How to use the sentinelsat.SentinelAPI.to_geojson function in sentinelsat

def test_footprints_s2(products, fixture_path):
    footprints = SentinelAPI.to_geojson(products)
    for footprint in footprints["features"]:
        assert not footprint["geometry"].errors()

    with open(fixture_path("expected_search_footprints_s2.geojson")) as geojson_file:
        expected_footprints = geojson.loads(geojson_file.read())
    # to compare unordered lists (JSON objects) they need to be sorted or changed to sets
    assert set(footprints) == set(expected_footprints)

def test_footprints_s2(products, fixture_path):
    footprints = SentinelAPI.to_geojson(products)
    for footprint in footprints['features']:
        assert not footprint['geometry'].errors()

    with open(fixture_path('expected_search_footprints_s2.geojson')) as geojson_file:
        expected_footprints = geojson.loads(geojson_file.read())
    # to compare unordered lists (JSON objects) they need to be sorted or changed to sets
    assert set(footprints) == set(expected_footprints)