test/MapSavingLoading.cpp

#include "RadiantTest.h"

#include <fstream>
#include "iundo.h"
#include "imap.h"
#include "imapformat.h"
#include "iradiant.h"
#include "iselectiongroup.h"
#include "ilightnode.h"
#include "icommandsystem.h"
#include "messages/FileSelectionRequest.h"
#include "algorithm/Scene.h"
#include "algorithm/XmlUtils.h"
#include "algorithm/Primitives.h"
#include "os/file.h"
#include <sigc++/connection.h>

namespace test
{

namespace
{

class FileSelectionHelper
{
private:
    std::size_t _msgSubscription;
    std::string _path;
    map::MapFormatPtr _format;

public:
    FileSelectionHelper(const std::string& path, const map::MapFormatPtr& format) :
        _path(path),
        _format(format)
    {
        // Subscribe to the event asking for the target path
        _msgSubscription = GlobalRadiantCore().getMessageBus().addListener(
            radiant::IMessage::Type::FileSelectionRequest,
            radiant::TypeListener<radiant::FileSelectionRequest>(
                [this](radiant::FileSelectionRequest& msg)
        {
            msg.setHandled(true);
            msg.setResult(radiant::FileSelectionRequest::Result
            {
                _path,
                _format->getMapFormatName()
            });
        }));
    }

    ~FileSelectionHelper()
    {
        GlobalRadiantCore().getMessageBus().removeListener(_msgSubscription);
    }
};

}

class MapFileTestBase : 
    public RadiantTest
{
private:
    std::list<fs::path> _pathsToCleanupAfterTest;

protected:
    virtual void TearDown() override
    {
        for (const auto& path : _pathsToCleanupAfterTest)
        {
            fs::remove(path);
        }

        RadiantTest::TearDown();
    }

    // Creates a copy of the given map (including the .darkradiant file) in the temp data path
    // The copy will be removed in the TearDown() method
    fs::path createMapCopyInTempDataPath(const std::string& modRelativeMapPath, const std::string& newFilename)
    {
        fs::path mapPath = _context.getTestResourcePath();
        mapPath /= modRelativeMapPath;

        fs::path targetPath = _context.getTemporaryDataPath();
        targetPath /= newFilename;

        fs::path targetInfoFilePath = fs::path(targetPath).replace_extension("darkradiant");

        _pathsToCleanupAfterTest.push_back(targetPath);
        _pathsToCleanupAfterTest.push_back(targetInfoFilePath);

        // Copy both .map and .darkradiant file
        fs::remove(targetPath);
        fs::remove(targetInfoFilePath);

        fs::copy(mapPath, targetPath);
        fs::copy(fs::path(mapPath).replace_extension("darkradiant"), targetInfoFilePath);

        return targetPath;
    }
};

using MapLoadingTest = MapFileTestBase;
using MapSavingTest = MapFileTestBase;

TEST_F(MapLoadingTest, openMapWithEmptyStringAsksForPath)
{
    bool eventFired = false;

    // Subscribe to the event we expect to be fired
    auto msgSubscription = GlobalRadiantCore().getMessageBus().addListener(
        radiant::IMessage::Type::FileSelectionRequest,
        radiant::TypeListener<radiant::FileSelectionRequest>(
            [&](radiant::FileSelectionRequest& msg)
    {
        eventFired = true;
    }));

    // Calling OpenMap with no arguments will send a message to the UI
    GlobalCommandSystem().executeCommand("OpenMap");

    EXPECT_TRUE(eventFired) << "OpenMap didn't ask for a map file as expected";

    GlobalRadiantCore().getMessageBus().removeListener(msgSubscription);
}

void checkAltarScene()
{
    auto root = GlobalMapModule().getRoot();
    auto worldspawn = GlobalMapModule().findOrInsertWorldspawn();
    
    // Check a specific spawnarg on worldspawn
    EXPECT_EQ(Node_getEntity(worldspawn)->getKeyValue("_color"), "0.286 0.408 0.259");

    // Check if all entities are present
    auto knownEntities = { "func_static_153", "func_static_154", "func_static_156",
        "func_static_155", "func_static_63", "func_static_66", "func_static_70",
        "func_static_164", "func_static_165", "light_torchflame_13", "religious_symbol_1" };
    
    for (auto entity : knownEntities)
    {
        EXPECT_TRUE(algorithm::getEntityByName(root, entity));
    }

    // Check number of patches
    auto isPatchDef3 = [](const scene::INodePtr& node) { return Node_isPatch(node) && Node_getIPatch(node)->subdivisionsFixed(); };
    auto isPatchDef2 = [](const scene::INodePtr& node) { return Node_isPatch(node) && !Node_getIPatch(node)->subdivisionsFixed(); };

    EXPECT_EQ(algorithm::getChildCount(worldspawn, isPatchDef3), 110); // 110 patchDef3
    EXPECT_EQ(algorithm::getChildCount(worldspawn, isPatchDef2), 16); // 16 patchDef2

    // Check number of brushes
    auto isBrush = [](const scene::INodePtr& node) { return Node_isBrush(node); };
    
    EXPECT_EQ(algorithm::getChildCount(root, isBrush), 37); // 37 brushes in total
    EXPECT_EQ(algorithm::getChildCount(worldspawn, isBrush), 21); // 21 worldspawn brushes
    EXPECT_EQ(algorithm::getChildCount(algorithm::getEntityByName(root, "func_static_66"), isBrush), 4); // 4 child brushes
    EXPECT_EQ(algorithm::getChildCount(algorithm::getEntityByName(root, "func_static_70"), isBrush), 4); // 4 child brushes
    EXPECT_EQ(algorithm::getChildCount(algorithm::getEntityByName(root, "func_static_164"), isBrush), 4); // 4 child brushes
    EXPECT_EQ(algorithm::getChildCount(algorithm::getEntityByName(root, "func_static_165"), isBrush), 4); // 4 child brushes

    // Check the lights
    auto isLight = [](const scene::INodePtr& node) { return Node_getLightNode(node) != nullptr; };
    EXPECT_EQ(algorithm::getChildCount(root, isLight), 1); // 1 light

    // Check a specific model
    auto religiousSymbol = Node_getEntity(algorithm::getEntityByName(root, "religious_symbol_1"));
    EXPECT_EQ(religiousSymbol->getKeyValue("classname"), "altar_moveable_loot_religious_symbol");
    EXPECT_EQ(religiousSymbol->getKeyValue("origin"), "-0.0448253 12.0322 -177");

    // Check layers
    EXPECT_TRUE(root->getLayerManager().getLayerID("Default") != -1);
    EXPECT_TRUE(root->getLayerManager().getLayerID("Windows") != -1);
    EXPECT_TRUE(root->getLayerManager().getLayerID("Lights") != -1);
    EXPECT_TRUE(root->getLayerManager().getLayerID("Ceiling") != -1);

    // Check map property
    EXPECT_EQ(root->getProperty("LastShaderClipboardMaterial"), "textures/tiles01");

    // Check selection group profile
    std::size_t numGroups = 0;
    std::multiset<std::size_t> groupCounts;
    root->getSelectionGroupManager().foreachSelectionGroup([&](const selection::ISelectionGroup& group)
    {
        ++numGroups;
        groupCounts.insert(group.size());
    });

    EXPECT_EQ(numGroups, 4);
    EXPECT_EQ(groupCounts.count(2), 1); // 1 group with 2 members
    EXPECT_EQ(groupCounts.count(3), 2); // 2 groups with 3 members
    EXPECT_EQ(groupCounts.count(12), 1); // 1 group with 12 members
}

TEST_F(MapLoadingTest, openMapFromAbsolutePath)
{
    // Generate an absolute path to a map in a temporary folder
    auto temporaryMap = createMapCopyInTempDataPath("maps/altar.map", "temp_altar.map");
    
    GlobalCommandSystem().executeCommand("OpenMap", temporaryMap.string());

    // Check if the scene contains what we expect
    checkAltarScene();
}

TEST_F(MapLoadingTest, openMapFromModRelativePath)
{
    std::string modRelativePath = "maps/altar.map";

    // The map is located in maps/altar.map folder, check that it physically exists
    fs::path mapPath = _context.getTestResourcePath();
    mapPath /= modRelativePath;
    EXPECT_TRUE(os::fileOrDirExists(mapPath));
    
    GlobalCommandSystem().executeCommand("OpenMap", modRelativePath);

    // Check if the scene contains what we expect
    checkAltarScene();
}

TEST_F(MapLoadingTest, openMapFromMapsFolder)
{
    std::string mapName = "altar.map";

    // The map is located in maps/altar.map folder, check that it physically exists
    fs::path mapPath = _context.getTestResourcePath();
    mapPath /= "maps";
    mapPath /= mapName;
    EXPECT_TRUE(os::fileOrDirExists(mapPath));

    GlobalCommandSystem().executeCommand("OpenMap", mapName);

    // Check if the scene contains what we expect
    checkAltarScene();
}

TEST_F(MapLoadingTest, openMapFromModPak)
{
    std::string modRelativePath = "maps/altar_in_pk4.map";

    // The map is located in maps/ folder within the altar.pk4, check that it doesn't physically exist
    fs::path mapPath = _context.getTestResourcePath();
    mapPath /= modRelativePath;
    EXPECT_FALSE(os::fileOrDirExists(mapPath));

    GlobalCommandSystem().executeCommand("OpenMap", modRelativePath);

    // Check if the scene contains what we expect
    checkAltarScene();
}

TEST_F(MapLoadingTest, openNonExistentMap)
{
    std::string mapName = "idontexist.map";
    GlobalCommandSystem().executeCommand("OpenMap", mapName);

    // No worldspawn in this map, it should be empty
    EXPECT_FALSE(algorithm::getEntityByName(GlobalMapModule().getRoot(), "world"));
}

TEST_F(MapSavingTest, saveMapWithoutModification)
{
    auto tempPath = createMapCopyInTempDataPath("maps/altar.map", "altar_saveMapWithoutModification.map");
    
    GlobalCommandSystem().executeCommand("OpenMap", tempPath.string());
    checkAltarScene();

    bool mapSavedFired = false;
    sigc::connection conn = GlobalMapModule().signal_mapEvent().connect([&](IMap::MapEvent ev)
    {
        mapSavedFired |= ev == IMap::MapEvent::MapSaved;
    });

    EXPECT_FALSE(GlobalMapModule().isModified());

    GlobalCommandSystem().executeCommand("SaveMap");

    // SaveMap should trigger even though the map is not modified
    EXPECT_TRUE(mapSavedFired);

    conn.disconnect();
}

TEST_F(MapSavingTest, saveMapClearsModifiedFlag)
{
    auto tempPath = createMapCopyInTempDataPath("maps/altar.map", "altar_modified_flag_test.map");

    GlobalCommandSystem().executeCommand("OpenMap", tempPath.string());
    checkAltarScene();

    EXPECT_FALSE(GlobalMapModule().isModified());

    // Modify the worldspawn key values (in an Undoable transaction)
    algorithm::setWorldspawnKeyValue("dummykey", "dummyvalue");

    // This should mark the map as modified
    EXPECT_TRUE(GlobalMapModule().isModified());

    GlobalCommandSystem().executeCommand("SaveMap");

    // Modified flag should be cleared now
    EXPECT_FALSE(GlobalMapModule().isModified());
}

TEST_F(MapSavingTest, saveMapDoesntChangeMap)
{
    // Create a copy of the map file in the mod-relative maps/ folder
    fs::path mapPath = _context.getTestResourcePath();
    mapPath /= "maps/altar.map";

    // The map is located in maps/altar.map folder, check that it physically exists
    std::string modRelativePath = "maps/altar_saveMapDoesntChangeMap.map";
    fs::path copiedMap = _context.getTestResourcePath();
    copiedMap /= modRelativePath;

    fs::remove(copiedMap);
    fs::remove(fs::path(copiedMap).replace_extension("darkradiant"));

    fs::remove(copiedMap);
    fs::copy(mapPath, copiedMap);
    fs::copy(fs::path(mapPath).replace_extension("darkradiant"), fs::path(copiedMap).replace_extension("darkradiant"));

    auto originalModificationDate = fs::last_write_time(copiedMap);

    GlobalCommandSystem().executeCommand("OpenMap", modRelativePath);
    checkAltarScene();

    GlobalCommandSystem().executeCommand("SaveMap");

    // Check that the file got modified
    EXPECT_NE(fs::last_write_time(copiedMap), originalModificationDate);

    // Load it again and check the scene
    GlobalCommandSystem().executeCommand("OpenMap", modRelativePath);
    checkAltarScene();

    fs::remove(copiedMap);
    fs::remove(fs::path(copiedMap).replace_extension("bak"));
    fs::remove(fs::path(copiedMap).replace_extension("darkradiant"));
    fs::remove(fs::path(copiedMap).replace_extension("darkradiant").string() + ".bak");
}

TEST_F(MapSavingTest, saveMapCreatesInfoFile)
{
    // Ensure a worldspawn entity, this is enough
    auto worldspawn = GlobalMapModule().findOrInsertWorldspawn();

    // Respond to the file selection request when saving
    fs::path tempPath = _context.getTemporaryDataPath();
    tempPath /= "just_a_worldspawn.map";
    auto infoFilePath = fs::path(tempPath).replace_extension("darkradiant");
    
    auto format = GlobalMapFormatManager().getMapFormatForFilename(tempPath.string());

    FileSelectionHelper responder(tempPath.string(), format);

    EXPECT_FALSE(os::fileOrDirExists(tempPath));
    EXPECT_FALSE(os::fileOrDirExists(infoFilePath));

    // Save the map
    GlobalCommandSystem().executeCommand("SaveMap");

    EXPECT_TRUE(os::fileOrDirExists(tempPath));
    EXPECT_TRUE(os::fileOrDirExists(infoFilePath));
}

namespace
{

// Shared algorithm to create a 6-brush map with layers
void doCheckSaveMapPreservesLayerInfo(const std::string& savePath, const map::MapFormatPtr& format)
{
    auto worldspawn = GlobalMapModule().findOrInsertWorldspawn();

    auto brush1 = algorithm::createCubicBrush(worldspawn, Vector3(400, 400, 400), "shader1");
    auto brush2 = algorithm::createCubicBrush(worldspawn, Vector3(500, 100, 200), "shader2");
    auto brush3 = algorithm::createCubicBrush(worldspawn, Vector3(300, 100, 200), "shader3");
    auto brush4 = algorithm::createCubicBrush(worldspawn, Vector3(300, 100, 700), "shader4");
    auto brush5 = algorithm::createCubicBrush(worldspawn, Vector3(300, 600, 700), "shader5");
    auto brush6 = algorithm::createCubicBrush(worldspawn, Vector3(300, 900, 700), "shader6");

    int layerId1 = GlobalMapModule().getRoot()->getLayerManager().createLayer("Layer1");
    int layerId2 = GlobalMapModule().getRoot()->getLayerManager().createLayer("Layer2");
    int layerId3 = GlobalMapModule().getRoot()->getLayerManager().createLayer("Layer3");
    int layerId4 = GlobalMapModule().getRoot()->getLayerManager().createLayer("Layer4");

    // Assign worldspawn to layers
    worldspawn->assignToLayers(scene::LayerList{ 0, layerId1, layerId2, layerId3, layerId4 });

    // Assign brushes to layers
    brush1->assignToLayers(scene::LayerList{ 0, layerId1 });
    brush2->assignToLayers(scene::LayerList{ layerId1, layerId2 });
    brush3->assignToLayers(scene::LayerList{ layerId3, layerId2 });
    brush4->assignToLayers(scene::LayerList{ 0, layerId4 });
    brush5->assignToLayers(scene::LayerList{ 0, layerId4 });
    brush6->assignToLayers(scene::LayerList{ layerId2, layerId4 });

    // Clear any referenes to the old scene
    worldspawn = brush1 = brush2 = brush3 = brush4 = brush5 = brush6 = scene::INodePtr();

    // Respond to the file selection request when saving
    FileSelectionHelper responder(savePath, format);

    // Save the map
    GlobalCommandSystem().executeCommand("SaveMap");

    // Clear the map, load from that file
    GlobalCommandSystem().executeCommand("OpenMap", savePath);

    // Refresh the node references from the new map
    worldspawn = GlobalMapModule().findOrInsertWorldspawn();
    brush1 = algorithm::findFirstBrushWithMaterial(worldspawn, "shader1");
    brush2 = algorithm::findFirstBrushWithMaterial(worldspawn, "shader2");
    brush3 = algorithm::findFirstBrushWithMaterial(worldspawn, "shader3");
    brush4 = algorithm::findFirstBrushWithMaterial(worldspawn, "shader4");
    brush5 = algorithm::findFirstBrushWithMaterial(worldspawn, "shader5");
    brush6 = algorithm::findFirstBrushWithMaterial(worldspawn, "shader6");

    // Check the layers
    EXPECT_EQ(worldspawn->getLayers(), scene::LayerList({ 0, layerId1, layerId2, layerId3, layerId4 }));
    EXPECT_EQ(brush1->getLayers(), scene::LayerList({ 0, layerId1 }));
    EXPECT_EQ(brush2->getLayers(), scene::LayerList({ layerId1, layerId2 }));
    EXPECT_EQ(brush3->getLayers(), scene::LayerList({ layerId3, layerId2 }));
    EXPECT_EQ(brush4->getLayers(), scene::LayerList({ 0, layerId4 }));
    EXPECT_EQ(brush5->getLayers(), scene::LayerList({ 0, layerId4 }));
    EXPECT_EQ(brush6->getLayers(), scene::LayerList({ layerId2, layerId4 }));
}

}

TEST_F(MapSavingTest, saveMapPreservesLayerInfo)
{
    fs::path tempPath = _context.getTemporaryDataPath();
    tempPath /= "six_brushes_with_layers.map";
    auto format = GlobalMapFormatManager().getMapFormatForFilename(tempPath.string());

    doCheckSaveMapPreservesLayerInfo(tempPath.string(), format);
}

TEST_F(MapSavingTest, saveMapxPreservesLayerInfo)
{
    fs::path tempPath = _context.getTemporaryDataPath();
    tempPath /= "six_brushes_with_layers.mapx";
    auto format = GlobalMapFormatManager().getMapFormatForFilename(tempPath.string());

    doCheckSaveMapPreservesLayerInfo(tempPath.string(), format);
}

TEST_F(MapSavingTest, saveAs)
{
    std::string modRelativePath = "maps/altar.map";

    // The map is located in maps/altar.map folder, check that it physically exists
    fs::path mapPath = _context.getTestResourcePath();
    mapPath /= modRelativePath;
    auto originalModificationDate = fs::last_write_time(mapPath);

    GlobalCommandSystem().executeCommand("OpenMap", modRelativePath);
    checkAltarScene();

    // Select the format based on the extension
    auto format = GlobalMapFormatManager().getMapFormatForFilename(modRelativePath);
    fs::path tempPath = _context.getTemporaryDataPath();
    tempPath /= "altar_copy.map";

    EXPECT_FALSE(os::fileOrDirExists(tempPath));
    
    // Respond to the event asking for the target path
    FileSelectionHelper responder(tempPath.string(), format);

    GlobalCommandSystem().executeCommand("SaveMapAs");

    // Check that the file got created
    EXPECT_TRUE(os::fileOrDirExists(tempPath));

    // The map path should have been changed
    EXPECT_EQ(GlobalMapModule().getMapName(), tempPath.string());

    // Load it again and check the scene
    GlobalCommandSystem().executeCommand("OpenMap", tempPath.string());
    checkAltarScene();
}

TEST_F(MapSavingTest, saveAsWithFormatWillContinueUsingThatFormat)
{
    std::string modRelativePath = "maps/altar.map";

    GlobalCommandSystem().executeCommand("OpenMap", modRelativePath);
    checkAltarScene();

    // Select the format based on the mapx extension
    fs::path tempPath = _context.getTemporaryDataPath();
    tempPath /= "altar_copy.mapx";

    auto format = GlobalMapFormatManager().getMapFormatForFilename(tempPath.string());
    EXPECT_EQ(format->getMapFormatName(), map::PORTABLE_MAP_FORMAT_NAME);

    FileSelectionHelper responder(tempPath.string(), format);

    EXPECT_FALSE(os::fileOrDirExists(tempPath));

    GlobalCommandSystem().executeCommand("SaveMapAs");

    // Check that the file got created
    EXPECT_TRUE(os::fileOrDirExists(tempPath));
    algorithm::assertFileIsMapxFile(tempPath.string());

    // The map path should have been changed
    EXPECT_EQ(GlobalMapModule().getMapName(), tempPath.string());

    // Modify something in the map and save again
    algorithm::setWorldspawnKeyValue("dummykey222", "dummyvalue");

    GlobalCommandSystem().executeCommand("SaveMap");

    // Check that file, it should still be using the portable format
    algorithm::assertFileIsMapxFile(tempPath.string());
}

TEST_F(MapSavingTest, saveCopyAs)
{
    std::string modRelativePath = "maps/altar.map";

    GlobalCommandSystem().executeCommand("OpenMap", modRelativePath);
    checkAltarScene();

    EXPECT_EQ(GlobalMapModule().getMapName(), modRelativePath);

    // Select the format based on the extension
    auto format = GlobalMapFormatManager().getMapFormatForFilename(modRelativePath);
    fs::path tempPath = _context.getTemporaryDataPath();
    tempPath /= "altar_copy.map";

    FileSelectionHelper responder(tempPath.string(), format);

    EXPECT_FALSE(os::fileOrDirExists(tempPath));

    GlobalCommandSystem().executeCommand("SaveMapCopyAs");

    // Check that the file got created
    EXPECT_TRUE(os::fileOrDirExists(tempPath));

    // The map path should NOT have been changed
    EXPECT_EQ(GlobalMapModule().getMapName(), modRelativePath);

    // Load the copy and verify the scene
    GlobalCommandSystem().executeCommand("OpenMap", tempPath.string());
    checkAltarScene();
}

TEST_F(MapSavingTest, saveCopyAsMapx)
{
    std::string modRelativePath = "maps/altar.map";

    GlobalCommandSystem().executeCommand("OpenMap", modRelativePath);
    checkAltarScene();

    EXPECT_EQ(GlobalMapModule().getMapName(), modRelativePath);

    // Select the format based on the mapx extension
    fs::path tempPath = _context.getTemporaryDataPath();
    tempPath /= "altar_copy.mapx";

    auto format = GlobalMapFormatManager().getMapFormatForFilename(tempPath.string());
    EXPECT_EQ(format->getMapFormatName(), map::PORTABLE_MAP_FORMAT_NAME);

    FileSelectionHelper responder(tempPath.string(), format);

    EXPECT_FALSE(os::fileOrDirExists(tempPath));

    GlobalCommandSystem().executeCommand("SaveMapCopyAs");

    // Check that the file got created
    EXPECT_TRUE(os::fileOrDirExists(tempPath));

    // Check the output file
    algorithm::assertFileIsMapxFile(tempPath.string());

    // The map path should NOT have been changed
    EXPECT_EQ(GlobalMapModule().getMapName(), modRelativePath);

    // Load the portable format map and verify the scene
    GlobalCommandSystem().executeCommand("OpenMap", tempPath.string());
    checkAltarScene();

    EXPECT_EQ(GlobalMapModule().getMapName(), tempPath);
}

// Check that the overwriting an existing map file will create a backup set
TEST_F(MapSavingTest, saveMapCreatesBackup)
{
    auto mapPath = createMapCopyInTempDataPath("maps/altar.map", "altar_saveMapCreatesBackup.map");

    auto originalSize = fs::file_size(mapPath);
    auto originalModDate = fs::last_write_time(mapPath);

    GlobalCommandSystem().executeCommand("OpenMap", mapPath.string());
    checkAltarScene();

    fs::path mapBackupPath = mapPath.replace_extension("bak");
    fs::path infoFileBackupPath = mapPath.replace_extension("darkradiant").string() + ".bak";

    EXPECT_FALSE(os::fileOrDirExists(mapBackupPath));
    EXPECT_FALSE(os::fileOrDirExists(infoFileBackupPath));

    GlobalCommandSystem().executeCommand("SaveMap");

    // Check that the target file got modified
    EXPECT_NE(fs::last_write_time(mapPath), originalModDate);

    // Check that the backup files exist now
    EXPECT_TRUE(os::fileOrDirExists(mapBackupPath));
    EXPECT_TRUE(os::fileOrDirExists(infoFileBackupPath));

    // The backup should have the write time of the original map
    EXPECT_EQ(fs::last_write_time(mapBackupPath), originalModDate);

    // Remove the backup at the end of this test
    fs::remove(mapBackupPath);
    fs::remove(infoFileBackupPath);
}

TEST_F(MapSavingTest, saveMapxCreatesBackup)
{
    // TODO
}

TEST_F(MapSavingTest, saveMapReplacesOldBackup)
{
    auto mapPath = createMapCopyInTempDataPath("maps/altar.map", "altar_saveMapReplacesOldBackup.map");

    // Create two fake backup files
    fs::path mapBackupPath = fs::path(mapPath).replace_extension("bak");

    std::ofstream fakeBackup(mapBackupPath.string());
    fakeBackup << "123=map";
    fakeBackup.flush();
    fakeBackup.close();

    auto originalBackupSize = fs::file_size(mapBackupPath);
    auto originalBackupModTime = fs::last_write_time(mapBackupPath);

    fs::path infoFileBackupPath = fs::path(mapPath).replace_extension("darkradiant").string() + ".bak";

    std::ofstream fakeInfoBackup(infoFileBackupPath.string());
    fakeInfoBackup << "123=info";
    fakeInfoBackup.flush();
    fakeInfoBackup.close();

    auto originalInfoBackupSize = fs::file_size(infoFileBackupPath);
    auto originalInfoBackupModTime = fs::last_write_time(infoFileBackupPath);

    // Open the map, verify the scene
    GlobalCommandSystem().executeCommand("OpenMap", mapPath.string());
    checkAltarScene();

    // Overwrite the map, this should replace the backups
    GlobalCommandSystem().executeCommand("SaveMap");

    // Check that the backup files got modified
    EXPECT_NE(fs::last_write_time(mapBackupPath), originalBackupModTime);
    EXPECT_NE(fs::last_write_time(infoFileBackupPath), originalInfoBackupModTime);

    EXPECT_NE(fs::file_size(mapBackupPath), originalBackupSize);
    EXPECT_NE(fs::file_size(infoFileBackupPath), originalInfoBackupSize);
}

}