Remove a few debug prints from tests (#5879)

These removals don't seem to affect the tests in any way. Don't merge until after #5878

cirq-core/cirq/contrib/routing/swap_network_test.py

@@ -80,5 +80,4 @@ def test_swap_network_str():
                                            │           │                                     │           │
 (4, 0): ───q(4)────────q(4)─────────q(4)───ZZ───q(4)───╱1╲───q(2)────────q(2)─────────q(2)───ZZ───q(2)───╱1╲───q(0)────────q(0)─────────q(0)───
     """.strip()
-    print(actual_str)
     assert actual_str == expected_str

cirq-core/cirq/devices/noise_utils_test.py

@@ -46,8 +46,6 @@ def test_op_identifier_subtypes():
 
 def test_op_id_str():
     op_id = OpIdentifier(cirq.XPowGate, cirq.LineQubit(0))
-    print(op_id)
-    print(repr(op_id))
     assert str(op_id) == "<class 'cirq.ops.common_gates.XPowGate'>(cirq.LineQubit(0),)"
     assert repr(op_id) == (
         "cirq.devices.noise_utils.OpIdentifier(cirq.ops.common_gates.XPowGate, cirq.LineQubit(0))"

cirq-core/cirq/experiments/xeb_simulation_test.py

@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import multiprocessing
-import time
 from typing import Dict, Any, Optional
 from typing import Sequence
 
@@ -135,16 +134,11 @@ def test_incremental_simulate(multiprocess):
     else:
         pool = None
 
-    start = time.perf_counter()
     df_ref = _ref_simulate_2q_xeb_circuits(circuits=circuits, cycle_depths=cycle_depths, pool=pool)
-    end1 = time.perf_counter()
 
     df = simulate_2q_xeb_circuits(circuits=circuits, cycle_depths=cycle_depths, pool=pool)
-    end2 = time.perf_counter()
     if pool is not None:
         pool.terminate()
-    print("\nnew:", end2 - end1, "old:", end1 - start)
-
     pd.testing.assert_frame_equal(df_ref, df)
 
     # Use below for approximate equality, if e.g. you're using qsim: