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diff --git a/test/unittest_viewport.cxx b/test/unittest_viewport.cxx
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+++ b/test/unittest_viewport.cxx
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+//
+// "$Id: $"
+//
+// Unit tests for the Fast Light Tool Kit (FLTK).
+//
+// Copyright 1998-2009 by Bill Spitzak and others.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU Library General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+// USA.
+//
+// Please report all bugs and problems on the following page:
+//
+//     http://www.fltk.org/str.php
+//
+
+#include <FL/Fl_Box.H>
+#include <FL/fl_draw.H>
+
+//
+//------- test viewport clipping ----------
+//
+class ViewportTest : public Fl_Box {
+public: 
+  static Fl_Widget *create() {
+    return new ViewportTest(TESTAREA_X, TESTAREA_Y, TESTAREA_W, TESTAREA_H);
+  }
+  ViewportTest(int x, int y, int w, int h) : Fl_Box(x, y, w, h) { 
+    label("Testing Viewport Alignment\n\n"
+          "Only green lines should be visible.\n"
+          "If red lines are visible in the corners of this window,\n"
+          "your viewport alignment and clipping is off.\n"
+          "If there is a space between the green lines and the window border,\n"
+          "the viewport is off, but some clipping may be working.\n"
+          "Also, your window size may be off to begin with.");
+    align(FL_ALIGN_INSIDE|FL_ALIGN_CENTER|FL_ALIGN_WRAP);
+    box(FL_BORDER_BOX);
+  }
+  void show() {
+    Fl_Box::show();
+    mainwin->testAlignment(1);
+  }
+  void hide() {
+    Fl_Box::hide();
+    mainwin->testAlignment(0);
+  }
+};
+
+UnitTest viewport("viewport test", ViewportTest::create);
+
+//
+// End of "$Id: 
+//