Test cases for Line2D class

[David Gilbert]

First contribution from me...

I've attached some test cases for the Line2D class - all checks pass for
me on JDK 1.4.2_03 and JDK 1.3.1_11 (on SuSE Linux), 10 checks fail
using Classpath (fairly recent copy from CVS).  The failures I think
were pointed out earlier by Sven de Marothy on this list).  Sven's test
case is included in the attachments since I've added a couple of checks
to it - also his version is not yet in CVS.  

Also attached is a patch that I think fixes the linesIntersect() method
(can't be 100% sure since I'm having trouble building Classpath right at
the moment, but I'll confirm it as soon as I can - the code passed my
standalone tests OK).

Regards,

Dave Gilbert

P.S.  I have completed the FSF paperwork for contributing to Classpath,
is this a requirement for Mauve also?
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