diff --git a/taxcalc/tests/test_growfactors.py b/taxcalc/tests/test_growfactors.py
index 8c4771b8b..5e0e7d163 100644
--- a/taxcalc/tests/test_growfactors.py
+++ b/taxcalc/tests/test_growfactors.py
@@ -32,6 +32,8 @@ def test_improper_usage(bad_gf_file):
     """
     with pytest.raises(ValueError):
         gfo = GrowFactors(dict())
+    with pytest.raises(ValueError):
+        gfo = GrowFactors('non_existent_file.csv')
     with pytest.raises(ValueError):
         gfo = GrowFactors(bad_gf_file.name)
     gfo = GrowFactors()