diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 7bd5b4a3..77f56014 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -18,6 +18,12 @@ jobs:
         platform: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.platform }}
     steps:
+      - if: ${{ runner.os == 'Windows' }}
+        name: Use GNU tar for faster cache restore
+        shell: cmd
+        run: |
+          echo "Adding GNU tar to PATH"
+          echo C:\Program Files\Git\usr\bin>>"%GITHUB_PATH%"
       - name: "checkout repo"
         uses: actions/checkout@v3
         with:
diff --git a/.gitignore b/.gitignore
index e613cd38..603023e6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,4 +7,4 @@ test
 vendor
 work
 .vscode/
-.coverage*
+.cover*
diff --git a/Makefile b/Makefile
index 2d2729a9..d190c1cf 100644
--- a/Makefile
+++ b/Makefile
@@ -35,19 +35,24 @@ default: cmd
 
 cmd: $(EXECUTABLE_TARGETS)
 
-build:
+build: cmd
 	go build $(BUILDFLAGS) ./...
+	cd lib && go build $(BUILDFLAGS) ./...
 
 cmd_%: OUTPUT=$(patsubst cmd_%,./bin/%,$@)
 cmd_%: SOURCE=$(patsubst cmd_%,./cmd/%,$@)
 cmd_%:
 	go build $(BUILDFLAGS) -o $(OUTPUT) $(SOURCE)
 
-test:
-	go test -coverprofile=.coverage.out ./...
-	go tool cover -func=.coverage.out -o .coverage.func
-	tail -1 .coverage.func
-	go tool cover -html=.coverage.out -o .coverage.html
+test: ./bin/gocovmerge
+	go test -coverprofile=.cover.pkg ./...
+	cd lib && go test -coverprofile=../.cover.lib ./...
+	./bin/gocovmerge .cover.* > .cover
+	rm .cover.*
+	go tool cover -html=.cover -o .cover.html
+
+./bin/gocovmerge:
+	GOBIN=$(GOBIN) go install github.com/wadey/gocovmerge@master
 
 docker:
 	docker build $(DOCKERFLAG) -t "tiproxy:${IMAGE_TAG}" --build-arg='GOPROXY=$(shell go env GOPROXY),BUILDFLAGS=$(BUILDFLAGS),' -f docker/Dockerfile .
diff --git a/lib/config/namespace_test.go b/lib/config/namespace_test.go
index 3b393874..003e27bc 100644
--- a/lib/config/namespace_test.go
+++ b/lib/config/namespace_test.go
@@ -1,3 +1,17 @@
+// Copyright 2022 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 config
 
 import (
diff --git a/lib/config/proxy_test.go b/lib/config/proxy_test.go
index bdafaa2b..bb0fb41b 100644
--- a/lib/config/proxy_test.go
+++ b/lib/config/proxy_test.go
@@ -1,7 +1,20 @@
+// Copyright 2022 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 config
 
 import (
-	"net/url"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -9,16 +22,10 @@ import (
 
 var testProxyConfig = Config{
 	Workdir: "./wd",
-	LCUrlsI: []string{"http://0.0.0.0:3080"},
-	ACUrlsI: []string{},
-	LPUrlsI: []string{"http://0.0.0.0:3081"},
-	APUrlsI: []string{},
-	LCUrls:  []url.URL{},
-	ACUrls:  []url.URL{},
-	LPUrls:  []url.URL{},
-	APUrls:  []url.URL{},
-	Config: ConfigManager{
+	Advance: Advance{
+		PeerPort:             "343",
 		IgnoreWrongNamespace: true,
+		WatchInterval:        "30m",
 	},
 	Proxy: ProxyServer{
 		Addr:    "0.0.0.0:4000",
@@ -29,13 +36,12 @@ var testProxyConfig = Config{
 		},
 	},
 	API: API{
+		Addr:            "0.0.0.0:3080",
 		EnableBasicAuth: false,
 		User:            "user",
 		Password:        "pwd",
 	},
-	Metrics: Metrics{
-		PromCluster: "ffgfg",
-	},
+	Metrics: Metrics{},
 	Log: Log{
 		Level:   "info",
 		Encoder: "tidb",