add testify

Author: CC11001100

go.mod

@@ -2,4 +2,11 @@ module github.com/compression-algorithm-research-lab/go-varint
 
 go 1.18
 
-require github.com/golang-infrastructure/go-gtypes v0.0.1 // indirect
+require github.com/golang-infrastructure/go-gtypes v0.0.1
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/stretchr/testify v1.9.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)