On 10Oct2015 17:41, Alex Kleider <aklei...@sonic.net> wrote:
I'm trying to follow a test driven development paradigm (using
unittest) but can't figure out how to test functions that collect
info from the command line such as the following.
Aside: I'd say "the standard input" , not "the command line"; to me the latter
connotes to command line arguments fro sys.argv.
Anyway, ...
I would supply test data either as a string in the unit tests or as a file kept
with the source tree eg:
os.path.join(os.path.dirname(__file__), 'test_data.txt')
and then parameterise the input source in you functions. For example:
def collect_data(src=None):
if src is None:
src = sys.stdin
and supply src.
However, you'r eusing input(), which unconditionally uses stdin and stdout. In
that circumstance I'd consider this:
def collect_data(src=None, out=None):
if src is None:
src = sys.stdin
if out is None:
out = sys.stdout
ostdin = sys.stdin
sys.stdin = src
ostdout = sys.stdout
sys.stdout = out
ret = {}
ret['first'] = input("Enter your first name: ")
... etc ...
sys.stdout = ostdout
sys.stdin = ostdin
Note that this is not thread safe because sys.stdin is a global, but it should
work for testing.
Anyway, perhap that gives you some way forward.
Cheers,
Cameron Simpson <c...@zip.com.au>
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