def METHOD_NAME(self):
    proxy = model.get_proxy(
        {
            "id": "banana",
            "schema": "Document",
            "properties": {
                "publishedAt": ["2016-01-01", "2018-02-03"],
                "modifiedAt": ["2016-01-01"],
            },
        }
    )
    proxy = simplify_provenance(proxy)
    assert 1 == len(proxy.get("modifiedAt")), proxy.get("modifiedAt")
    assert 1 == len(proxy.get("publishedAt")), proxy.get("publishedAt")
    assert "2016-01-01" in proxy.get("publishedAt")