feat(tests): add very basic ResourceModel test

______very_____ basic indeed, creating tests is super boring :c

Signed-off-by: flow <flowlnlnln@gmail.com>

tests/DummyResourceAPI.h

@@ -0,0 +1,47 @@
+#pragma once
+
+#include <QJsonDocument>
+
+#include <modplatform/ResourceAPI.h>
+
+class SearchTask : public Task {
+    Q_OBJECT
+
+   public:
+    void executeTask() override { emitSucceeded(); }
+};
+
+class DummyResourceAPI : public ResourceAPI {
+   public:
+    static auto searchRequestResult()
+    {
+        static QByteArray json_response =
+            "{\"hits\":["
+            "{"
+            "\"author\":\"flowln\","
+            "\"description\":\"the bestest mod\","
+            "\"project_id\":\"something\","
+            "\"project_type\":\"mod\","
+            "\"slug\":\"bip_bop\","
+            "\"title\":\"AAAAAAAA\","
+            "\"versions\":[\"2.71\"]"
+            "}"
+            "]}";
+
+        return QJsonDocument::fromJson(json_response);
+    }
+
+    DummyResourceAPI() : ResourceAPI() {}
+    [[nodiscard]] auto getSortingMethods() const -> QList<SortingMethod> override { return {}; };
+
+    [[nodiscard]] Task::Ptr searchProjects(SearchArgs&&, SearchCallbacks&& callbacks) const override
+    {
+        auto task = new SearchTask;
+        QObject::connect(task, &Task::succeeded, [=] {
+            auto json = searchRequestResult();
+            callbacks.on_succeed(json);
+        });
+        QObject::connect(task, &Task::finished, task, &Task::deleteLater);
+        return task;
+    }
+};