Added dkim selector mock endpoint

go.sum

@@ -18,6 +18,8 @@ github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742 h1:Esafd1046DLD
 github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
 github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=

mock_domains.go

@@ -97,6 +97,7 @@ func (ms *MockServer) addDomainRoutes(r chi.Router) {
 	r.Put("/domains/{domain}/tracking/open", ms.updateOpenTracking)
 	r.Put("/domains/{domain}/tracking/unsubscribe", ms.updateUnsubTracking)
 	r.Get("/domains/{domain}/limits/tag", ms.getTagLimits)
+	r.Put("/domains/{domain}/dkim_selector", ms.updateDKIMSelector)
 }
 
 func (ms *MockServer) listDomains(w http.ResponseWriter, r *http.Request) {
@@ -281,3 +282,18 @@ func (ms *MockServer) getTagLimits(w http.ResponseWriter, r *http.Request) {
 	w.WriteHeader(http.StatusNotFound)
 	toJSON(w, okResp{Message: "domain not found"})
 }
+
+func (ms *MockServer) updateDKIMSelector(w http.ResponseWriter, r *http.Request) {
+	for _, d := range ms.domainList {
+		if d.Domain.Name == chi.URLParam(r, "domain") {
+			if r.FormValue("dkim_selector") == "" {
+				toJSON(w, okResp{Message: "dkim_selector param required"})
+				return
+			}
+			toJSON(w, okResp{Message: "updated dkim selector"})
+			return
+		}
+	}
+	w.WriteHeader(http.StatusNotFound)
+	toJSON(w, okResp{Message: "domain not found"})
+}