feat: add snapshot tests for eventsub messages (#5965)

mocks/include/mocks/TwitchIrcServer.hpp

@@ -9,6 +9,7 @@
 #include "providers/seventv/SeventvEmotes.hpp"
 #include "providers/twitch/TwitchChannel.hpp"
 #include "providers/twitch/TwitchIrcServer.hpp"
+#include "util/Twitch.hpp"
 
 #include <unordered_map>
 
@@ -45,8 +46,19 @@ public:
 
     ChannelPtr getChannelOrEmpty(const QString &dirtyChannelName) override
     {
-        assert(false && "unimplemented getChannelOrEmpty in mock irc server");
-        return {};
+        QString query = cleanChannelName(dirtyChannelName);
+
+        auto it = this->mockChannels.find(query);
+        if (it == this->mockChannels.end())
+        {
+            return Channel::getEmpty();
+        }
+        auto chan = it->second.lock();
+        if (!chan)
+        {
+            return Channel::getEmpty();
+        }
+        return chan;
     }
 
     void addFakeMessage(const QString &data) override