diff --git a/testdata/algo/nreader23.cir b/testdata/algo/nreader23.cir
new file mode 100644
index 000000000..e14f5ee62
--- /dev/null
+++ b/testdata/algo/nreader23.cir
@@ -0,0 +1,8 @@
+* Test
+
+MM1 O I VDD VDD pfet
+MM2 O I VSS VSS nfet
+XDUMMY O I doesnotexist
+
+.end
+