add e2e tests

go.mod

@@ -5,9 +5,13 @@ go 1.13
 require (
 	github.com/aws/aws-sdk-go v1.29.13
 	github.com/deckarep/golang-set v1.7.1
+	github.com/evanphx/json-patch v4.2.0+incompatible
 	github.com/golang/groupcache v0.0.0-20190129154638-5b532d6fd5ef // indirect
 	github.com/googleapis/gnostic v0.2.0 // indirect
 	github.com/imdario/mergo v0.3.7 // indirect
+	github.com/onsi/ginkgo v1.10.1
+	github.com/onsi/gomega v1.7.0
+	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v0.9.2
 	github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910
 	github.com/spf13/cobra v0.0.5