def test_construct_same_selectors():
int_selector_1 = Selector(fields={'an_int': Field(int)})
int_selector_2 = Selector(fields={'an_int': Field(int)})
# assert identical object
assert int_selector_1 is int_selector_2
# assert equivalent key
assert int_selector_1.inst().key == int_selector_2.inst().key
def test_construct_different_selectors():
int_selector = Selector(fields={'an_int': Field(int)})
string_selector = Selector(fields={'a_string': Field(str)})
assert int_selector is not string_selector
assert int_selector.inst().key != string_selector.inst().key
