Harden emote parsing (#3885)

src/providers/twitch/TwitchEmotes.hpp

@@ -33,13 +33,23 @@ struct CheerEmoteSet {
     std::vector<CheerEmote> cheerEmotes;
 };
 
-class TwitchEmotes
+class ITwitchEmotes
+{
+public:
+    virtual ~ITwitchEmotes() = default;
+
+    virtual EmotePtr getOrCreateEmote(const EmoteId &id,
+                                      const EmoteName &name) = 0;
+};
+
+class TwitchEmotes : public ITwitchEmotes
 {
 public:
     static QString cleanUpEmoteCode(const QString &dirtyEmoteCode);
-    TwitchEmotes();
+    TwitchEmotes() = default;
 
-    EmotePtr getOrCreateEmote(const EmoteId &id, const EmoteName &name);
+    EmotePtr getOrCreateEmote(const EmoteId &id,
+                              const EmoteName &name) override;
 
 private:
     Url getEmoteLink(const EmoteId &id, const QString &emoteScale);