...F.....EFF....

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

ERROR: testLeftRight (tester.ProblemTests)

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Traceback (most recent call last):

  File ".../test.py", line 57, in testLeftRight

    self.assertEqual(-5.0, i.left())

TypeError: 'int' object is not callable



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

FAIL: 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))

AssertionError: Interval(-3, 10) != None



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

FAIL: testLen (tester.ProblemTests)

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Traceback (most recent call last):

  File ".../test.py", line 99, in testLen

    self.assertEqual(7, len(Interval(-2, 4.1)))

AssertionError: 7 != 6



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

FAIL: testOpen (tester.ProblemTests)

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

Traceback (most recent call last):

  File ".../test.py", line 51, in testOpen

    self.assertTrue(i.open())

AssertionError



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

Ran 16 tests in 0.008s



FAILED (failures=3, errors=1)