add unit test

Signed-off-by: lhy1024 <[email protected]>

pkg/statistics/hot_cache_test.go

@@ -0,0 +1,36 @@
+// Copyright 2024 TiKV Project Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package statistics
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"github.com/tikv/pd/pkg/statistics/utils"
+)
+
+func TestIsHot(t *testing.T) {
+	re := require.New(t)
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	cache := NewHotCache(ctx)
+	region := buildRegion(utils.Read, 3, 60)
+	stats := cache.CheckReadPeerSync(region, region.GetPeers(), []float64{100000000, 1000, 1000}, 60)
+	cache.Update(stats[0], utils.Read)
+	for i := 0; i < 100; i++ {
+		re.True(cache.IsRegionHot(region, 1))
+	}
+}