """
     cwd = os.getcwd()
-    for fin_obo in ['go-basic.obo', 'goslim_generic.obo']:
+    for fin_obo in ["go-basic.obo", "goslim_generic.obo"]:
         fin_full = os.path.join(cwd, fin_obo)
         os.system("rm -f {OBO}".format(OBO=fin_obo))
-        godag = get_godag(fin_full, prt, loading_bar=None) # Get GODag object
+        godag = get_godag(fin_full, prt, loading_bar=None)  # Get GODag object
         assert godag, "GO-DAG({OBO}) NOT PROPERLY LOADED".format(OBO=fin_obo)
 
-if __name__ == '__main__':
+
+def test_godag_ecs():
+    """
+    Test downloading GO DAG and extract ECs.
+    """
+    godag = get_godag("go-basic.obo", optional_attrs="xref")
+    go = godag["GO:0000010"]
+    ecs = [x for x in go.xref if x.startswith("EC:")]
+    assert "EC:2.5.1.30" in ecs
+
+
+if __name__ == "__main__":
     test_godag()
+    test_godag_ecs()