Added more tests

tests/programs/negative.q

@@ -1,5 +1,17 @@
 main() {
-	a := -32
-	b := 64
-	assert a + b == 32
+	a := -1
+	b := -2
+	assert a == -1
+	assert a != 0xFF
+	assert a != 0xFFFF
+	assert a != 0xFFFFFFFF
+	assert b == -2
+	assert b != 0xFE
+	assert b != 0xFFFE
+	assert b != 0xFFFFFFFE
+	assert a + b == -3
+	assert a - b == 1
+	assert a * b == 2
+	assert a / b == 0
+	assert a % b == -1
 }