Add more unit tests

backend/internal/entity/certificateauthority/model.go

@@ -41,15 +41,15 @@ func (m *Model) Save() error {
 	return result.Error
 }
 
-// Delete will mark row as deleted
-func (m *Model) Delete() bool {
+// Delete will mark a row as deleted
+func (m *Model) Delete() error {
 	if m.ID == 0 {
 		// Can't delete a new object
-		return false
+		return eris.New("Unable to delete a new object")
 	}
 	db := database.GetDB()
 	result := db.Delete(m)
-	return result.Error == nil
+	return result.Error
 }
 
 // Check will ensure the ca bundle path exists if it's set