def test_formats_search_order():
# String is nice and easy to work with for this test
utf8_meta = {'format': {'name': 'utf-8'}}
unicode_meta = {
'format': {
'name': 'unicode'
}
} # just compat with older 'unicode'
json_meta = {'format': {'name': 'json'}}
# pd.DataFrame can be serialized to a few formats.
utf8_handler = FormatRegistry.search(obj_type=str, meta=utf8_meta)[0]
unicode_handler = FormatRegistry.search(obj_type=str, meta=unicode_meta)[0]
json_handler = FormatRegistry.search(obj_type=str, meta=json_meta)[0]
# FormatRegistry.search(), all other things being equal,
# should return the most-recently-registered format first.
utf8_handler.register()
assert FormatRegistry.search(obj_type=str)[0] is utf8_handler
unicode_handler.register()
assert FormatRegistry.search(obj_type=str)[0] is unicode_handler
json_handler.register()
assert FormatRegistry.search(obj_type=str)[0] is json_handler
utf8_handler.register()
assert FormatRegistry.search(obj_type=str)[0] is utf8_handler
# FormatRegistry.search() should not *exclude* by extension, because
# users could make files like "data.monday" or whatever.
# However, it should *prioritize* by extension.
#
# From the above section, utf8_handler is formats[0].
formats = FormatRegistry.search(obj_type=str, ext='.json')
assert utf8_handler in formats
assert unicode_handler in formats
assert formats[0] is json_handler
def test_formats_search_fail_notfound():
# a search that finds nothing should raise with an explanation.
class Foo:
pass
bad_kwargs = [
dict(obj_type=Foo, meta=None, ext=None),
dict(obj_type=None, meta={}, ext=None),
dict(obj_type=None, meta=None, ext='.fizz'),
]
for args in bad_kwargs:
with pytest.raises(QuiltException):
FormatRegistry.search(**args)