class_docstr: Test Evolution(Exp) class that takes a parameter x and a generator G and defines an evolution exp(ixG)
docstr: Test that the label is informative and uses decimals.
docstr_tok: ["Test","that","the","label","is","informative","and","uses","decimals","."]
code: def test_label(self, op, decimals, expected):
      """Test that the label is informative and uses decimals."""
      assert op.label(decimals=decimals) == expected
  
imports: import pytest
  import pennylane
  from pennylane import numpy
  from pennylane.ops.op_math import Evolution, Exp
label_desc: Use image node_id 11 for calling the TestEvolution obj's underlying member method code with example usage: obj.test_label(op, decimals, expected) without return types