code: def test_same_longitudes(self):
      longitudes = [-81.123, -81.123]
      lower, upper = longitude_bounds(longitudes)
      assert upper > lower
      diff = abs(upper - lower)
      assert 1.99 * EPSILON < diff < 2.01 * EPSILON
      assert lower < -81.123 < upper
  
imports: import unittest
  import numpy
  from ..bounds import latitude_bounds, longitude_bounds, merge_longitude_bounds, MAX_ALLOWED_LATITUDE, MIN_ALLOWED_LATITUDE, EPSILON
label_desc: Use image node_id 6 for calling the LongitudeBounds obj's underlying member method code with example usage: obj.test_same_longitudes() without return types