code: def test_multiline(self):
      class A:
          a = 1
  
      b = 2
      assert (
          A.a == b
      ), "A.a appears not to be b\nor does not appear to be b\none of those"
  
imports: import pytest
  from pytest import raises
label_desc: Use image node_id 2 for calling the TestCustomAssertMsg obj's underlying member method code with example usage: obj.test_multiline() without return types