diff --git a/tests/units/tokens/abstract/test_abstract_token.py b/tests/units/tokens/abstract/test_abstract_token.py
index d4f285d..b789bd5 100644
--- a/tests/units/tokens/abstract/test_abstract_token.py
+++ b/tests/units/tokens/abstract/test_abstract_token.py
@@ -229,10 +229,14 @@ def test_add_temp_token_and_not_temp_token(first_token_class, second_token_class
     second_token = second_token_class(*second_arguments)
     tokens_sum = first_token_class(*first_arguments) + second_token
 
-    assert isinstance(tokens_sum, first_token_class)
-    assert len(tokens_sum.tokens) == 1
-    assert isinstance(tokens_sum.tokens[0], second_token_class)
-    assert len(tokens_sum.tokens[0].tokens) == 0
+    if first_token_class is TimeoutToken and second_token_class is TimeoutToken:
+        assert isinstance(tokens_sum, TimeoutToken)
+        assert len(tokens_sum.tokens) == 0
+    else:
+        assert isinstance(tokens_sum, first_token_class)
+        assert len(tokens_sum.tokens) == 1
+        assert isinstance(tokens_sum.tokens[0], second_token_class)
+        assert len(tokens_sum.tokens[0].tokens) == 0
 
 
 @pytest.mark.parametrize(
diff --git a/tests/units/tokens/test_timeout_token.py b/tests/units/tokens/test_timeout_token.py
index 0371ae3..2368244 100644
--- a/tests/units/tokens/test_timeout_token.py
+++ b/tests/units/tokens/test_timeout_token.py
@@ -341,11 +341,8 @@ def test_bigger_temp_timeout_token_plus_less_temp_timeout_token_with_same_monoto
     token = TimeoutToken(2, **addictional_kwargs) + TimeoutToken(1, **addictional_kwargs)
 
     assert isinstance(token, TimeoutToken)
-    assert token.timeout == 2
-    assert len(token.tokens) == 1
-    assert len(token.tokens[0].tokens) == 0
-    assert isinstance(token.tokens[0], TimeoutToken)
-    assert token.tokens[0].timeout == 1
+    assert token.timeout == 1
+    assert len(token.tokens) == 0
 
 
 @pytest.mark.parametrize(
@@ -514,12 +511,8 @@ def test_bigger_temp_timeout_token_plus_less_timeout_token_with_same_monotonic_f
     token = TimeoutToken(2, **addictional_kwargs) + right_timeout_token
 
     assert isinstance(token, TimeoutToken)
-    assert token.timeout == 2
-    assert len(token.tokens) == 1
-    assert len(token.tokens[0].tokens) == 0
-    assert isinstance(token.tokens[0], TimeoutToken)
-    assert token.tokens[0].timeout == 1
-    assert token.tokens[0] is right_timeout_token
+    assert token.timeout == 1
+    assert len(token.tokens) == 0
 
 
 @pytest.mark.parametrize(