Move test cases to test dir

src/timestamp/test/gtest_timestamp.cpp

@@ -0,0 +1,28 @@
+#include <gtest/gtest.h>
+
+#include "timestamp.h"
+
+TEST(TIMESTAMP, GET)
+{
+    uint64_t sec = 0;
+    uint64_t msec = 0;
+
+    for (int i = 0; i < 4; i++)
+    {
+        timestamp_update();
+        sec = timestamp_get_sec();
+        msec = timestamp_get_msec();
+
+        printf("current ts in sec  : %lu\n", sec);
+        printf("current ts in msec : %lu\n", msec);
+        EXPECT_TRUE(sec == msec / 1000);
+        sleep(i);
+        printf("sleep %ds\n", i);
+    }
+}
+
+int main(int argc, char **argv)
+{
+    ::testing::InitGoogleTest(&argc, argv);
+    return RUN_ALL_TESTS();
+}