diff --git a/pytket/phir/sharding/shard.py b/pytket/phir/sharding/shard.py
index 00af2ad..41b41ee 100644
--- a/pytket/phir/sharding/shard.py
+++ b/pytket/phir/sharding/shard.py
@@ -35,21 +35,6 @@ class Shard:
     # A set of the identifiers of other shards this particular shard depends upon
     depends_upon: set[int]
 
-    # def __post_init__(self) -> None:
-    #     self.qubits_used = set(self.primary_command.qubits)
-    #     self.bits_written = set(self.primary_command.bits)
-    #     self.bits_read = set()
-
-    #     all_sub_commands: list[Command] = []
-    #     for sub_commands in self.sub_commands.values():
-    #         all_sub_commands.extend(sub_commands)
-
-    #     for sub_command in all_sub_commands:
-    #         self.bits_written.update(sub_command.bits)
-    #         self.bits_read.update(
-    #             set(filter(lambda x: isinstance(x, Bit), sub_command.args)),  # type: ignore [misc,arg-type]  # noqa: E501
-    #         )
-
     def pretty_print(self) -> str:
         output = io.StringIO()
         output.write(f"Shard {self.ID}:")
diff --git a/tests/test_shard.py b/tests/test_shard.py
deleted file mode 100644
index e2f03e7..0000000
--- a/tests/test_shard.py
+++ /dev/null
@@ -1,44 +0,0 @@
-EMPTY_INT_SET: set[int] = set()
-
-
-class TestShard:
-    pass
-    # def test_shard_ctor(self) -> None:
-    #     circ = Circuit(4)  # qubits are numbered 0-3
-    #     circ.X(0)  # first apply an X gate to qubit 0
-    #     circ.CX(1, 3)  # and apply a CX gate with control qubit 1 and target qubit 3
-    #     circ.Z(3)  # then apply a Z gate to qubit 3
-    #     commands = circ.get_commands()
-
-    #     shard = Shard(
-    #         commands[1],
-    #         {commands[0].qubits[0]: [commands[0]]},
-    #         EMPTY_INT_SET,
-    #     )
-
-    #     assert shard.primary_command == commands[1]
-    #     assert shard.depends_upon == EMPTY_INT_SET
-    #     sub_command_key, sub_command_value = next(iter(shard.sub_commands.items()))
-    #     assert sub_command_key == commands[0].qubits[0]
-    #     assert sub_command_value[0] == commands[0]
-
-    # def test_shard_ctor_conditional(self) -> None:
-    #     circuit = Circuit(4, 4)
-    #     circuit.H(0)
-    #     circuit.Measure(0, 0)
-    #     circuit.X(1, condition_bits=[0], condition_value=1)  # type: ignore [misc]
-    #     circuit.Measure(1, 1)  # The command we'll build the shard from
-    #     commands = circuit.get_commands()
-
-    #     shard = Shard(
-    #         commands[3],
-    #         {
-    #             circuit.qubits[0]: [commands[2]],
-    #         },
-    #         EMPTY_INT_SET,
-    #     )
-
-    #     assert len(shard.sub_commands.items())
-    #     assert shard.qubits_used == {circuit.qubits[1]}
-    #     assert shard.bits_read == {circuit.bits[0]}
-    #     assert shard.bits_written == {circuit.bits[1]}
diff --git a/tests/test_sharder.py b/tests/test_sharder.py
index 34ad51d..aa1d962 100644
--- a/tests/test_sharder.py
+++ b/tests/test_sharder.py
@@ -13,7 +13,6 @@ def test_should_op_create_shard(self) -> None:
             Op.create(OpType.Reset),  # type: ignore  # noqa: PGH003
             Op.create(OpType.CX),  # type: ignore  # noqa: PGH003
             Op.create(OpType.Barrier),  # type: ignore  # noqa: PGH003
-            # Op.create(OpType.SetBits, [3, 1]),
         ]
         expected_false: list[Op] = [
             Op.create(OpType.U1, 0.32),  # type: ignore  # noqa: PGH003
@@ -113,7 +112,7 @@ def test_simple_conditional(self) -> None:
         assert len(shards[2].sub_commands.keys()) == 0
         assert shards[2].qubits_used == set()
         assert shards[2].bits_written == {circuit.bits[1]}
-        # assert shards[2].bits_read == {circuit.bits[0]}
+        assert shards[2].bits_read == {circuit.bits[0], circuit.bits[1]}
         assert shards[2].depends_upon == {shards[0].ID}
 
         # shard 3: [if (c==1) h q;] measure q->c;