I think I have this figured out, but I want to be certain I am doing
it both correctly and in the preferred way. I have a need for a
get_input() function and have written my first test for this function
as follows:
class TestGetInput(unittest.TestCase):
'''Tests for the function get_input().'''
def setUp(self):
'''Establish conditions for running these tests.'''
# Redirect sys.stdin in order to test input functions.
self.old_stdin = sys.stdin
sys.stdin = StringIO('5')
def test_get_input(self):
'''Test that get_input() returns the expected result.'''
expected = 5
draw2x2grid.get_input()
self.assertEqual(sys.stdin.getvalue(), expected)
def tearDown(self):
'''Clear temporary testing variables.'''
# Return sys.stdin to its normal state.
sys.stdin = self.old_stdin
When I run my tests I get the promising:
c:\thinkpython2\ch3\ex_3-3>py -m unittest
F...
======================================================================
FAIL: test_get_input (test_draw2x2grid.TestGetInput)
Test that get_input() returns the expected result.
----------------------------------------------------------------------
Traceback (most recent call last):
File "c:\thinkpython2\ch3\ex_3-3\test_draw2x2grid.py", line 119, in
test_get_input
self.assertEqual(sys.stdin.getvalue(), expected)
AssertionError: '5' != 5
----------------------------------------------------------------------
Ran 4 tests in 0.000s
FAILED (failures=1)
Currently the get_input() function is:
def get_input():
'''Get string input from the user and convert it to an integer. This
integer is returned to the caller.
:num_sides: Number of sides for the displayed grid.'''
pass
I was bored with the actual exercise 3.3 in the text which is just to
print an ASCII 2x2 grid and then a 3x3 grid, so I am using the TDD
process to created a generalized grid printing program. So please
excuse the file names "test_draw2x2grid.py" and "draw2x2grid.py".
Let me know if there is a better way to test input() (The heart of
get_input()), or if I have outright misconceptions, etc.
TIA!
--
boB
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