def test_get_config_filename_not_set():
"""
If the envvar is not set, not filename is returned.
"""
metadata = Metadata("foo-bar")
config_filename = get_config_filename(metadata)
assert_that(config_filename, is_(none()))
def test_get_config_filename():
"""
If the envvar is set, it is used as the filename.
"""
metadata = Metadata("foo-bar")
with envvar("FOO_BAR_SETTINGS", "/tmp/foo-bar.conf"):
config_filename = get_config_filename(metadata)
assert_that(config_filename, is_(equal_to("/tmp/foo-bar.conf")))