test/test_BatchProcessor.rb consistently fails on Fedora-33

[AndersBlomdell]

With Fedora 33 i conistently get failures in test/test_BatchProcessor.rb:

$ rake test
/usr/src/TaskJuggler/lib/taskjuggler/MessageHandler.rb:251: warning: possibly useless use of a variable in void context
Loaded suite /usr/share/gems/gems/rake-13.0.1/lib/rake/rake_test_loader
Started
.................................................#<Thread:0x000055590aa943c8 /usr/src/TaskJuggler/test/test_BatchProcessor.rb:23 run> terminated with exception (report_on_exception is true):
/usr/share/gems/gems/test-unit-3.3.6/lib/test/unit/assertions.rb:59:in `block in assert_block': Test timed out. (Test::Unit::AssertionFailedError)
<false> is not true.
	from /usr/share/gems/gems/test-unit-3.3.6/lib/test/unit/assertions.rb:1635:in `_wrap_assertion'
	from /usr/share/gems/gems/test-unit-3.3.6/lib/test/unit/assertions.rb:53:in `assert_block'
	from /usr/share/gems/gems/test-unit-3.3.6/lib/test/unit/assertions.rb:167:in `block in assert'
	from /usr/share/gems/gems/test-unit-3.3.6/lib/test/unit/assertions.rb:1640:in `_wrap_assertion'
	from /usr/share/gems/gems/test-unit-3.3.6/lib/test/unit/assertions.rb:134:in `assert'
	from /usr/src/TaskJuggler/test/test_BatchProcessor.rb:27:in `block in setup'
F
===============================================================================
Failure: test_simple(TestProject):
  Test timed out.
  <false> is not true.
/usr/src/TaskJuggler/test/test_BatchProcessor.rb:27:in `block in setup'
===============================================================================
............................................................
Finished in 203.35506152 seconds.
-------------------------------------------------------------------------------
110 tests, 261596 assertions, 1 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications
99.0909% passed
-------------------------------------------------------------------------------
0.54 tests/s, 1286.40 assertions/s
rake aborted!
Command failed with status (1)
/usr/share/gems/gems/rake-13.0.1/exe/rake:27:in `<top (required)>'
Tasks: TOP => test => unittest
(See full trace by running task with --trace)