class_docstr: Tests for state vector projector observable.
class_docstr_tok: ["Tests","for","state","vector","projector","observable","."]
docstr: Test we obtain the correct label when "matrices" key pair is not a list.
docstr_tok: ["Test","we","obtain","the","correct","label","when","``","matrices","''","key","pair","is","not","a","list","."]
code: def test_label_matrices_not_list_in_cache(self, projector):
      """Test we obtain the correct label when "matrices" key pair is not a list."""
      assert projector.label(cache={"matrices": 0}) == "P"
  
imports: import functools
  import pickle
  import pytest
  import numpy
  from gate_data import I, X, Y, Z, H
  import pennylane
  from pennylane.ops.qubit.observables import BasisStateProjector, StateVectorProjector
label_desc: Use image node_id 5 for calling the TestStateVectorProjector obj's underlying member method code with example usage: obj.test_label_matrices_not_list_in_cache(projector) without return types