diff --git a/tests/test_metrics.py b/tests/test_metrics.py
index b6e31d267..370a97a3b 100644
--- a/tests/test_metrics.py
+++ b/tests/test_metrics.py
@@ -110,6 +110,9 @@ class TestMetricsReproCLI(TestDvc):
         ret = main(['metrics', 'add', 'metrics'])
         self.assertEqual(ret, 0)
 
+        ret = main(['metrics', 'modify', '-t', 'csv', '-x', '0,0', 'metrics'])
+        self.assertEqual(ret, 0)
+
         ret = main(['repro', '-f', '-m', stage.path])
         self.assertEqual(ret, 0)
 
@@ -195,6 +198,9 @@ class TestMetricsCLI(TestMetrics):
         ret = main(['metrics', 'add', 'non-existing'])
         self.assertNotEqual(ret, 0)
 
+        ret = main(['metrics', 'modify', 'non-existing'])
+        self.assertNotEqual(ret, 0)
+
         ret = main(['metrics', 'remove', 'non-existing'])
         self.assertNotEqual(ret, 0)