ModbatTestHarness.scala.setTestJar does not set CLASSPATH correctly

[cyrille-artho]

For unit testing, we need to override environment variable CLASSPATH.

To achieve this, use the code described under
"For use in scenarios where you need to set specific environment values for unit tests"
at https://stackoverflow.com/questions/318239/how-do-i-set-environment-variables-from-java

Use that and change System.setProperty to setEnv.
You also have to create a new Map "newEnv" with one entry that you pass to setEnv.

Once this works, the extra argument "--classpath=build/modbat-test.jar" can be removed in all (about 10) tests in src/test/scala:

• src/test/scala/modbat/mbt/ChooseTest.scala
• src/test/scala/modbat/mbt/InvokeTransitionTest.scala
• src/test/scala/modbat/mbt/SetWeightTest.scala
• src/test/scala/modbat/mbt/TimeTest.scala