Could it be?

internal/handler/message.go

@@ -46,11 +46,6 @@ type AddMessageResponse struct {
 // @Failure      500  {object}  AddMessageResponse
 // @Router       /message/new [post]
 func (m *MessageHandler) AddMessage(w http.ResponseWriter, r *http.Request) {
-	if r.Method != http.MethodPost {
-		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
-		return
-	}
-
 	var req RequestAddMessage
 	if err := ExtractFromRequest(r, &req); err != nil {
 		http.Error(w, "Invalid JSON: "+err.Error(), http.StatusBadRequest)

internal/store/mock/store.go

@@ -3,6 +3,7 @@ package mock
 import (
 	"context"
 	"errors"
+	"fmt"
 	"sync"
 
 	"git.kundeng.us/phoenix/textsender-models/tx0/message"
@@ -37,9 +38,13 @@ func (m *MockMessageStore) CreateMessage(ctx context.Context, msg *message.Messa
 	}
 
 	var id uuid.UUID
-	if msg.Id != nil && *msg.Id == uuid.Nil {
-		id = uuid.New()
-		msg.Id = &id
+	if msg != nil {
+		if msg.Id == nil || *msg.Id == uuid.Nil {
+			id = uuid.New()
+			msg.Id = &id
+		}
+	} else {
+		return fmt.Errorf("Message not populated")
 	}
 
 	key := MessageKey{Content: msg.Content, UserId: *msg.UserId}