def test_span_minus_non_overlapping_gives_span(self):
'''
-------------------+++++++++++++++++++
++++++++++++++++++--------------------
-------------------+++++++++++++++++++
'''
self.assertEqual(span_utils.difference([20, 40], [0, 19]), [[20, 40]])
'''
+++++++++++++++++++-------------------
--------------------++++++++++++++++++
-------------------+++++++++++++++++++
'''
self.assertEqual(span_utils.difference([0, 20], [21, 40]), [[0, 20]])
def test_right_overlapping_spans_have_one_different_chunk(self):
'''
----------++++++++++++++++++++--------
------------------++++++++++++++++++++
----------++++++++--------------------
'''
self.assertEqual(span_utils.difference([10, 30], [20, 40]), [[10, 20]])
def test_span_minus_centered_smaller_span_gives_two_different_chunks(self):
'''
++++++++++++++++++++++++++++++++++++++
---------+++++++++++++++++++----------
+++++++++-------------------++++++++++
'''
self.assertEqual(span_utils.difference([0, 40], [20, 30]),
[[0, 20], [30, 40]])
def __sub__(self, other):
if type(other) is timedelta:
return span_utils.shift(self, -other)
else:
return span_utils.difference(self, other)
def test_two_identical_spans_have_no_difference(self):
self.assertEqual(span_utils.difference([1, 2], [1, 2]), [])
def test_invalid_span_raises(self, span1, span2):
with self.assertRaises(TypeError):
span_utils.difference(span1, span2)