add a trivial test for local lister

to demonstrate that its threading works as well as have a tiny example
to debug if things end up not working in the future

autotests/CMakeLists.txt

@@ -21,3 +21,4 @@ file(CREATE_LINK ${CMAKE_CURRENT_BINARY_DIR}/iterator-tree/bar ${CMAKE_CURRENT_B
 configure_file(test-config.h.cmake ${CMAKE_CURRENT_BINARY_DIR}/test-config.h)
 
 ecm_add_test(directoryIteratorTest.cpp TEST_NAME directoryIteratorTest LINK_LIBRARIES Qt::Test filelightInternal)
+ecm_add_test(localListerTest.cpp TEST_NAME localListerTest LINK_LIBRARIES Qt::Test filelightInternal)

autotests/localListerTest.cpp

+// SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+// SPDX-FileCopyrightText: 2022 Harald Sitter <sitter@kde.org>
+
+#include <QDebug>
+#include <QSignalSpy>
+#include <QTest>
+
+#include "fileTree.h"
+#include "localLister.h"
+#include "scan.h"
+#include "test-config.h"
+
+Q_DECLARE_METATYPE(std::shared_ptr<Folder>)
+
+class LocalListerTest : public QObject
+{
+    Q_OBJECT
+    const QString m_tree = QFINDTESTDATA("iterator-tree");
+private Q_SLOTS:
+    void testRun()
+    {
+        qRegisterMetaType<std::shared_ptr<File>>("std::shared_ptr<File>");
+        qRegisterMetaType<std::shared_ptr<Folder>>("std::shared_ptr<Folder>");
+
+        auto cache = new QList<std::shared_ptr<Folder>>;
+        Filelight::ScanManager manager(nullptr);
+        Filelight::LocalLister lister(m_tree, cache, &manager);
+        QSignalSpy spy(&lister, &Filelight::LocalLister::branchCompleted);
+        lister.start();
+        lister.wait();
+        spy.wait();
+        const auto arguments = spy.takeFirst();
+        const auto root = arguments.at(0).value<std::shared_ptr<Folder>>();
+
+        QVERIFY(root);
+        QCOMPARE(root->children(), 4);
+#ifdef Q_OS_LINUX
+        QCOMPARE(root->size(), 16384);
+#endif
+    }
+};
+
+QTEST_GUILESS_MAIN(LocalListerTest)
+
+#include "localListerTest.moc"

src/CMakeLists.txt

@@ -15,15 +15,26 @@ if (HAVE_SINCOS)
     add_definitions(-DHAVE_SINCOS)
 endif()
 
-add_library(filelightInternal STATIC fileTree.cpp directoryIterator.cpp fileCleaner.cpp)
+add_library(filelightInternal STATIC
+    fileTree.cpp
+    directoryIterator.cpp
+    fileCleaner.cpp
+    scan.cpp
+    Config.cpp
+    localLister.cpp
+    remoteLister.cpp
+)
+ecm_qt_declare_logging_category(filelightInternal HEADER filelight_debug.h IDENTIFIER FILELIGHT_LOG CATEGORY_NAME org.kde.filelight DESCRIPTION "filelight" EXPORT FILELIGHT)
 if (WIN32)
     target_sources(filelightInternal PRIVATE windowsWalker.cpp)
 else()
     target_sources(filelightInternal PRIVATE posixWalker.cpp)
 endif()
 target_link_libraries(filelightInternal
-    Qt${QT_MAJOR_VERSION}::Core
+    Qt${QT_MAJOR_VERSION}::Gui
     KF5::CoreAddons
+    KF5::ConfigCore
+    KF5::KIOWidgets # Only used for KDirLister, may be able to move away from that.
 )
 
 add_executable(filelight)
@@ -31,11 +42,7 @@ target_sources(filelight PRIVATE
     radialMap/item.cpp
     radialMap/map.cpp
     radialMap/radialMap.cpp
-    scan.cpp
-    Config.cpp
     settingsDialog.cpp
-    localLister.cpp
-    remoteLister.cpp
     historyAction.cpp
     mainContext.cpp
     main.cpp
@@ -52,7 +59,6 @@ target_sources(filelight PRIVATE
     Config.h
     qml/qml.qrc
 )
-ecm_qt_declare_logging_category(filelight HEADER filelight_debug.h IDENTIFIER FILELIGHT_LOG CATEGORY_NAME org.kde.filelight DESCRIPTION "filelight" EXPORT FILELIGHT)
 
 set(filelight_ICONS
     ${CMAKE_CURRENT_SOURCE_DIR}/../misc/16-apps-filelight.png
@@ -68,7 +74,6 @@ ki18n_wrap_ui(filelight dialog.ui)
 target_link_libraries(filelight
     KF5::I18n
     KF5::XmlGui
-    KF5::KIOWidgets # Only used for KDirLister, may be able to move away from that.
     Qt${QT_MAJOR_VERSION}::Svg
     Qt${QT_MAJOR_VERSION}::Quick
     Qt${QT_MAJOR_VERSION}::QuickControls2