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diff --git a/test/vertical_position_test.cc b/test/vertical_position_test.cc
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+++ b/test/vertical_position_test.cc
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+/*
+    Copyright (C) 2015 Carl Hetherington <cth@carlh.net>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include "vertical_position.h"
+#include <boost/test/unit_test.hpp>
+
+using boost::optional;
+
+/* Test operator< for VerticalPosition */
+BOOST_AUTO_TEST_CASE (vertical_position_test)
+{
+	sub::VerticalPosition a;
+	sub::VerticalPosition b;
+	
+	/* Simple */
+	
+	a.proportional = 0.3;
+	a.reference = sub::TOP_OF_SCREEN;
+	b.proportional = 0.4;
+	b.reference = sub::TOP_OF_SCREEN;
+	BOOST_CHECK (a < b);
+
+	a.proportional = 0.5;
+	a.reference = sub::TOP_OF_SCREEN;
+	b.proportional = 0.1;
+	b.reference = sub::TOP_OF_SCREEN;
+	BOOST_CHECK (b < a);
+
+	a.proportional = optional<float> ();
+	b.proportional = optional<float> ();
+
+	a.line = 4;
+	a.lines = 25;
+	a.reference = sub::TOP_OF_SCREEN;
+	b.line = 6;
+	b.lines = 25;
+	b.reference = sub::TOP_OF_SCREEN;
+	BOOST_CHECK (a < b);
+
+	a.line = 17;
+	a.lines = 25;
+	a.reference = sub::TOP_OF_SCREEN;
+	b.line = 2;
+	b.lines = 25;
+	b.reference = sub::TOP_OF_SCREEN;
+	BOOST_CHECK (b < a);
+
+	/* Different reference points with proportional */
+
+	a.line = optional<int> ();
+	a.lines = optional<int> ();
+	b.line = optional<int> ();
+	b.lines = optional<int> ();
+
+	a.proportional = 0.7;
+	a.reference = sub::TOP_OF_SCREEN;
+	b.proportional = 0.3;
+	b.reference = sub::CENTRE_OF_SCREEN;
+	BOOST_CHECK (a < b);
+
+	a.proportional = 0.9;
+	a.reference = sub::BOTTOM_OF_SCREEN;
+	b.proportional = 0.1;
+	b.reference = sub::TOP_OF_SCREEN;
+	BOOST_CHECK (b < a);
+
+	/* Different line counts with lines */
+	
+	a.proportional = optional<float> ();
+	b.proportional = optional<float> ();
+
+	a.line = 12;
+	a.lines = 99;
+	a.reference = sub::TOP_OF_SCREEN;
+	b.line = 12;
+	b.lines = 25;
+	b.reference = sub::TOP_OF_SCREEN;
+	BOOST_CHECK (a < b);
+}