Fix SystemComponent unit tests

Turns SystemComponent::extractBaseUrl() into a static method so that the unit tests pass when run locally.

Author: MrEricSir

src/system/SystemComponent.h

@@ -44,7 +44,7 @@ class SystemComponent : public ComponentBase
   Q_INVOKABLE void cancelServerConnectivity();
   Q_SIGNAL void serverConnectivityResult(QString url, bool success, QString resolvedUrl);
 
-  QString extractBaseUrl(const QString& url);
+  static QString extractBaseUrl(const QString& url);
   void resolveUrl(const QString& url, std::function<void(const QString&)> callback);
 
   Q_INVOKABLE QString getUserAgent();

tests/test_systemcomponent.cpp

@@ -141,8 +141,7 @@ void TestSystemComponent::testExtractBaseUrl()
   QFETCH(QString, input);
   QFETCH(QString, expected);
 
-  SystemComponent* component = &SystemComponent::Get();
-  QString result = component->extractBaseUrl(input);
+  QString result = SystemComponent::extractBaseUrl(input);
 
   QCOMPARE(result, expected);
 }