Added assertions to most tests

tests/programs/bitwise-xor.q

@@ -1,61 +1,16 @@
-import sys
-
 main() {
-	if 0 ^ 0 != 0 {
-		sys.exit(1)
-	}
-
-	if 0 ^ 1 != 1 {
-		sys.exit(2)
-	}
-
-	if 1 ^ 0 != 1 {
-		sys.exit(3)
-	}
-
-	if 1 ^ 1 != 0 {
-		sys.exit(4)
-	}
-
-	if 1 ^ 2 != 3 {
-		sys.exit(5)
-	}
-
-	if 1 ^ 3 != 2 {
-		sys.exit(6)
-	}
-
-	if 2 ^ 0 != 2 {
-		sys.exit(7)
-	}
-
-	if 2 ^ 1 != 3 {
-		sys.exit(8)
-	}
-
-	if 2 ^ 2 != 0 {
-		sys.exit(9)
-	}
-
-	if 2 ^ 3 != 1 {
-		sys.exit(10)
-	}
-
-	if 3 ^ 0 != 3 {
-		sys.exit(11)
-	}
-
-	if 3 ^ 1 != 2 {
-		sys.exit(12)
-	}
-
-	if 3 ^ 2 != 1 {
-		sys.exit(13)
-	}
-
-	if 3 ^ 3 != 0 {
-		sys.exit(14)
-	}
-
-	sys.exit(0)
+	assert 0 ^ 0 == 0
+	assert 0 ^ 1 == 1
+	assert 1 ^ 0 == 1
+	assert 1 ^ 1 == 0
+	assert 1 ^ 2 == 3
+	assert 1 ^ 3 == 2
+	assert 2 ^ 0 == 2
+	assert 2 ^ 1 == 3
+	assert 2 ^ 2 == 0
+	assert 2 ^ 3 == 1
+	assert 3 ^ 0 == 3
+	assert 3 ^ 1 == 2
+	assert 3 ^ 2 == 1
+	assert 3 ^ 3 == 0
 }