test: add test case

utils/metric/date_counter_test.go

@@ -0,0 +1,27 @@
+package metric
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDateCounter(t *testing.T) {
+	assert := assert.New(t)
+
+	dc := NewDateCounter(3)
+	dc.Inc(10)
+	assert.EqualValues(10, dc.TodayCount())
+
+	dc.Dec(5)
+	assert.EqualValues(5, dc.TodayCount())
+
+	counts := dc.GetLastDaysCount(3)
+	assert.EqualValues(3, len(counts))
+	assert.EqualValues(5, counts[0])
+	assert.EqualValues(0, counts[1])
+	assert.EqualValues(0, counts[2])
+
+	dcTmp := dc.Snapshot()
+	assert.EqualValues(5, dcTmp.TodayCount())
+}