diff --git a/netlib/debug.py b/netlib/debug.py
index ca25b8287..bf446eb03 100644
--- a/netlib/debug.py
+++ b/netlib/debug.py
@@ -12,15 +12,18 @@ def sysinfo():
         "Platform: %s"%platform.platform(),
     ]
     d = platform.linux_distribution()
-    if d[0]:
-        data.append("Linux distro: %s %s %s"%d)
+    t = "Linux distro: %s %s %s"%d
+    if d[0]: # pragma: no-cover
+        data.append(t)
 
     d = platform.mac_ver()
-    if d[0]:
-        data.append("Mac version: %s %s %s"%d)
+    t = "Mac version: %s %s %s"%d
+    if d[0]: # pragma: no-cover
+        data.append(t)
 
     d = platform.win32_ver()
-    if d[0]:
-        data.append("Windows version: %s %s %s %s"%d)
+    t = "Windows version: %s %s %s %s"%d
+    if d[0]: # pragma: no-cover
+        data.append(t)
 
     return "\n".join(data)
diff --git a/test/netlib/test_debug.py b/test/netlib/test_debug.py
new file mode 100644
index 000000000..d174bb5fd
--- /dev/null
+++ b/test/netlib/test_debug.py
@@ -0,0 +1,6 @@
+
+from netlib import debug
+
+
+def test_sysinfo():
+    assert debug.sysinfo()