Check time order explicitly (#37)

* Add sortable test (#11)

* add TestSortableID to make sure that generated ID(s) can be sorted like you are using increment id database

* add TestSortableID to make sure that generated ID(s) can be sorted like you are using increment id database

Co-authored-by: Yoshiyuki Mineo <Yoshiyuki.Mineo@jp.sony.com>

* gofmt

* Check time order explicitly

Co-authored-by: Yusuf Syaifudin <yusuf.syaifudin@gmail.com>

sonyflake_test.go

@@ -76,9 +76,12 @@ func TestSonyflakeFor10Sec(t *testing.T) {
 		parts := Decompose(id)
 		numID++
 
-		if id <= lastID {
+		if id == lastID {
 			t.Fatal("duplicated id")
 		}
+		if id < lastID {
+			t.Fatal("must increase with time")
+		}
 		lastID = id
 
 		current = currentTime()