.F.E..........F.

======================================================================

ERROR: testExpand (tester.ProblemTests)

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Traceback (most recent call last):

  File ".../test.py", line 62, in testExpand

    self.assertEqual(Interval(-3, 10), i.expand(right=-1))

TypeError: expand() got an unexpected keyword argument 'right'



======================================================================

FAIL: testContains (tester.ProblemTests)

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Traceback (most recent call last):

  File ".../test.py", line 85, in testContains

    self.assertFalse(Interval(None, -8).contains(Interval(-8, None)))

AssertionError



======================================================================

FAIL: testSum (tester.ProblemTests)

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Traceback (most recent call last):

  File ".../test.py", line 102, in testSum

    self.assertEqual(Interval(None, None), Interval(None, 11) + Interval(10, None))

AssertionError: Interval(None, None) != Interval(None, 11.0)



----------------------------------------------------------------------

Ran 16 tests in 0.005s



FAILED (failures=2, errors=1)