diff --git a/upptst/Diff/Diff.upp b/upptst/Diff/Diff.upp
new file mode 100644
index 000000000..bb6f6dc93
--- /dev/null
+++ b/upptst/Diff/Diff.upp
@@ -0,0 +1,10 @@
+uses
+	CtrlLib,
+	TextDiffCtrl;
+
+file
+	main.cpp;
+
+mainconfig
+	"" = "GUI";
+
diff --git a/upptst/Diff/main.cpp b/upptst/Diff/main.cpp
new file mode 100644
index 000000000..90cd2794a
--- /dev/null
+++ b/upptst/Diff/main.cpp
@@ -0,0 +1,11 @@
+#include <CtrlLib/CtrlLib.h>
+#include <TextDiffCtrl/TextDiffCtrl.h>
+
+using namespace Upp;
+
+GUI_APP_MAIN
+{
+	PatchDiff d;
+	d.Open("C:/Users/cxl/patch.diff", Vector<String>() << "C:/xxx/classic/uppsrc/ide");
+	d.Run();
+}