How to manupulate Python unittest output '.' , E and F - python-3.x

Question

Python unittest give '.', E or F on ok, error or fail. We can avoid it by setting verbosity = 0, or /dev/null. but how can we change it. I mean I want to write after every test PASS, FAIL or ERROR instead of ., E or F, without using verbosity flag -V for output.
I am looking for following kind of output:
test one
PASS
test two
FAIL
test three
PASS
test four
ERROR
Thanks
Zubair

Answer 1

So using extra verbosity (-v) on the command line gets the desired output format:
Passing the -v option to your test script will instruct unittest.main()to enable a higher level of verbosity, and produce the following output:
test_isupper (__main__.TestStringMethods) ... ok
test_split (__main__.TestStringMethods) ... ok
test_upper (__main__.TestStringMethods) ... ok
----------------------------------------------------------------------
Ran 3 tests in 0.001s
OK
(https://docs.python.org/3/library/unittest.html#basic-example)
But we can also set the verbosity level from code:
You can run tests with more detailed information by passing in the verbosity argument:
if __name__ == '__main__':
unittest.main(verbosity=2)
(https://docs.python.org/3/library/unittest.html#unittest.main)

Answer 2

You can define your own test runner and result class to customize almost everything. If you just want to change the output of the test names (just the method name without the class) and change ok to PASS it's enough to override the startTest and addSuccess methods of the standard TextTestResult:
import unittest
class Test(unittest.TestCase):
def test_pass(self):
self.assertTrue(True)
def test_fail(self):
self.assertTrue(False)
def test_error(self):
x = 1 / 0
class MyTestResult(unittest.TextTestResult):
def __init__(self, stream, descriptions, verbosity):
super().__init__(stream, descriptions, verbosity)
self.stream = stream
self.verbosity = verbosity
def addSuccess(self, test):
if self.verbosity > 1:
self.stream.writeln("PASS")
else:
super().addSuccess(test)
def startTest(self, test):
unittest.TestResult.startTest(self, test)
if self.verbosity > 1:
self.stream.write(f"{test._testMethodName} ")
self.stream.flush()
if __name__ == "__main__":
unittest.main(testRunner=unittest.TextTestRunner(resultclass=MyTestResult, verbosity=2))
Output:
test_error ERROR
test_fail FAIL
test_pass PASS
======================================================================
ERROR: test_error (__main__.Test)
----------------------------------------------------------------------
Traceback (most recent call last):
File "test.py", line 12, in test_error
x = 1 / 0
ZeroDivisionError: division by zero
======================================================================
FAIL: test_fail (__main__.Test)
----------------------------------------------------------------------
Traceback (most recent call last):
File "test.py", line 9, in test_fail
self.assertTrue(False)
AssertionError: False is not true
----------------------------------------------------------------------
Ran 3 tests in 0.001s
FAILED (failures=1, errors=1)
instead of the standard output:
test_error (__main__.Test) ... ERROR
test_fail (__main__.Test) ... FAIL
test_pass (__main__.Test) ... ok
...