diff --git a/pyasm/test.asm b/pyasm/test.asm
index a02aa42..2ac2037 100644
--- a/pyasm/test.asm
+++ b/pyasm/test.asm
@@ -1,21 +1,6 @@
-; a test comment on the first line
+; a very simple 'smoke-test' file
         org     0100
 
-start   law     10
-        lac     start2      ; comment
-        lac     .-2
-;        lac     undef       ; another comment
-        hlt
-
-fred    equ     2           ; EQU
-
-;        org     128 + 1
-        org     . + 010
-
-start2  
-        lac     start + 2   ; comment
-        nop
-string  data    'ascii'
-        hlt
+start   hlt
 
         end     start
diff --git a/pyasm/test2.asm b/pyasm/test2.asm
new file mode 100644
index 0000000..d12e091
--- /dev/null
+++ b/pyasm/test2.asm
@@ -0,0 +1,17 @@
+; a test comment on the first line
+        org     0100
+
+start   law     10
+        lac     start2      ; comment
+        lac     .-2
+        hlt
+
+fred    equ     2           ; EQU
+
+        org     . + 010
+start2  
+        lac     start + 2   ; comment
+string  data    'ascii'
+end     hlt
+
+        end     start
diff --git a/pyasm/test3.asm b/pyasm/test3.asm
new file mode 100644
index 0000000..922de58
--- /dev/null
+++ b/pyasm/test3.asm
@@ -0,0 +1,8 @@
+; a file containing an undef
+        org     0100
+
+start   law     10
+        lac     undef       ; another comment
+        hlt
+
+        end     start