diff --git a/examples/quantum_chinese_chess/board_test.py b/examples/quantum_chinese_chess/board_test.py
index f6dad82f..317c719e 100644
--- a/examples/quantum_chinese_chess/board_test.py
+++ b/examples/quantum_chinese_chess/board_test.py
@@ -170,16 +170,16 @@ def test_flying_general_check_classical_cases():
     board = Board.from_fen()
     # If they are in different columns, the check fails.
     board.king_locations = ["d0", "e9"]
-    assert board.flying_general_check() == False
+    assert not board.flying_general_check()
 
     # If there are classical pieces between two KINGs, the check fails.
     board.king_locations = ["e0", "e9"]
-    assert board.flying_general_check() == False
+    assert not board.flying_general_check()
 
     # If there are no pieces between two KINGs, the check successes.
     board.board["e3"].reset()
     board.board["e6"].reset()
-    assert board.flying_general_check() == True
+    assert board.flying_general_check()
 
 
 def test_flying_general_check_quantum_cases():
diff --git a/examples/quantum_chinese_chess/chess_test.py b/examples/quantum_chinese_chess/chess_test.py
index c3423d57..c59b08c1 100644
--- a/examples/quantum_chinese_chess/chess_test.py
+++ b/examples/quantum_chinese_chess/chess_test.py
@@ -386,12 +386,12 @@ def test_update_board_by_sampling(monkeypatch):
     game.update_board_by_sampling()
     assert board["a0"].type_ == Type.EMPTY
     assert board["a0"].color == Color.NA
-    assert board["a0"].is_entangled == False
+    assert not board["a0"].is_entangled
 
     board["a1"].is_entangled = True
     # Verify that the method would set a1 to classically occupied.
     game.update_board_by_sampling()
-    assert board["a1"].is_entangled == False
+    assert not board["a1"].is_entangled
 
 
 def test_undo_single_effect_per_move(monkeypatch):
diff --git a/examples/quantum_chinese_chess/enums_test.py b/examples/quantum_chinese_chess/enums_test.py
index 827cb28b..03bea06d 100644
--- a/examples/quantum_chinese_chess/enums_test.py
+++ b/examples/quantum_chinese_chess/enums_test.py
@@ -21,7 +21,7 @@ def test_type_of():
     assert Type.type_of("k") == Type.KING
     assert Type.type_of("K") == Type.KING
     assert Type.type_of("·") == Type.EMPTY
-    assert Type.type_of("b") == None
+    assert Type.type_of("b") is None
 
 
 def test_symbol():
diff --git a/examples/quantum_chinese_chess/move_test.py b/examples/quantum_chinese_chess/move_test.py
index 8a798991..af5c882b 100644
--- a/examples/quantum_chinese_chess/move_test.py
+++ b/examples/quantum_chinese_chess/move_test.py
@@ -80,7 +80,7 @@ def test_move_type():
         move_type=MoveType.MERGE_JUMP,
         move_variant=MoveVariant.CAPTURE,
     )
-    assert move1.is_split_move() == False
+    assert not move1.is_split_move()
     assert move1.is_merge_move()
 
     move2 = Move(
@@ -91,7 +91,7 @@ def test_move_type():
         move_variant=MoveVariant.BASIC,
     )
     assert move2.is_split_move()
-    assert move2.is_merge_move() == False
+    assert not move2.is_merge_move()
 
     move3 = Move(
         world["a1"],
@@ -99,8 +99,8 @@ def test_move_type():
         move_type=MoveType.SLIDE,
         move_variant=MoveVariant.CAPTURE,
     )
-    assert move3.is_split_move() == False
-    assert move3.is_merge_move() == False
+    assert not move3.is_split_move()
+    assert not move3.is_merge_move()
 
 
 def test_to_str():
@@ -275,10 +275,10 @@ def test_split_jump_classical_source():
     assert_fifty_fifty(board_probabilities, locations_to_bitboard(["a3"]))
     assert world["a2"].type_ == Type.ROOK
     assert world["a2"].color == Color.RED
-    assert world["a2"].is_entangled == True
+    assert world["a2"].is_entangled
     assert world["a3"].type_ == Type.ROOK
     assert world["a3"].color == Color.RED
-    assert world["a3"].is_entangled == True
+    assert world["a3"].is_entangled
 
 
 def test_split_jump_quantum_source():
@@ -295,8 +295,8 @@ def test_split_jump_quantum_source():
             locations_to_bitboard(["a5"]): 0.25,
         },
     )
-    assert world["a4"].is_entangled == True
-    assert world["a5"].is_entangled == True
+    assert world["a4"].is_entangled
+    assert world["a5"].is_entangled
 
 
 def test_merge_jump_perfect_merge():
diff --git a/examples/quantum_chinese_chess/piece_test.py b/examples/quantum_chinese_chess/piece_test.py
index 90caf3dc..5be46ee5 100644
--- a/examples/quantum_chinese_chess/piece_test.py
+++ b/examples/quantum_chinese_chess/piece_test.py
@@ -58,7 +58,7 @@ def test_reset():
     p0.reset()
     assert p0.type_ == Type.EMPTY
     assert p0.color == Color.NA
-    assert p0.is_entangled == False
+    assert not p0.is_entangled
 
     p0.reset(p1)
     assert p0.type_ == p1.type_
diff --git a/unitary/alpha/quantum_world_test.py b/unitary/alpha/quantum_world_test.py
index fc40d128..bab88672 100644
--- a/unitary/alpha/quantum_world_test.py
+++ b/unitary/alpha/quantum_world_test.py
@@ -51,7 +51,7 @@ def test_get_object_by_name(compile_to_qubits):
     board = alpha.QuantumWorld([light, light2], compile_to_qubits=compile_to_qubits)
     assert board.get_object_by_name("test") == light
     assert board.get_object_by_name("test2") == light2
-    assert board.get_object_by_name("test3") == None
+    assert board.get_object_by_name("test3") is None
     assert board["test"] == light
     assert board["test2"] == light2
     with pytest.raises(KeyError):