diff --git a/src/testgen/core.clj b/src/testgen/core.clj
index ebd0357..005c7b3 100644
--- a/src/testgen/core.clj
+++ b/src/testgen/core.clj
@@ -5,5 +5,32 @@
      	(list 'is (list '= (list fnname arg) (eval (list fnname arg))))
 	(catch Exception e (list 'is (list 'thrown? (.getClass e) (list fnname arg))))))
 
+(defn constant? [arg]
+	(not (or
+		(symbol? arg)
+		(seq? arg)
+		(vector? arg)
+		(map? arg))))
+
+(def generic-args nil () true "test" :test 0 Integer/MAX_VALUE 0.0001 -0.0001)
+
+(defn find-interesting-args [sexpr]
+	"Find things in sexpr which would be interesting if passed as arguments to it"
+	(filter constant? (flatten sexpr)))
+
+(defn find-more-interesting-args [sexpr]
+	"Find things in sexpr which would be even more interesting if passed as arguments to it"
+	(concat generic-args
+		(flatten 
+			(map 
+				#(cond 
+					(number? %) (list % (inc %) (dec %)) 
+					true %) 
+				(find-interesting-args sexpr))))
+
+(defn testgen [fndef] 
+	(cond (= (first fndef) 'defn)
+		(let [name (first (rest fndef))]
+			(list 'deftest (symbol (str "test-" name))
+				(map #(write-test name %) (find-more-interesting-args fndef))))))
 
-(defn testgen [fndef] nil)