Error running mach:

    ['marionette', 'test', 'testing/marionette/harness/marionette_harness/tests/unit/']

The error occurred in code that was called by the mach command. This is either
a bug in the called code itself or in the way that mach is calling it.

You should consider filing a bug for this issue.

If filing a bug, please include the full output of mach, including this error
message.

The details of the failure are as follows:

  File "/home/hyperion/firefox/testing/marionette/harness/marionette_harness/tests/unit/test_browsermobproxy.py", line 3
    from __future__ import absolute_import
SyntaxError: from __future__ imports must occur at the beginning of the file

  File "/home/hyperion/firefox/testing/marionette/mach_commands.py", line 116, in marionette_test
    return run_marionette(tests, topsrcdir=self.topsrcdir, **kwargs)
  File "/home/hyperion/firefox/testing/marionette/mach_commands.py", line 60, in run_marionette
    failed = MarionetteHarness(MarionetteTestRunner, args=vars(args)).run()
  File "/home/hyperion/firefox/testing/marionette/harness/marionette_harness/runtests.py", line 74, in run
    runner.run_tests(tests)
  File "/home/hyperion/firefox/testing/marionette/harness/marionette_harness/runner/base.py", line 907, in run_tests
    self.run_test_sets()
  File "/home/hyperion/firefox/testing/marionette/harness/marionette_harness/runner/base.py", line 1110, in run_test_sets
    self.run_test_set(self.tests)
  File "/home/hyperion/firefox/testing/marionette/harness/marionette_harness/runner/base.py", line 1088, in run_test_set
    self.run_test(test['filepath'], test['expected'])
  File "/home/hyperion/firefox/testing/marionette/harness/marionette_harness/runner/base.py", line 1049, in run_test
    **self.test_kwargs)
  File "/home/hyperion/firefox/testing/marionette/harness/marionette_harness/marionette_test/testcases.py", line 315, in add_tests_to_suite
    test_mod = imp.load_source(mod_name, filepath)