1 files changed, 8 insertions, 1 deletions
diff --git a/tests/test_cmdline.py b/tests/test_cmdline.py
index 54d84197..b616ed51 100644
--- a/tests/test_cmdline.py
+++ b/tests/test_cmdline.py
@@ -213,13 +213,20 @@ class CmdLineTest(BaseCmdLineTest):
             """)
 
     def test_combine(self):
-        # coverage combine
+        # coverage combine with args
         self.cmd_executes("combine datadir1", """\
             .coverage()
             .load()
             .combine(["datadir1"])
             .save()
             """)
+        # coverage combine without args
+        self.cmd_executes("combine", """\
+            .coverage()
+            .load()
+            .combine(None)
+            .save()
+            """)
 
     def test_debug(self):
         self.cmd_help("debug", "What information would you like: data, sys?")