Show errored testcase errors with failed testcase outputs

[tusharsadhwani]

Test 1 - ([1]).............................................................................FAILED
Test 2 - ([1, 2])..........................................................................PASSED
Test 3 - ([1, 2, 2, 1])....................................................................PASSED
Test 4 - ([1, 2, 3, 4, 5]).................................................................FAILED
Test 5 - ([1, 2, 3, 2, 1]).................................................................PASSED
Errors:

Inputs: [1]
Assertion: assert output == expected, (output, expected)
Expected: True
Error: AttributeError: 'NoneType' object has no attribute 'next'

Inputs: [1, 2, 3, 4, 5]
Assertion: assert output == expected, (output, expected)
Expected: True
Output: False

[tusharsadhwani]

Optionally, a -v flag to show the entire traceback