diff --git a/tests/test_timer.py b/tests/test_timer.py
new file mode 100644
index 0000000..7a78abd
--- /dev/null
+++ b/tests/test_timer.py
@@ -0,0 +1,122 @@
+import asyncio
+
+import pytest
+
+from realtime._async.timer import AsyncTimer
+
+
+def linear_backoff(tries: int) -> int:
+    return tries * 0.1
+
+
+@pytest.mark.asyncio
+async def test_timer_initialization():
+    async def callback():
+        pass
+
+    timer = AsyncTimer(callback, linear_backoff)
+    assert timer.tries == 0
+    assert timer.timer is None
+    assert timer.callback == callback
+    assert timer.timer_calc == linear_backoff
+
+
+@pytest.mark.asyncio
+async def test_timer_schedule():
+    callback_called = False
+
+    async def callback():
+        nonlocal callback_called
+        callback_called = True
+
+    timer = AsyncTimer(callback, linear_backoff)
+    timer.schedule_timeout()
+
+    assert timer.tries == 1
+    assert timer.timer is not None
+    assert not timer.timer.done()
+
+    # Wait for the timer to complete
+    await timer.timer
+    assert callback_called
+
+
+@pytest.mark.asyncio
+async def test_timer_reset():
+    callback_called = False
+
+    async def callback():
+        nonlocal callback_called
+        callback_called = True
+
+    timer = AsyncTimer(callback, linear_backoff)
+    timer.schedule_timeout()
+
+    # Reset before the timer completes
+    timer.reset()
+    assert timer.tries == 0
+    assert timer.timer is None
+
+    # Wait a bit to ensure the original timer doesn't fire
+    await asyncio.sleep(0.2)
+    assert not callback_called
+
+
+@pytest.mark.asyncio
+async def test_timer_multiple_schedules():
+    callback_count = 0
+
+    async def callback():
+        nonlocal callback_count
+        callback_count += 1
+
+    timer = AsyncTimer(callback, linear_backoff)
+
+    # Schedule multiple times
+    timer.schedule_timeout()
+    timer.schedule_timeout()
+    timer.schedule_timeout()
+
+    assert timer.tries == 3
+    assert timer.timer is not None
+
+    # Wait for the last timer to complete
+    await timer.timer
+    assert callback_count == 1  # Only the last schedule should fire
+
+
+@pytest.mark.asyncio
+async def test_timer_callback_error():
+    error_caught = False
+
+    async def callback():
+        raise ValueError("Test error")
+
+    timer = AsyncTimer(callback, linear_backoff)
+    timer.schedule_timeout()
+
+    # Wait for the timer to complete
+    await timer.timer
+    # The error should be caught and logged, but not re-raised
+    assert timer.timer.done()
+
+
+@pytest.mark.asyncio
+async def test_timer_cancellation():
+    callback_called = False
+
+    async def callback():
+        nonlocal callback_called
+        callback_called = True
+
+    timer = AsyncTimer(callback, linear_backoff)
+    timer.schedule_timeout()
+
+    # Cancel the timer
+    timer.timer.cancel()
+
+    # Wait a bit to ensure the timer doesn't fire
+    await asyncio.sleep(0.2)
+    assert not callback_called
+    assert timer.timer.done()
+    assert timer.timer.cancelled()