ExtensionSystem: Use TestCreator in more places

Amends b59e632ac3

Change-Id: I11000c488c6a69b4c55b8ccb164fa6587abb8b5b
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: hjk <hjk@qt.io>

src/libs/extensionsystem/iplugin.cpp

@@ -164,7 +164,7 @@ namespace Internal {
 class IPluginPrivate
 {
 public:
-    QList<std::function<QObject *()>> testCreators;
+    QList<TestCreator> testCreators;
 };
 
 } // Internal

src/libs/extensionsystem/iplugin.h

@@ -13,6 +13,8 @@ namespace ExtensionSystem {
 
 namespace Internal { class IPluginPrivate; }
 
+using TestCreator = std::function<QObject *()>;
+
 class EXTENSIONSYSTEM_EXPORT IPlugin : public QObject
 {
     Q_OBJECT
@@ -41,7 +43,6 @@ public:
 protected:
     virtual void initialize() {}
 
-    using TestCreator = std::function<QObject *()>;
     template <typename Test, typename ...Args>
     void addTest(Args && ...args) { addTestCreator([args...] { return new Test(args...); }); }
     void addTestCreator(const TestCreator &creator);

src/libs/extensionsystem/pluginspec_p.h

@@ -78,7 +78,7 @@ public:
     PluginSpec::PluginArgumentDescriptions argumentDescriptions;
     IPlugin *plugin = nullptr;
 
-    QList<std::function<QObject *()>> registeredPluginTests;
+    QList<TestCreator> registeredPluginTests;
 
     PluginSpec::State state = PluginSpec::Invalid;
     bool hasError = false;