diff --git a/logic/minecraft/ModList.cpp b/logic/minecraft/ModList.cpp
index 07affb720..43499612a 100644
--- a/logic/minecraft/ModList.cpp
+++ b/logic/minecraft/ModList.cpp
@@ -575,8 +575,8 @@ bool ModList::dropMimeData(const QMimeData *data, Qt::DropAction action, int row
 			if (!url.isLocalFile())
 				continue;
 			QString filename = url.toLocalFile();
-			installMod(filename, row);
 			qDebug() << "installing: " << filename;
+			installMod(filename, row);
 			// if there is no ordering, re-sort the list
 			if (m_list_file.isEmpty())
 			{
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index a09eb66a9..15b542e8a 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -19,11 +19,11 @@ endmacro()
 
 # Tests START #
 
-add_unit_test(pathutils tst_pathutils.cpp)
 add_unit_test(gradlespecifier tst_gradlespecifier.cpp)
 add_unit_test(userutils tst_userutils.cpp)
 add_unit_test(modutils tst_modutils.cpp)
 add_unit_test(inifile tst_inifile.cpp)
+add_unit_test(FileSystem tst_FileSystem.cpp)
 add_unit_test(UpdateChecker tst_UpdateChecker.cpp)
 add_unit_test(DownloadTask tst_DownloadTask.cpp)
 add_unit_test(filematchers tst_filematchers.cpp)
@@ -108,4 +108,7 @@ foreach(data_file ${data_files})
 	)
 endforeach()
 
+file(GLOB raw_data_files "data_raw/*")
+file(COPY ${raw_data_files} DESTINATION ${CMAKE_CURRENT_BINARY_DIR}/data/)
+
 configure_file(test_config.h.in test_config.h @ONLY)
diff --git a/tests/data_raw/test_folder/assets/minecraft/textures/blah.txt b/tests/data_raw/test_folder/assets/minecraft/textures/blah.txt
new file mode 100644
index 000000000..8d1c8b69c
--- /dev/null
+++ b/tests/data_raw/test_folder/assets/minecraft/textures/blah.txt
@@ -0,0 +1 @@
+ 
diff --git a/tests/data_raw/test_folder/pack.mcmeta b/tests/data_raw/test_folder/pack.mcmeta
new file mode 100644
index 000000000..67ee04348
--- /dev/null
+++ b/tests/data_raw/test_folder/pack.mcmeta
@@ -0,0 +1,6 @@
+{
+  "pack": {
+    "pack_format": 1,
+    "description": "Some resource pack maybe"
+  }
+}
diff --git a/tests/data_raw/test_folder/pack.nfo b/tests/data_raw/test_folder/pack.nfo
new file mode 100644
index 000000000..8d1c8b69c
--- /dev/null
+++ b/tests/data_raw/test_folder/pack.nfo
@@ -0,0 +1 @@
+ 
diff --git a/tests/tst_pathutils.cpp b/tests/tst_FileSystem.cpp
similarity index 55%
rename from tests/tst_pathutils.cpp
rename to tests/tst_FileSystem.cpp
index de5234b81..a9406d13c 100644
--- a/tests/tst_pathutils.cpp
+++ b/tests/tst_FileSystem.cpp
@@ -1,19 +1,27 @@
 #include <QTest>
 #include "TestUtil.h"
-#include <FileSystem.h>
 
-class PathUtilsTest : public QObject
+#include "FileSystem.h"
+
+class FileSystemTest : public QObject
 {
 	Q_OBJECT
+
+	const QString bothSlash = "/foo/";
+	const QString trailingSlash = "foo/";
+	const QString leadingSlash = "/foo";
+
 private
 slots:
-	void initTestCase()
-	{
-
-	}
-	void cleanupTestCase()
+	void test_pathCombine()
 	{
+		QCOMPARE(QString("/foo/foo"), FS::PathCombine(bothSlash, bothSlash));
+		QCOMPARE(QString("foo/foo"), FS::PathCombine(trailingSlash, trailingSlash));
+		QCOMPARE(QString("/foo/foo"), FS::PathCombine(leadingSlash, leadingSlash));
 
+		QCOMPARE(QString("/foo/foo/foo"), FS::PathCombine(bothSlash, bothSlash, bothSlash));
+		QCOMPARE(QString("foo/foo/foo"), FS::PathCombine(trailingSlash, trailingSlash, trailingSlash));
+		QCOMPARE(QString("/foo/foo/foo"), FS::PathCombine(leadingSlash, leadingSlash, leadingSlash));
 	}
 
 	void test_PathCombine1_data()
@@ -30,6 +38,7 @@ slots:
 		QTest::newRow("win native 2") << "C:/abc/def/ghi/jkl" << "C:\\abc\\def\\" << "ghi\\jkl";
 #endif
 	}
+
 	void test_PathCombine1()
 	{
 		QFETCH(QString, result);
@@ -57,6 +66,7 @@ slots:
 		QTest::newRow("win 4") << "C:/abc/def/ghi/jkl" << "C:\\abc\\" << "def" << "ghi\\jkl";
 #endif
 	}
+
 	void test_PathCombine2()
 	{
 		QFETCH(QString, result);
@@ -66,8 +76,41 @@ slots:
 
 		QCOMPARE(FS::PathCombine(path1, path2, path3), result);
 	}
+
+	void test_copy()
+	{
+		QString folder = QFINDTESTDATA("tests/data/test_folder");
+		auto f = [&folder]()
+		{
+			QTemporaryDir tempDir;
+			tempDir.setAutoRemove(true);
+			qDebug() << "From:" << folder << "To:" << tempDir.path();
+
+			QDir target_dir(FS::PathCombine(tempDir.path(), "test_folder"));
+			qDebug() << tempDir.path();
+			qDebug() << target_dir.path();
+			FS::copy c(folder, target_dir.path());
+			c();
+
+			for(auto entry: target_dir.entryList())
+			{
+				qDebug() << entry;
+			}
+			QVERIFY(target_dir.entryList().contains("pack.mcmeta"));
+			QVERIFY(target_dir.entryList().contains("assets"));
+		};
+
+		// first try variant without trailing /
+		QVERIFY(!folder.endsWith('/'));
+		f();
+
+		// then variant with trailing /
+		folder.append('/');
+		QVERIFY(folder.endsWith('/'));
+		f();
+	}
 };
 
-QTEST_GUILESS_MAIN(PathUtilsTest)
+QTEST_GUILESS_MAIN(FileSystemTest)
 
-#include "tst_pathutils.moc"
+#include "tst_FileSystem.moc"