Fix test assertion in raw_types_test.py.

[codrut3]

This fixes a small issue that I found while working on #7291

TaggedOperation _decompose_ calls protocols.decompose_once (see here). So it must be compared against cirq.decompose_once.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.68%. Comparing base (e27d883) to head (9217f4c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7401      +/-   ##
==========================================
- Coverage   98.68%   98.68%   -0.01%     
==========================================
  Files        1112     1112              
  Lines       97709    97709              
==========================================
- Hits        96427    96426       -1     
- Misses       1282     1283       +1     

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[pavoljuhas]

I wonder if we should be testing the _decompose_ method directly or rather its effect on the public cirq.decompose API.

How about changing it like this:

diff --git a/cirq-core/cirq/ops/raw_types_test.py b/cirq-core/cirq/ops/raw_types_test.py
index c4fda0413..b819ade48 100644
--- a/cirq-core/cirq/ops/raw_types_test.py
+++ b/cirq-core/cirq/ops/raw_types_test.py
@@ -652,6 +652,5 @@ def test_tagged_operation_forwards_protocols() -> None:
     np.testing.assert_equal(cirq.unitary(tagged_h), cirq.unitary(h))
     assert cirq.has_unitary(tagged_h)
-    assert cirq.decompose(tagged_h) == cirq.decompose(h)
-    assert [*tagged_h._decompose_()] == cirq.decompose(h)
+    assert cirq.decompose(tagged_h) == cirq.decompose_once(h)
     assert cirq.pauli_expansion(tagged_h) == cirq.pauli_expansion(h)
     assert cirq.equal_up_to_global_phase(h, tagged_h)

Otherwise LGTM.