def test_argument_retrieve():
setup_context()
meta = Metadata()
meta.foo = 'bar'
setup_context()
ctx.meta = meta
# test retrieval from ctx.env
ctx.env['FOO'] = 'bar'
arg = Argument('foo').retrieve(ctx.env)
assert arg.value == 'bar'
# test if argument is not present
del ctx.env['FOO']
arg = Argument('foo').retrieve(ctx.env)
arg.retrieve(ctx.env)
assert arg.value is None
assert arg.is_empty
# test retrieval from meta
arg = Argument('foo').retrieve(ctx.meta)
assert arg.value == 'bar'
col = OptionsCollection()
col.add(StringOption('foo', 'Enables foo for testing.', keys='somethingelse'))
col.retrieve_from_dict({'foo': 'bar'})
arg = Argument('foo').retrieve(col)
assert arg.value == 'bar'
arg = Argument('foo').retrieve({'foo': 'bar'})
assert arg.value == 'bar'
col = ArgumentCollection.from_dict({'foo': 'bar'})
arg = Argument('foo').retrieve(col)
assert arg.value == 'bar'
arg = Argument('foo').retrieve('bar')
assert arg.value == 'bar'
