600 lines
		
	
	
		
			21 KiB
		
	
	
	
		
			ReStructuredText
		
	
	
	
			
		
		
	
	
			600 lines
		
	
	
		
			21 KiB
		
	
	
	
		
			ReStructuredText
		
	
	
	
| 
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| .. _`tbreportdemo`:
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| 
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| Demo of Python failure reports with pytest
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| ==================================================
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| 
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| Here is a nice run of several tens of failures
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| and how ``pytest`` presents things (unfortunately
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| not showing the nice colors here in the HTML that you
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| get on the terminal - we are working on that)::
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| 
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|     assertion $ pytest failure_demo.py
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|     ======= test session starts ========
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|     platform linux -- Python 3.5.2, pytest-3.0.6, py-1.4.33, pluggy-0.4.0
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|     rootdir: $REGENDOC_TMPDIR/assertion, inifile: 
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|     collected 42 items
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|     
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|     failure_demo.py FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
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|     
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|     ======= FAILURES ========
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|     _______ test_generative[0] ________
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|     
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|     param1 = 3, param2 = 6
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|     
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|         def test_generative(param1, param2):
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|     >       assert param1 * 2 < param2
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|     E       assert (3 * 2) < 6
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|     
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|     failure_demo.py:16: AssertionError
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|     _______ TestFailing.test_simple ________
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|     
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|     self = <failure_demo.TestFailing object at 0xdeadbeef>
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|     
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|         def test_simple(self):
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|             def f():
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|                 return 42
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|             def g():
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|                 return 43
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|         
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|     >       assert f() == g()
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|     E       assert 42 == 43
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|     E        +  where 42 = <function TestFailing.test_simple.<locals>.f at 0xdeadbeef>()
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|     E        +  and   43 = <function TestFailing.test_simple.<locals>.g at 0xdeadbeef>()
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|     
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|     failure_demo.py:29: AssertionError
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|     _______ TestFailing.test_simple_multiline ________
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|     
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|     self = <failure_demo.TestFailing object at 0xdeadbeef>
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|     
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|         def test_simple_multiline(self):
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|             otherfunc_multi(
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|                       42,
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|     >                 6*9)
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|     
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|     failure_demo.py:34: 
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|     _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
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|     
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|     a = 42, b = 54
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|     
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|         def otherfunc_multi(a,b):
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|     >       assert (a ==
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|                     b)
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|     E       assert 42 == 54
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|     
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|     failure_demo.py:12: AssertionError
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|     _______ TestFailing.test_not ________
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|     
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|     self = <failure_demo.TestFailing object at 0xdeadbeef>
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|     
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|         def test_not(self):
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|             def f():
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|                 return 42
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|     >       assert not f()
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|     E       assert not 42
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|     E        +  where 42 = <function TestFailing.test_not.<locals>.f at 0xdeadbeef>()
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|     
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|     failure_demo.py:39: AssertionError
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|     _______ TestSpecialisedExplanations.test_eq_text ________
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|     
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|     self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>
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|     
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|         def test_eq_text(self):
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|     >       assert 'spam' == 'eggs'
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|     E       assert 'spam' == 'eggs'
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|     E         - spam
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|     E         + eggs
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|     
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|     failure_demo.py:43: AssertionError
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|     _______ TestSpecialisedExplanations.test_eq_similar_text ________
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|     
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|     self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>
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|     
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|         def test_eq_similar_text(self):
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|     >       assert 'foo 1 bar' == 'foo 2 bar'
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|     E       assert 'foo 1 bar' == 'foo 2 bar'
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|     E         - foo 1 bar
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|     E         ?     ^
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|     E         + foo 2 bar
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|     E         ?     ^
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|     
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|     failure_demo.py:46: AssertionError
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|     _______ TestSpecialisedExplanations.test_eq_multiline_text ________
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|     
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|     self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>
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|     
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|         def test_eq_multiline_text(self):
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|     >       assert 'foo\nspam\nbar' == 'foo\neggs\nbar'
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|     E       assert 'foo\nspam\nbar' == 'foo\neggs\nbar'
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|     E           foo
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|     E         - spam
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|     E         + eggs
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|     E           bar
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|     
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|     failure_demo.py:49: AssertionError
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|     _______ TestSpecialisedExplanations.test_eq_long_text ________
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|     
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|     self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>
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|     
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|         def test_eq_long_text(self):
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|             a = '1'*100 + 'a' + '2'*100
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|             b = '1'*100 + 'b' + '2'*100
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|     >       assert a == b
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|     E       assert '111111111111...2222222222222' == '1111111111111...2222222222222'
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|     E         Skipping 90 identical leading characters in diff, use -v to show
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|     E         Skipping 91 identical trailing characters in diff, use -v to show
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|     E         - 1111111111a222222222
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|     E         ?           ^
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|     E         + 1111111111b222222222
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|     E         ?           ^
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|     
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|     failure_demo.py:54: AssertionError
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|     _______ TestSpecialisedExplanations.test_eq_long_text_multiline ________
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|     
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|     self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>
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|     
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|         def test_eq_long_text_multiline(self):
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|             a = '1\n'*100 + 'a' + '2\n'*100
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|             b = '1\n'*100 + 'b' + '2\n'*100
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|     >       assert a == b
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|     E       assert '1\n1\n1\n1\n...n2\n2\n2\n2\n' == '1\n1\n1\n1\n1...n2\n2\n2\n2\n'
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|     E         Skipping 190 identical leading characters in diff, use -v to show
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|     E         Skipping 191 identical trailing characters in diff, use -v to show
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|     E           1
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|     E           1
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|     E           1
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|     E           1
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|     E           1
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|     E         - a2
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|     E         + b2
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|     E           2
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|     E           2
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|     E           2
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|     E           2
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|     
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|     failure_demo.py:59: AssertionError
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|     _______ TestSpecialisedExplanations.test_eq_list ________
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|     
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|     self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>
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|     
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|         def test_eq_list(self):
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|     >       assert [0, 1, 2] == [0, 1, 3]
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|     E       assert [0, 1, 2] == [0, 1, 3]
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|     E         At index 2 diff: 2 != 3
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|     E         Use -v to get the full diff
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|     
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|     failure_demo.py:62: AssertionError
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|     _______ TestSpecialisedExplanations.test_eq_list_long ________
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|     
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|     self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>
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|     
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|         def test_eq_list_long(self):
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|             a = [0]*100 + [1] + [3]*100
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|             b = [0]*100 + [2] + [3]*100
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|     >       assert a == b
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|     E       assert [0, 0, 0, 0, 0, 0, ...] == [0, 0, 0, 0, 0, 0, ...]
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|     E         At index 100 diff: 1 != 2
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|     E         Use -v to get the full diff
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|     
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|     failure_demo.py:67: AssertionError
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|     _______ TestSpecialisedExplanations.test_eq_dict ________
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|     
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|     self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>
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|     
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|         def test_eq_dict(self):
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|     >       assert {'a': 0, 'b': 1, 'c': 0} == {'a': 0, 'b': 2, 'd': 0}
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|     E       assert {'a': 0, 'b': 1, 'c': 0} == {'a': 0, 'b': 2, 'd': 0}
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|     E         Omitting 1 identical items, use -v to show
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|     E         Differing items:
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|     E         {'b': 1} != {'b': 2}
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|     E         Left contains more items:
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|     E         {'c': 0}
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|     E         Right contains more items:
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|     E         {'d': 0}
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|     E         Use -v to get the full diff
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|     
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|     failure_demo.py:70: AssertionError
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|     _______ TestSpecialisedExplanations.test_eq_set ________
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|     
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|     self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>
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|     
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|         def test_eq_set(self):
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|     >       assert set([0, 10, 11, 12]) == set([0, 20, 21])
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|     E       assert {0, 10, 11, 12} == {0, 20, 21}
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|     E         Extra items in the left set:
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|     E         10
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|     E         11
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|     E         12
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|     E         Extra items in the right set:
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|     E         20
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|     E         21
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|     E         Use -v to get the full diff
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|     
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|     failure_demo.py:73: AssertionError
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|     _______ TestSpecialisedExplanations.test_eq_longer_list ________
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|     
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|     self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>
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|     
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|         def test_eq_longer_list(self):
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|     >       assert [1,2] == [1,2,3]
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|     E       assert [1, 2] == [1, 2, 3]
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|     E         Right contains more items, first extra item: 3
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|     E         Use -v to get the full diff
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|     
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|     failure_demo.py:76: AssertionError
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|     _______ TestSpecialisedExplanations.test_in_list ________
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|     
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|     self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>
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|     
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|         def test_in_list(self):
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|     >       assert 1 in [0, 2, 3, 4, 5]
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|     E       assert 1 in [0, 2, 3, 4, 5]
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|     
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|     failure_demo.py:79: AssertionError
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|     _______ TestSpecialisedExplanations.test_not_in_text_multiline ________
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|     
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|     self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>
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|     
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|         def test_not_in_text_multiline(self):
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|             text = 'some multiline\ntext\nwhich\nincludes foo\nand a\ntail'
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|     >       assert 'foo' not in text
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|     E       assert 'foo' not in 'some multiline\ntext\nw...ncludes foo\nand a\ntail'
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|     E         'foo' is contained here:
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|     E           some multiline
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|     E           text
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|     E           which
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|     E           includes foo
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|     E         ?          +++
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|     E           and a
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|     E           tail
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|     
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|     failure_demo.py:83: AssertionError
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|     _______ TestSpecialisedExplanations.test_not_in_text_single ________
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|     
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|     self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>
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|     
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|         def test_not_in_text_single(self):
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|             text = 'single foo line'
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|     >       assert 'foo' not in text
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|     E       assert 'foo' not in 'single foo line'
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|     E         'foo' is contained here:
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|     E           single foo line
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|     E         ?        +++
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|     
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|     failure_demo.py:87: AssertionError
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|     _______ TestSpecialisedExplanations.test_not_in_text_single_long ________
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|     
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|     self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>
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|     
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|         def test_not_in_text_single_long(self):
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|             text = 'head ' * 50 + 'foo ' + 'tail ' * 20
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|     >       assert 'foo' not in text
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|     E       assert 'foo' not in 'head head head head hea...ail tail tail tail tail '
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|     E         'foo' is contained here:
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|     E           head head foo tail tail tail tail tail tail tail tail tail tail tail tail tail tail tail tail tail tail tail tail 
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|     E         ?           +++
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|     
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|     failure_demo.py:91: AssertionError
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|     ______ TestSpecialisedExplanations.test_not_in_text_single_long_term _______
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|     
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|     self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>
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|     
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|         def test_not_in_text_single_long_term(self):
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|             text = 'head ' * 50 + 'f'*70 + 'tail ' * 20
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|     >       assert 'f'*70 not in text
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|     E       assert 'fffffffffff...ffffffffffff' not in 'head head he...l tail tail '
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|     E         'ffffffffffffffffff...fffffffffffffffffff' is contained here:
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|     E           head head fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffftail tail tail tail tail tail tail tail tail tail tail tail tail tail tail tail tail tail tail tail 
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|     E         ?           ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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|     
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|     failure_demo.py:95: AssertionError
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|     _______ test_attribute ________
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|     
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|         def test_attribute():
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|             class Foo(object):
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|                 b = 1
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|             i = Foo()
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|     >       assert i.b == 2
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|     E       assert 1 == 2
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|     E        +  where 1 = <failure_demo.test_attribute.<locals>.Foo object at 0xdeadbeef>.b
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|     
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|     failure_demo.py:102: AssertionError
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|     _______ test_attribute_instance ________
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|     
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|         def test_attribute_instance():
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|             class Foo(object):
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|                 b = 1
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|     >       assert Foo().b == 2
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|     E       assert 1 == 2
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|     E        +  where 1 = <failure_demo.test_attribute_instance.<locals>.Foo object at 0xdeadbeef>.b
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|     E        +    where <failure_demo.test_attribute_instance.<locals>.Foo object at 0xdeadbeef> = <class 'failure_demo.test_attribute_instance.<locals>.Foo'>()
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|     
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|     failure_demo.py:108: AssertionError
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|     _______ test_attribute_failure ________
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|     
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|         def test_attribute_failure():
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|             class Foo(object):
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|                 def _get_b(self):
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|                     raise Exception('Failed to get attrib')
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|                 b = property(_get_b)
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|             i = Foo()
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|     >       assert i.b == 2
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|     
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|     failure_demo.py:117: 
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|     _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
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|     
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|     self = <failure_demo.test_attribute_failure.<locals>.Foo object at 0xdeadbeef>
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|     
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|         def _get_b(self):
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|     >       raise Exception('Failed to get attrib')
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|     E       Exception: Failed to get attrib
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|     
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|     failure_demo.py:114: Exception
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|     _______ test_attribute_multiple ________
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|     
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|         def test_attribute_multiple():
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|             class Foo(object):
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|                 b = 1
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|             class Bar(object):
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|                 b = 2
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|     >       assert Foo().b == Bar().b
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|     E       assert 1 == 2
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|     E        +  where 1 = <failure_demo.test_attribute_multiple.<locals>.Foo object at 0xdeadbeef>.b
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|     E        +    where <failure_demo.test_attribute_multiple.<locals>.Foo object at 0xdeadbeef> = <class 'failure_demo.test_attribute_multiple.<locals>.Foo'>()
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|     E        +  and   2 = <failure_demo.test_attribute_multiple.<locals>.Bar object at 0xdeadbeef>.b
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|     E        +    where <failure_demo.test_attribute_multiple.<locals>.Bar object at 0xdeadbeef> = <class 'failure_demo.test_attribute_multiple.<locals>.Bar'>()
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|     
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|     failure_demo.py:125: AssertionError
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|     _______ TestRaises.test_raises ________
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|     
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|     self = <failure_demo.TestRaises object at 0xdeadbeef>
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|     
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|         def test_raises(self):
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|             s = 'qwe'
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|     >       raises(TypeError, "int(s)")
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|     
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|     failure_demo.py:134: 
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|     _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
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|     
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|     >   int(s)
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|     E   ValueError: invalid literal for int() with base 10: 'qwe'
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|     
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|     <0-codegen $PYTHON_PREFIX/lib/python3.5/site-packages/_pytest/python.py:1207>:1: ValueError
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|     _______ TestRaises.test_raises_doesnt ________
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|     
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|     self = <failure_demo.TestRaises object at 0xdeadbeef>
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|     
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|         def test_raises_doesnt(self):
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|     >       raises(IOError, "int('3')")
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|     E       Failed: DID NOT RAISE <class 'OSError'>
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|     
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|     failure_demo.py:137: Failed
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|     _______ TestRaises.test_raise ________
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|     
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|     self = <failure_demo.TestRaises object at 0xdeadbeef>
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|     
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|         def test_raise(self):
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|     >       raise ValueError("demo error")
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|     E       ValueError: demo error
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|     
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|     failure_demo.py:140: ValueError
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|     _______ TestRaises.test_tupleerror ________
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|     
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|     self = <failure_demo.TestRaises object at 0xdeadbeef>
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|     
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|         def test_tupleerror(self):
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|     >       a,b = [1]
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|     E       ValueError: not enough values to unpack (expected 2, got 1)
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|     
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|     failure_demo.py:143: ValueError
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|     ______ TestRaises.test_reinterpret_fails_with_print_for_the_fun_of_it ______
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|     
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|     self = <failure_demo.TestRaises object at 0xdeadbeef>
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|     
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|         def test_reinterpret_fails_with_print_for_the_fun_of_it(self):
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|             l = [1,2,3]
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|             print ("l is %r" % l)
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|     >       a,b = l.pop()
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|     E       TypeError: 'int' object is not iterable
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|     
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|     failure_demo.py:148: TypeError
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|     --------------------------- Captured stdout call ---------------------------
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|     l is [1, 2, 3]
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|     _______ TestRaises.test_some_error ________
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|     
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|     self = <failure_demo.TestRaises object at 0xdeadbeef>
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|     
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|         def test_some_error(self):
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|     >       if namenotexi:
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|     E       NameError: name 'namenotexi' is not defined
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|     
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|     failure_demo.py:151: NameError
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|     _______ test_dynamic_compile_shows_nicely ________
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|     
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|         def test_dynamic_compile_shows_nicely():
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|             src = 'def foo():\n assert 1 == 0\n'
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|             name = 'abc-123'
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|             module = py.std.imp.new_module(name)
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|             code = _pytest._code.compile(src, name, 'exec')
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|             py.builtin.exec_(code, module.__dict__)
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|             py.std.sys.modules[name] = module
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|     >       module.foo()
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|     
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|     failure_demo.py:166: 
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|     _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
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|     
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|         def foo():
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|     >    assert 1 == 0
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|     E    AssertionError
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|     
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|     <2-codegen 'abc-123' $REGENDOC_TMPDIR/assertion/failure_demo.py:163>:2: AssertionError
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|     _______ TestMoreErrors.test_complex_error ________
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|     
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|     self = <failure_demo.TestMoreErrors object at 0xdeadbeef>
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|     
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|         def test_complex_error(self):
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|             def f():
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|                 return 44
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|             def g():
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|                 return 43
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|     >       somefunc(f(), g())
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|     
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|     failure_demo.py:176: 
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|     _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
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|     failure_demo.py:9: in somefunc
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|         otherfunc(x,y)
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|     _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
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|     
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|     a = 44, b = 43
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|     
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|         def otherfunc(a,b):
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|     >       assert a==b
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|     E       assert 44 == 43
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|     
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|     failure_demo.py:6: AssertionError
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|     _______ TestMoreErrors.test_z1_unpack_error ________
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|     
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|     self = <failure_demo.TestMoreErrors object at 0xdeadbeef>
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|     
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|         def test_z1_unpack_error(self):
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|             l = []
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|     >       a,b  = l
 | |
|     E       ValueError: not enough values to unpack (expected 2, got 0)
 | |
|     
 | |
|     failure_demo.py:180: ValueError
 | |
|     _______ TestMoreErrors.test_z2_type_error ________
 | |
|     
 | |
|     self = <failure_demo.TestMoreErrors object at 0xdeadbeef>
 | |
|     
 | |
|         def test_z2_type_error(self):
 | |
|             l = 3
 | |
|     >       a,b  = l
 | |
|     E       TypeError: 'int' object is not iterable
 | |
|     
 | |
|     failure_demo.py:184: TypeError
 | |
|     _______ TestMoreErrors.test_startswith ________
 | |
|     
 | |
|     self = <failure_demo.TestMoreErrors object at 0xdeadbeef>
 | |
|     
 | |
|         def test_startswith(self):
 | |
|             s = "123"
 | |
|             g = "456"
 | |
|     >       assert s.startswith(g)
 | |
|     E       assert False
 | |
|     E        +  where False = <built-in method startswith of str object at 0xdeadbeef>('456')
 | |
|     E        +    where <built-in method startswith of str object at 0xdeadbeef> = '123'.startswith
 | |
|     
 | |
|     failure_demo.py:189: AssertionError
 | |
|     _______ TestMoreErrors.test_startswith_nested ________
 | |
|     
 | |
|     self = <failure_demo.TestMoreErrors object at 0xdeadbeef>
 | |
|     
 | |
|         def test_startswith_nested(self):
 | |
|             def f():
 | |
|                 return "123"
 | |
|             def g():
 | |
|                 return "456"
 | |
|     >       assert f().startswith(g())
 | |
|     E       assert False
 | |
|     E        +  where False = <built-in method startswith of str object at 0xdeadbeef>('456')
 | |
|     E        +    where <built-in method startswith of str object at 0xdeadbeef> = '123'.startswith
 | |
|     E        +      where '123' = <function TestMoreErrors.test_startswith_nested.<locals>.f at 0xdeadbeef>()
 | |
|     E        +    and   '456' = <function TestMoreErrors.test_startswith_nested.<locals>.g at 0xdeadbeef>()
 | |
|     
 | |
|     failure_demo.py:196: AssertionError
 | |
|     _______ TestMoreErrors.test_global_func ________
 | |
|     
 | |
|     self = <failure_demo.TestMoreErrors object at 0xdeadbeef>
 | |
|     
 | |
|         def test_global_func(self):
 | |
|     >       assert isinstance(globf(42), float)
 | |
|     E       assert False
 | |
|     E        +  where False = isinstance(43, float)
 | |
|     E        +    where 43 = globf(42)
 | |
|     
 | |
|     failure_demo.py:199: AssertionError
 | |
|     _______ TestMoreErrors.test_instance ________
 | |
|     
 | |
|     self = <failure_demo.TestMoreErrors object at 0xdeadbeef>
 | |
|     
 | |
|         def test_instance(self):
 | |
|             self.x = 6*7
 | |
|     >       assert self.x != 42
 | |
|     E       assert 42 != 42
 | |
|     E        +  where 42 = <failure_demo.TestMoreErrors object at 0xdeadbeef>.x
 | |
|     
 | |
|     failure_demo.py:203: AssertionError
 | |
|     _______ TestMoreErrors.test_compare ________
 | |
|     
 | |
|     self = <failure_demo.TestMoreErrors object at 0xdeadbeef>
 | |
|     
 | |
|         def test_compare(self):
 | |
|     >       assert globf(10) < 5
 | |
|     E       assert 11 < 5
 | |
|     E        +  where 11 = globf(10)
 | |
|     
 | |
|     failure_demo.py:206: AssertionError
 | |
|     _______ TestMoreErrors.test_try_finally ________
 | |
|     
 | |
|     self = <failure_demo.TestMoreErrors object at 0xdeadbeef>
 | |
|     
 | |
|         def test_try_finally(self):
 | |
|             x = 1
 | |
|             try:
 | |
|     >           assert x == 0
 | |
|     E           assert 1 == 0
 | |
|     
 | |
|     failure_demo.py:211: AssertionError
 | |
|     _______ TestCustomAssertMsg.test_single_line ________
 | |
|     
 | |
|     self = <failure_demo.TestCustomAssertMsg object at 0xdeadbeef>
 | |
|     
 | |
|         def test_single_line(self):
 | |
|             class A:
 | |
|                 a = 1
 | |
|             b = 2
 | |
|     >       assert A.a == b, "A.a appears not to be b"
 | |
|     E       AssertionError: A.a appears not to be b
 | |
|     E       assert 1 == 2
 | |
|     E        +  where 1 = <class 'failure_demo.TestCustomAssertMsg.test_single_line.<locals>.A'>.a
 | |
|     
 | |
|     failure_demo.py:222: AssertionError
 | |
|     _______ TestCustomAssertMsg.test_multiline ________
 | |
|     
 | |
|     self = <failure_demo.TestCustomAssertMsg object at 0xdeadbeef>
 | |
|     
 | |
|         def test_multiline(self):
 | |
|             class A:
 | |
|                 a = 1
 | |
|             b = 2
 | |
|     >       assert A.a == b, "A.a appears not to be b\n" \
 | |
|                 "or does not appear to be b\none of those"
 | |
|     E       AssertionError: A.a appears not to be b
 | |
|     E         or does not appear to be b
 | |
|     E         one of those
 | |
|     E       assert 1 == 2
 | |
|     E        +  where 1 = <class 'failure_demo.TestCustomAssertMsg.test_multiline.<locals>.A'>.a
 | |
|     
 | |
|     failure_demo.py:228: AssertionError
 | |
|     _______ TestCustomAssertMsg.test_custom_repr ________
 | |
|     
 | |
|     self = <failure_demo.TestCustomAssertMsg object at 0xdeadbeef>
 | |
|     
 | |
|         def test_custom_repr(self):
 | |
|             class JSON:
 | |
|                 a = 1
 | |
|                 def __repr__(self):
 | |
|                     return "This is JSON\n{\n  'foo': 'bar'\n}"
 | |
|             a = JSON()
 | |
|             b = 2
 | |
|     >       assert a.a == b, a
 | |
|     E       AssertionError: This is JSON
 | |
|     E         {
 | |
|     E           'foo': 'bar'
 | |
|     E         }
 | |
|     E       assert 1 == 2
 | |
|     E        +  where 1 = This is JSON\n{\n  'foo': 'bar'\n}.a
 | |
|     
 | |
|     failure_demo.py:238: AssertionError
 | |
|     ======= 42 failed in 0.12 seconds ========
 |