code: def test_equality(oblique_variants):
      """Check == and != operators of ccrs.ObliqueMercator."""
      default, alt_1, alt_2 = oblique_variants
      assert alt_1 == alt_2
      assert alt_1 != default
      assert hash(alt_1) != hash(default)
      assert hash(alt_1) == hash(alt_2)
  
file_path: cartopy/lib/cartopy/tests/crs/test_oblique_mercator.py
imports: from copy import deepcopy
  from typing import Dict, List, NamedTuple, Tuple
  import numpy
  import pytest
  import cartopy.crs
  from .helpers import check_proj_params
label_desc: Use image node_id 5 for calling a global function with example usage: test_equality(oblique_variants) without return types