Import vests testsuite

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diff --git a/testsuite/vests/vhdl-ams/ashenden/compliant/analog-modeling/pendulum.vhd b/testsuite/vests/vhdl-ams/ashenden/compliant/analog-modeling/pendulum.vhd
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+
+-- Copyright (C) 2002 Morgan Kaufmann Publishers, Inc
+
+-- This file is part of VESTs (Vhdl tESTs).
+
+-- VESTs 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. 
+
+-- VESTs 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 VESTs; if not, write to the Free Software Foundation,
+-- Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+
+library ieee;  use ieee.math_real.all;
+               
+entity pendulum is
+end entity pendulum;
+
+----------------------------------------------------------------
+
+architecture constrained of pendulum is
+  
+  constant mass : real := 10.0;
+  constant arm_length : real := 5.0;
+  constant pin_angle : real := 0.25 * math_pi;
+  constant pin_distance : real := 2.5;
+  constant damping : real := 1.0;
+  constant gravity : real := 9.81;
+  constant short_length : real := arm_length - pin_distance;
+  quantity phi : real := -0.5*math_pi;
+  quantity current_length : real := arm_length;
+        
+begin
+  
+  if phi'above(pin_angle) use
+    current_length == short_length;
+  else
+    current_length == arm_length;
+  end use;
+        
+  break phi'dot => phi'dot * arm_length/short_length
+    when phi'above(pin_angle);
+        
+  break phi'dot => phi'dot * short_length/arm_length
+    when not phi'above(pin_angle);
+        
+  mass * current_length * phi'dot'dot
+    == - mass * gravity * sin(phi) - damping * current_length * phi'dot;
+        
+end architecture constrained;