statistics: add more tests for init stats

Signed-off-by: Weizhen Wang <wangweizhen@pingcap.com>

pkg/statistics/handle/initstats/BUILD.bazel

@@ -1,4 +1,4 @@
-load("@io_bazel_rules_go//go:def.bzl", "go_library")
+load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
 
 go_library(
     name = "initstats",
@@ -16,3 +16,18 @@ go_library(
         "@org_uber_go_zap//:zap",
     ],
 )
+
+go_test(
+    name = "initstats_test",
+    timeout = "short",
+    srcs = [
+        "load_stats_test.go",
+        "main_test.go",
+    ],
+    embed = [":initstats"],
+    flaky = True,
+    deps = [
+        "//pkg/testkit/testsetup",
+        "@org_uber_go_goleak//:goleak",
+    ],
+)

pkg/statistics/handle/initstats/load_stats_test.go

@@ -0,0 +1,15 @@
+// Copyright 2024 PingCAP, Inc.
+//
+// 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 initstats

pkg/statistics/handle/initstats/main_test.go

@@ -0,0 +1,34 @@
+// Copyright 2024 PingCAP, Inc.
+//
+// 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 initstats
+
+import (
+	"testing"
+
+	"github.com/pingcap/tidb/pkg/testkit/testsetup"
+	"go.uber.org/goleak"
+)
+
+func TestMain(m *testing.M) {
+	opts := []goleak.Option{
+		goleak.IgnoreTopFunction("github.com/golang/glog.(*fileSink).flushDaemon"),
+		goleak.IgnoreTopFunction("github.com/bazelbuild/rules_go/go/tools/bzltestutil.RegisterTimeoutHandler.func1"),
+		goleak.IgnoreTopFunction("github.com/lestrrat-go/httprc.runFetchWorker"),
+		goleak.IgnoreTopFunction("go.etcd.io/etcd/client/pkg/v3/logutil.(*MergeLogger).outputLoop"),
+		goleak.IgnoreTopFunction("go.opencensus.io/stats/view.(*worker).start"),
+	}
+	testsetup.SetupForCommonTest()
+	goleak.VerifyTestMain(m, opts...)
+}