How to use the pyproj.CRS.from_epsg function in pyproj

def test_epsg():
    with pytest.warns(FutureWarning):
        assert CRS({"init": "EPSG:4326"}).to_epsg(20) == 4326
        assert CRS({"init": "EPSG:4326"}).to_epsg() is None
    assert CRS.from_user_input(4326).to_epsg() == 4326
    assert CRS.from_epsg(4326).to_epsg() == 4326
    assert CRS.from_user_input("epsg:4326").to_epsg() == 4326

def test_is_geocentric():
    ccs = CRS.from_epsg(4328)
    assert ccs.is_geocentric

def test_sub_crs():
    crs = CRS.from_epsg(5972)
    sub_crs_list = crs.sub_crs_list
    assert len(sub_crs_list) == 2
    assert sub_crs_list[0] == CRS.from_epsg(25832)
    assert sub_crs_list[1] == CRS.from_epsg(5941)
    assert crs.is_projected
    assert crs.is_vertical
    assert not crs.is_geographic

def test_area_of_use():
    crs1 = CRS.from_epsg(4326)
    assert crs1.area_of_use.bounds == (-180.0, -90.0, 180.0, 90.0)
    assert crs1.area_of_use.name == "World"

def test_to_dict_from_dict():
    cc = CRS.from_epsg(4326)
    with pytest.warns(UserWarning):
        assert CRS.from_dict(cc.to_dict()).name == "unknown"

def test_sub_crs__none():
    assert CRS.from_epsg(4326).sub_crs_list == []

def test_crs_hash_unequal():
    """hashes of non-equivalent CRS are not equal"""
    assert hash(CRS.from_epsg(3857)) != hash(CRS.from_epsg(4326))

def test_from_epsg():
    proj = CRS.from_epsg(4326)
    assert proj.to_epsg() == 4326

    # Test with invalid EPSG code
    with pytest.raises(CRSError):
        assert CRS.from_epsg(0)

def test_ellipsoid():
    crs1 = CRS.from_epsg(4326)
    assert "{:.3f}".format(crs1.ellipsoid.inverse_flattening) == "298.257"
    assert "{:.3f}".format(crs1.ellipsoid.semi_major_metre) == "6378137.000"
    assert "{:.3f}".format(crs1.ellipsoid.semi_minor_metre) == "6356752.314"

def test_coordinate_operation():
    crs = CRS.from_epsg(26915)
    assert repr(crs.coordinate_operation) == (
        "\n"
        "UTM zone 15N\n"
        "Area of Use:\n"
        "- name: World - N hemisphere - 96°W to 90°W\n"
        "- bounds: (-96.0, 0.0, -90.0, 84.0)"
    )
    assert crs.coordinate_operation.method_name == "Transverse Mercator"
    assert crs.coordinate_operation.name == str(crs.coordinate_operation)
    assert crs.coordinate_operation.method_auth_name == "EPSG"
    assert crs.coordinate_operation.method_code == "9807"
    assert crs.coordinate_operation.is_instantiable == 1
    assert crs.coordinate_operation.has_ballpark_transformation == 0
    assert crs.coordinate_operation.accuracy == -1.0
    assert repr(crs.coordinate_operation.params) == (
        "[Param(name=Latitude of natural origin, auth_name=EPSG, code=8801, "