Add more branchless functions

branchless.py

@@ -1,3 +1,6 @@
+Sgn = lambda a: 1 * (a > 0) + (-1) * (a <= 0) 
+Abs = lambda a: a * (a > 0) + (-a) * (a <= 0)
+
 Min = lambda a,b: a * (a < b) + b * (b <= a)
 Max = lambda a,b: a * (a > b) + b * (b >= a)
 
@@ -9,12 +12,16 @@
 
 
 def test():
-  print(Min(3,10))
-  print(Max(3,10))
-  print(Upper("dario"))
-  print(Upper2("dario"))
-  print(Lower("DARIO"))
-  print(Lower2("DARIO"))
+  assert(Sgn(-3) == -1)
+  assert(Sgn(3) == 1)
+  assert(Abs(-3) == 3)
+  assert(Abs(3) == 3)
+  assert(Min(3,10) == 3)
+  assert(Max(3,10) == 10)
+  assert(Upper("dario"))
+  assert(Upper2("dario"))
+  assert(Lower("DARIO"))
+  assert(Lower2("DARIO"))
 
 
 test()