Tighten atol to simulate insufficient precision

Author: pavoljuhas

cirq-core/cirq/linalg/transformations_test.py

@@ -391,19 +391,19 @@ def test_sub_state_vector() -> None:
 
     # Reject factoring for very tight tolerance.
     assert (
-        cirq.sub_state_vector(state, [0, 1], default=_DEFAULT_ARRAY, atol=1e-16) is _DEFAULT_ARRAY
+        cirq.sub_state_vector(state, [0, 1], default=_DEFAULT_ARRAY, atol=0) is _DEFAULT_ARRAY
     )
     assert (
-        cirq.sub_state_vector(state, [2, 3, 4], default=_DEFAULT_ARRAY, atol=1e-16)
+        cirq.sub_state_vector(state, [2, 3, 4], default=_DEFAULT_ARRAY, atol=0)
         is _DEFAULT_ARRAY
     )
     assert (
-        cirq.sub_state_vector(state, [5, 6, 7, 8], default=_DEFAULT_ARRAY, atol=1e-16)
+        cirq.sub_state_vector(state, [5, 6, 7, 8], default=_DEFAULT_ARRAY, atol=0)
         is _DEFAULT_ARRAY
     )
 
     # Ensure None can be passed as the `default` argument
-    assert cirq.sub_state_vector(state, [0, 1], default=None, atol=1e-16) is None
+    assert cirq.sub_state_vector(state, [0, 1], default=None, atol=0) is None
 
     # Permit invalid factoring for loose tolerance.
     for q1 in range(9):