code: def testIsAll(self):
      g = Graph.Full(5)
      self.assertTrue(g.es.is_all())
      self.assertFalse(g.es.select(1, 2, 3).is_all())
      self.assertFalse(g.es.select(_within=[1, 2, 3]).is_all())
  
imports: import unittest
  from igraph import Graph, Edge, EdgeSeq, VertexSeq
  from .utils import is_pypy
label_desc: Use image node_id 28 for calling the EdgeSeqTests obj's underlying member method code with example usage: obj.testIsAll() without return types