Added more tests

tests/programs/factorial.q

@@ -0,0 +1,23 @@
+main() {
+	for i := 0..10 {
+		assert fac1(i) == fac2(i)
+	}
+}
+
+fac1(n int) -> int {
+	x := 1
+
+	for i := 1..n+1 {
+		x = x * i
+	}
+
+	return x
+}
+
+fac2(n int) -> int {
+	if n <= 1 {
+		return 1
+	}
+
+	return n * fac2(n - 1)
+}