Improve testing interactive experience.

Currently the exceptions that happen in the test are swallowed, as
the JVM is forced to exit before printing the stack trace.
Also assert message doesn't contain information about the problem.

The call to "sys.exit" masks bugs in the testing framework, that
has to be addressed more elaborately, so here we remove it. Also
add the message parameter to assert to make it more informative.

After removing "sys.exit" call, doc test starts failing. I suspect
there might be a problem when expanding doc variables, but this
should be addressed separately.

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