Add unit tests for mmd and guarded mmd

unittests/mmd1.chai

@@ -0,0 +1,20 @@
+def bob(x, y, z) {
+	x + y + z
+}
+
+def bob(x, y) {
+	x - y
+}
+
+def bob(x) {
+	-x
+}
+
+def bob() {
+	10
+}
+
+print(bob())
+print(bob(5))
+print(bob(5,6))
+print(bob(5,6,7))

unittests/mmd1.txt

@@ -0,0 +1,4 @@
+10
+-5
+-1
+18

unittests/mmd2.chai

@@ -0,0 +1,9 @@
+def bob(x, y) : x > 10 { x - y }
+
+def bob(x, y) : x > 5 { x - y + 10 }
+
+def bob(x, y) { x + y }
+
+print(bob(3, 4))
+print(bob(6, 7))
+print(bob(11, 12))

unittests/mmd2.txt

@@ -0,0 +1,3 @@
+7
+9
+-1