def test_delete():
test_obj = LRUCache(1)
test_obj.write("some_key", 42)
test_obj.write(42, "some_key")
test_obj.delete("some_key")
test_obj.delete("non_existant_key")
test_obj.delete(42)
assert_raises( KeyError, test_obj.get_value, (42) )
assert_raises( KeyError, test_obj.get_value, ("some_key") )
assert not test_obj.exists(42)
assert not test_obj.exists("some_key")
def test_exists():
test_obj = LRUCache(1)
assert not test_obj.exists("some_key")
test_obj.write("some_key", 42)
assert test_obj.exists("some_key")
assert not test_obj.exists("some_other_key")
