chore: use golden file for tests (#211)

Modifying existing tests for alerts and rules endpoints is very tedious
as you need to do lots of manual edits. This change relies on golden
files which can be automatically updated as the reponse payload evolves.

Signed-off-by: Simon Pasquier <spasquie@redhat.com>

go.mod

@@ -14,6 +14,7 @@ require (
 	github.com/prometheus/client_golang v1.19.0
 	github.com/prometheus/prometheus v0.50.1
 	golang.org/x/exp v0.0.0-20240119083558-1b970713d09a
+	gotest.tools/v3 v3.5.1
 )
 
 require (
@@ -33,6 +34,7 @@ require (
 	github.com/go-openapi/spec v0.21.0 // indirect
 	github.com/go-openapi/swag v0.23.0 // indirect
 	github.com/go-openapi/validate v0.24.0 // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/grafana/regexp v0.0.0-20221122212121-6b5c0a4cb7fd // indirect
 	github.com/josharian/intern v1.0.0 // indirect

go.sum

@@ -235,6 +235,8 @@ gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gotest.tools/v3 v3.5.1 h1:EENdUnS3pdur5nybKYIh2Vfgc8IUNBjxDPSjtiJcOzU=
+gotest.tools/v3 v3.5.1/go.mod h1:isy3WKz7GK6uNw/sbHzfKBLvlvXwUyV06n6brMxxopU=
 k8s.io/apimachinery v0.28.6 h1:RsTeR4z6S07srPg6XYrwXpTJVMXsjPXn0ODakMytSW0=
 k8s.io/apimachinery v0.28.6/go.mod h1:QFNX/kCl/EMT2WTSz8k4WLCv2XnkOLMaL8GAVRMdpsA=
 k8s.io/client-go v0.28.6 h1:Gge6ziyIdafRchfoBKcpaARuz7jfrK1R1azuwORIsQI=