diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
index 0c5d3e0a7c..5ce1a142f9 100644
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -1,5 +1,5 @@
 <!--  Thanks for sending a pull request!
-Read https://github.com/apache/dubbo-go/blob/master/contributing.md before commit pull request.
+Read https://github.com/apache/dubbo-go/blob/master/CONTRIBUTING.md before commit pull request.
 -->
 
 **What this PR does**:
diff --git a/protocol/protocolwrapper/protocol_filter_wrapper_test.go b/protocol/protocolwrapper/protocol_filter_wrapper_test.go
index 842531ff8f..2400058e56 100644
--- a/protocol/protocolwrapper/protocol_filter_wrapper_test.go
+++ b/protocol/protocolwrapper/protocol_filter_wrapper_test.go
@@ -36,13 +36,15 @@ import (
 	"dubbo.apache.org/dubbo-go/v3/protocol"
 )
 
+const mockFilterKey = "mockEcho"
+
 func TestProtocolFilterWrapperExport(t *testing.T) {
 	filtProto := extension.GetProtocol(FILTER)
 	filtProto.(*ProtocolFilterWrapper).protocol = &protocol.BaseProtocol{}
 
 	u := common.NewURLWithOptions(
 		common.WithParams(url.Values{}),
-		common.WithParamsValue(constant.SERVICE_FILTER_KEY, "echo "))
+		common.WithParamsValue(constant.SERVICE_FILTER_KEY, mockFilterKey))
 	exporter := filtProto.Export(protocol.NewBaseInvoker(u))
 	_, ok := exporter.GetInvoker().(*FilterInvoker)
 	assert.True(t, ok)
@@ -54,15 +56,15 @@ func TestProtocolFilterWrapperRefer(t *testing.T) {
 
 	u := common.NewURLWithOptions(
 		common.WithParams(url.Values{}),
-		common.WithParamsValue(constant.REFERENCE_FILTER_KEY, " echo"))
+		common.WithParamsValue(constant.REFERENCE_FILTER_KEY, mockFilterKey))
 	invoker := filtProto.Refer(u)
 	_, ok := invoker.(*FilterInvoker)
 	assert.True(t, ok)
 }
 
-// the same as echo filter, for test
+// The initialization of mockEchoFilter, for test
 func init() {
-	extension.SetFilter("echo", newFilter)
+	extension.SetFilter(mockFilterKey, newFilter)
 }
 
 type mockEchoFilter struct{}