With the unit tests warnings were squashed by suppressing them with SuppressWarnings annotations, instead of
reparing the issues as was done with the source. Reasons being...
 * The tests might be relying on the types as they were defined.
 * If the tests were written to test against the correct forms they would've/should've stipulated those.
 * Even unused members might be important to tests so we attempt to change as little as possible.

Changed to org.junit.Assert.

Changed to org.junit.Assert.

Changed to org.junit.Assert.

There were minimal changes:
Some tests had their own runners these were discontinued as IDEs/maven run the tests anyway.
Removed the main methods for these.
2 tests were dependent on the running order so added the test sorter.

All tests succeed on junit 4 with legacy support.

Move the test output folder 'runtests' to target or build directory so that mvn clean can clean that.

Due to the specification change of jigsaw, ClassLoader#defineClass()
cannot be invoked through reflection API.  As a workaround,
  --add-opens java.base/java.lang=ALL-UNNAMED
must be given to the JVM.  The ant target "runtest9" adds this jvm
argument.

LoaderClassPath is modified to show the same behavior in both Java 8 and 9.

Javassist cannot compile super.m() if m is a default method
declared in an interface.