diff --git a/tests/primitives/test_semaphore.py b/tests/primitives/test_semaphore.py
index 779586b4..936c3f3f 100644
--- a/tests/primitives/test_semaphore.py
+++ b/tests/primitives/test_semaphore.py
@@ -52,6 +52,7 @@ async def test_semaphore_cached_property(i: int):
     # We increased the threshold from 1.05 to 1.4 to help tests pass on slow github runners
     assert i == 1 or duration < 1.4
 
+
 @pytest.mark.asyncio_cooperative
 async def test_semaphore_acquire_release():
     semaphore = Semaphore(2)
@@ -60,6 +61,7 @@ async def test_semaphore_acquire_release():
     semaphore.release()
     assert semaphore._value == 2
 
+
 @pytest.mark.asyncio_cooperative
 async def test_semaphore_blocking():
     semaphore = Semaphore(1)
@@ -76,6 +78,7 @@ async def task():
     semaphore.release()
     await task1
 
+
 @pytest.mark.asyncio_cooperative
 async def test_semaphore_multiple_tasks():
     semaphore = Semaphore(2)
@@ -91,20 +94,22 @@ async def task(index):
     await asyncio.gather(*tasks)
     assert results == [0, 1, 2, 3]
 
+
 @pytest.mark.asyncio_cooperative
 async def test_semaphore_with_zero_initial_value():
     semaphore = Semaphore(0)
 
     async def task():
         await semaphore.acquire()
-        return 'done'
+        return "done"
 
     task1 = asyncio.create_task(task())
     await asyncio.sleep(0.1)
     assert not task1.done()
     semaphore.release()
     result = await task1
-    assert result == 'done'
+    assert result == "done"
+
 
 def test_semaphore_negative_initial_value():
     with pytest.raises(ValueError):
@@ -113,6 +118,8 @@ def test_semaphore_negative_initial_value():
         Semaphore(None)
     with pytest.raises(TypeError):
         Semaphore("None")
+
+
 """
 @pytest.mark.asyncio_cooperative
 async def test_semaphore_releasing_without_acquiring():
@@ -313,4 +320,4 @@ async def task():
     task1.cancel()
     await asyncio.sleep(0.1)
     assert semaphore._value == 1
-"""
\ No newline at end of file
+"""
diff --git a/tests/test_counter.py b/tests/test_counter.py
index 96973d53..e86e8517 100644
--- a/tests/test_counter.py
+++ b/tests/test_counter.py
@@ -5,34 +5,38 @@
 
 @pytest.mark.asyncio_cooperative
 async def test_counter_lock():
-    counter = CounterLock(name='test')
+    counter = CounterLock(name="test")
     assert await counter.wait_for(0)
     assert counter._name == "test"
 
+
 @pytest.mark.asyncio_cooperative
 async def test_counterlock_initialization():
     counter = CounterLock(start_value=5)
     assert counter.value == 5
 
+
 @pytest.mark.asyncio_cooperative
 async def test_counterlock_set():
     counter = CounterLock(start_value=0)
     counter.set(10)
     assert counter.value == 10
 
+
 @pytest.mark.asyncio_cooperative
 async def test_counterlock_wait_for():
     counter = CounterLock(start_value=0)
 
     async def waiter():
         await counter.wait_for(5)
-        return 'done'
+        return "done"
 
     waiter_task = asyncio.create_task(waiter())
     await asyncio.sleep(0.1)
     counter.set(5)
     result = await waiter_task
-    assert result == 'done'
+    assert result == "done"
+
 
 @pytest.mark.asyncio_cooperative
 async def test_counterlock_concurrent_waiters():
@@ -49,12 +53,14 @@ async def waiter(index):
     await asyncio.gather(*tasks)
     assert results == [0, 1, 2]
 
+
 @pytest.mark.asyncio_cooperative
 async def test_counterlock_increment_only():
     counter = CounterLock(start_value=5)
     with pytest.raises(ValueError):
         counter.set(3)
 
+
 @pytest.mark.asyncio_cooperative
 async def test_counterlock_large_value():
     counter = CounterLock(start_value=0)
@@ -62,11 +68,13 @@ async def test_counterlock_large_value():
     counter.set(large_value)
     assert counter.value == large_value
 
+
 @pytest.mark.asyncio_cooperative
 async def test_counterlock_zero_value():
     counter = CounterLock(start_value=0)
     assert counter.value == 0
 
+
 @pytest.mark.asyncio_cooperative
 async def test_counterlock_exception_handling():
     counter = CounterLock(start_value=0)
@@ -82,6 +90,7 @@ async def waiter():
     result = await waiter()
     assert result == "Intentional error"
 
+
 @pytest.mark.asyncio_cooperative
 async def test_simultaneous_set_and_wait():
     counter = CounterLock(start_value=0)
@@ -96,6 +105,7 @@ async def waiter(index):
     await asyncio.gather(*tasks)
     assert results == [0, 1, 2, 3, 4]
 
+
 @pytest.mark.asyncio_cooperative
 async def test_reentrant_set():
     counter = CounterLock(start_value=0)
@@ -103,10 +113,12 @@ async def test_reentrant_set():
     counter.set(10)  # Reentrant set
     assert counter.value == 10
 
+
 def test_counterlock_negative_start_value():
     with pytest.raises(ValueError):
         CounterLock(start_value=-1)
 
+
 @pytest.mark.asyncio_cooperative
 async def test_immediate_set_and_wait():
     counter = CounterLock(start_value=5)
@@ -117,19 +129,21 @@ async def waiter():
     result = await waiter()
     assert result is True
 
+
 @pytest.mark.asyncio_cooperative
 async def test_delayed_set():
     counter = CounterLock(start_value=0)
 
     async def waiter():
         await counter.wait_for(5)
-        return 'done'
+        return "done"
 
     waiter_task = asyncio.create_task(waiter())
     await asyncio.sleep(0.5)  # Delay before setting the counter
     counter.set(5)
     result = await waiter_task
-    assert result == 'done'
+    assert result == "done"
+
 
 @pytest.mark.asyncio_cooperative
 async def test_multiple_sets():
@@ -146,6 +160,7 @@ async def waiter(index):
     await asyncio.gather(*tasks)
     assert results == [0, 1, 2]
 
+
 @pytest.mark.asyncio_cooperative
 async def test_custom_error_handling():
     counter = CounterLock(start_value=0)
@@ -161,16 +176,17 @@ async def waiter():
     result = await waiter()
     assert result == "Custom error"
 
+
 @pytest.mark.asyncio_cooperative
 async def test_external_interruptions():
     counter = CounterLock(start_value=0)
 
     async def waiter():
         await counter.wait_for(5)
-        return 'done'
+        return "done"
 
     waiter_task = asyncio.create_task(waiter())
     await asyncio.sleep(0.1)
     waiter_task.cancel()
     await asyncio.sleep(0.1)
-    assert counter.value == 0
\ No newline at end of file
+    assert counter.value == 0