address comments

Signed-off-by: 5kbpers <tangminghua@pingcap.com>

server/api/admin_test.go

@@ -92,9 +92,9 @@ type testTSOSuite struct {
 	urlPrefix string
 }
 
-func makeTS(offset time.Duration) int64 {
+func makeTS(offset time.Duration) uint64 {
 	physical := time.Now().Add(offset).UnixNano() / int64(time.Millisecond)
-	return physical << 18
+	return uint64(physical << 18)
 }
 
 func (s *testTSOSuite) SetUpSuite(c *C) {
@@ -115,7 +115,7 @@ func (s *testTSOSuite) TestResetTS(c *C) {
 	args := make(map[string]interface{})
 	t1 := makeTS(time.Hour)
 	url := s.urlPrefix
-	args["tso"] = fmt.Sprintf("%d", uint64(t1))
+	args["tso"] = fmt.Sprintf("%d", t1)
 	values, err := json.Marshal(args)
 	c.Assert(err, IsNil)
 	err = postJSON(url, values,
@@ -126,7 +126,7 @@ func (s *testTSOSuite) TestResetTS(c *C) {
 
 	c.Assert(err, IsNil)
 	t2 := makeTS(32 * time.Hour)
-	args["tso"] = fmt.Sprintf("%d", uint64(t2))
+	args["tso"] = fmt.Sprintf("%d", t2)
 	values, err = json.Marshal(args)
 	c.Assert(err, IsNil)
 	err = postJSON(url, values,
@@ -135,16 +135,16 @@ func (s *testTSOSuite) TestResetTS(c *C) {
 	c.Assert(strings.Contains(err.Error(), "too large"), IsTrue)
 
 	t3 := makeTS(-2 * time.Hour)
-	args["tso"] = fmt.Sprintf("%d", uint64(t3))
+	args["tso"] = fmt.Sprintf("%d", t3)
 	values, err = json.Marshal(args)
 	c.Assert(err, IsNil)
 	err = postJSON(url, values,
 		func(_ []byte, code int) { c.Assert(code, Equals, http.StatusForbidden) })
 	c.Assert(err, NotNil)
 	c.Assert(strings.Contains(err.Error(), "small"), IsTrue)
 
-	t4 := math.MinInt64
-	args["tso"] = fmt.Sprintf("%d", uint64(t4))
+	t4 := uint64(math.MinInt64)
+	args["tso"] = fmt.Sprintf("%d", t4)
 	values, err = json.Marshal(args)
 	c.Assert(err, IsNil)
 	err = postJSON(url, values,