test(core): add more tests

Author: gjasny

core/tests/check_label_name_test.cc

@@ -30,6 +30,9 @@ TEST_P(CheckLabelNameTest, trailing_invalid_label_name) {
 TEST_P(CheckLabelNameTest, good_label_name) {
   EXPECT_TRUE(CheckLabelName("type"));
 }
+TEST_P(CheckLabelNameTest, numeric_label_name) {
+  EXPECT_FALSE(CheckLabelName("2unlimited"));
+}
 TEST_P(CheckLabelNameTest, reserved_label_name) {
   EXPECT_FALSE(CheckLabelName("__some_reserved_label"));
 }

core/tests/check_metric_name_test.cc

@@ -11,6 +11,9 @@ TEST(CheckMetricNameTest, empty_metric_name) {
 TEST(CheckMetricNameTest, good_metric_name) {
   EXPECT_TRUE(CheckMetricName("prometheus_notifications_total"));
 }
+TEST(CheckMetricNameTest, numeric_metric_name) {
+  EXPECT_FALSE(CheckMetricName("2unlimited"));
+}
 TEST(CheckMetricNameTest, reserved_metric_name) {
   EXPECT_FALSE(CheckMetricName("__some_reserved_metric"));
 }