fix: add test file comment
diff --git a/test/integrate/dubbo/go-client/go.mod b/test/integrate/dubbo/go-client/go.mod
index 95a0449..4c8ca0f 100644
--- a/test/integrate/dubbo/go-client/go.mod
+++ b/test/integrate/dubbo/go-client/go.mod
@@ -3,6 +3,10 @@
 go 1.13
 
 require (
+	// useless dubbo-go version number, it will be replaced when run by this Docker file: ../Dockerfile:
+	//```
+	// RUN test ${PR_ORIGIN_REPO} && go mod edit  -replace=github.com/apache/dubbo-go=github.com/${PR_ORIGIN_REPO}@${PR_ORIGIN_COMMITID} || go get -u github.com/apache/dubbo-go@develop
+	//```
 	github.com/apache/dubbo-go v1.5.5
 	github.com/apache/dubbo-go-hessian2 v1.9.1
 )
diff --git a/test/integrate/dubbo/go-server/go.mod b/test/integrate/dubbo/go-server/go.mod
index 0de92a4..a51e9fc 100644
--- a/test/integrate/dubbo/go-server/go.mod
+++ b/test/integrate/dubbo/go-server/go.mod
@@ -3,6 +3,10 @@
 go 1.13
 
 require (
+	// useless dubbo-go version number, it will be replaced when run by this Docker file: ../Dockerfile:
+	//```
+	// RUN test ${PR_ORIGIN_REPO} && go mod edit  -replace=github.com/apache/dubbo-go=github.com/${PR_ORIGIN_REPO}@${PR_ORIGIN_COMMITID} || go get -u github.com/apache/dubbo-go@develop
+	//```
 	github.com/apache/dubbo-go v1.5.5
 	github.com/apache/dubbo-go-hessian2 v1.9.1
 )