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Deliver multiple versions of a test based on positional combinations.
This is a facade over pytest.mark.parametrize.
:param \*comb: argument combinations. These are tuples that will be passed
positionally to the decorated function.
:param argnames: optional list of argument names. These are the names
of the arguments in the test function that correspond to the entries
in each argument tuple. pytest.mark.parametrize requires this, however
the combinations function will derive it automatically if not present
by using ``inspect.getfullargspec(fn).args[1:]``. Note this assumes the
first argument is "self" which is discarded.
:param id\_: optional id template. This is a string template that
describes how the "id" for each parameter set should be defined, if any.
The number of characters in the template should match the number of
entries in each argument tuple. Each character describes how the
corresponding entry in the argument tuple should be handled, as far as
whether or not it is included in the arguments passed to the function, as
well as if it is included in the tokens used to create the id of the
parameter set.
If omitted, the argument combinations are passed to parametrize as is. If
passed, each argument combination is turned into a pytest.param() object,
mapping the elements of the argument tuple to produce an id based on a
character value in the same position within the string template using the
following scheme:
.. sourcecode:: text
i - the given argument is a string that is part of the id only, don't
pass it as an argument
n - the given argument should be passed and it should be added to the
id by calling the .__name__ attribute
r - the given argument should be passed and it should be added to the
id by calling repr()
s - the given argument should be passed and it should be added to the
id by calling str()
a - (argument) the given argument should be passed and it should not
be used to generated the id
e.g.::
@testing.combinations(
(operator.eq, "eq"),
(operator.ne, "ne"),
(operator.gt, "gt"),
(operator.lt, "lt"),
id_="na",
)
def test_operator(self, opfunc, name):
pass
The above combination will call ``.__name__`` on the first member of
each tuple and use that as the "id" to pytest.param().
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that can be used as a switch.
e.g.::
@testing.variation("querytyp", ["select", "subquery", "legacy_query"])
@testing.variation("lazy", ["select", "raise", "raise_on_sql"])
def test_thing(self, querytyp, lazy, decl_base):
class Thing(decl_base):
__tablename__ = "thing"
# use name directly
rel = relationship("Rel", lazy=lazy.name)
# use as a switch
if querytyp.select:
stmt = select(Thing)
elif querytyp.subquery:
stmt = select(Thing).subquery()
elif querytyp.legacy_query:
stmt = Session.query(Thing)
else:
querytyp.fail()
The variable provided is a slots object of boolean variables, as well
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