Add more test fixture files

test/fixtures/Foo.sig

@@ -0,0 +1,27 @@
+ 
+signature LAZY_BASE =
+   sig 
+      type 'a lazy
+      exception Undefined
+      val force: 'a lazy -> 'a
+      val delay: (unit -> 'a) -> 'a lazy
+      val undefined: 'a lazy
+   end
+
+signature LAZY' =
+   sig
+      include LAZY_BASE
+      val isUndefined: 'a lazy -> bool
+      val inject : 'a -> 'a lazy
+      val toString: ('a -> string) -> 'a lazy -> string
+      val eq: ''a lazy * ''a lazy -> bool
+      val eqBy: ('a * 'a -> bool) -> 'a lazy * 'a lazy -> bool
+      val compare: ('a * 'a -> order) -> 'a lazy * 'a lazy -> order
+      val map: ('a -> 'b) -> 'a lazy -> 'b lazy
+
+      structure Ops: 
+                   sig
+                      val ! : 'a lazy -> 'a (* force *)
+                      val ? : 'a -> 'a lazy (* inject *)
+                   end
+   end