def METHOD_NAME(self):
    class Foo(CCIDictModel):
        bar: str = None
        fields_ = Field([], alias="fields")
    x = Foo.parse_obj({"bar": "q"})
    assert x.get("bar") == x.bar == x["bar"] == "q"
    assert x.get("xyzzy", 0) == 0
    assert x.get("xyzzy") is None
    assert x.get("fields") == []