add calculate and merge coverage files

go.mod

@@ -10,6 +10,7 @@ require (
 	github.com/jackc/pgx/v4 v4.12.1-0.20210724153913-640aa07df17c
 	github.com/jmoiron/sqlx v1.3.1
 	github.com/pkg/errors v0.9.1
+	github.com/stretchr/testify v1.8.3
 	go.unistack.org/micro-client-http/v4 v4.0.2
 	go.unistack.org/micro-codec-json/v4 v4.0.0
 	go.unistack.org/micro-codec-jsonpb/v4 v4.0.0
@@ -25,6 +26,7 @@ require (
 	go.unistack.org/protoc-gen-go-micro/v4 v4.0.7
 	golang.org/x/mod v0.12.0
 	golang.org/x/sync v0.3.0
+	golang.org/x/tools v0.11.0
 	google.golang.org/protobuf v1.31.0
 	modernc.org/sqlite v1.21.0
 )
@@ -37,6 +39,7 @@ require (
 	github.com/acomagu/bufpipe v1.0.4 // indirect
 	github.com/cenkalti/backoff/v3 v3.2.2 // indirect
 	github.com/cloudflare/circl v1.3.3 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/emirpasic/gods v1.18.1 // indirect
 	github.com/fatih/structtag v1.2.0 // indirect
@@ -76,6 +79,7 @@ require (
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
 	github.com/patrickmn/go-cache v2.1.0+incompatible // indirect
 	github.com/pjbgf/sha1cd v0.3.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
 	github.com/rs/zerolog v1.30.0 // indirect
 	github.com/ryanuber/go-glob v1.0.0 // indirect
@@ -92,7 +96,6 @@ require (
 	golang.org/x/sys v0.11.0 // indirect
 	golang.org/x/text v0.12.0 // indirect
 	golang.org/x/time v0.3.0 // indirect
-	golang.org/x/tools v0.11.0 // indirect
 	gopkg.in/warnings.v0 v0.1.2 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect