Add wxTEST_DIALOG for testing of modal dialogs.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72837 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/motif/dialog.cpp

@@ -21,6 +21,7 @@
 #endif
 
 #include "wx/evtloop.h"
+#include "wx/testing.h"
 
 #ifdef __VMS__
 #pragma message disable nosimpint
@@ -288,6 +289,8 @@ bool wxDialog::Show( bool show )
 // Shows a dialog modally, returning a return code
 int wxDialog::ShowModal()
 {
+    WX_TESTING_SHOW_MODAL_HOOK();
+
     Show(true);
 
     // after the event loop ran, the widget might already have been destroyed