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Implement a pytest plugin to help with testing #135
Description
As part of some work in the core Flagsmith repository, we found that there isn't currently a good, generic solution for mocking the flagsmith client to return a given value for a flag at a given time. The ideal implementation as I see it would be to build a fixture that can be used as a context manager, or a function that looks something like this:
def my_test_function(set_flags: FlagsmithSetFlagsFixture) -> None:
with override_flagsmith(flags=[Flag(name="foo", enabled=True, value="foobar")]):
# in here, any calls to Flags.is_feature_enabled,Flags.get_flag and Flags.get_feature_value
# for the feature "foo" will return the values provided as an argument to override_flagsmith
...
def my_other_test_function(set_flags: FlagsmithSetFlagsFixture) -> None:
set_flags(flags=[Flag(name="foo", enabled=True, value="foobar")])
# For the remainder of this test, any calls to Flags.is_feature_enabled,Flags.get_flag
# and Flags.get_feature_value for the feature "foo" will return the values provided as
# an argument to override_flagsmithSee PR here for more context / discussions
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