diff --git a/tests/utils/test_ophyd_async_connect.py b/tests/utils/test_ophyd_async_connect.py
new file mode 100644
index 000000000..f9cdf7006
--- /dev/null
+++ b/tests/utils/test_ophyd_async_connect.py
@@ -0,0 +1,69 @@
+import asyncio
+import unittest
+
+from blueapi.utils.ophyd_async_connect import format_error_message
+from blueapi.worker.task import Task
+
+_SIMPLE_TASK = Task(name="sleep", params={"time": 0.0})
+_LONG_TASK = Task(name="sleep", params={"time": 1.0})
+
+
+class TestFormatErrorMessage(unittest.TestCase):
+    def setUp(self):
+        # Setup the asyncio event loop for each test
+        self.loop = asyncio.new_event_loop()
+        asyncio.set_event_loop(self.loop)
+
+    def tearDown(self):
+        # Close the loop at the end of each test
+        self.loop.close()
+
+    async def _create_task_with_exception(self, exception):
+        """Helper coroutine to create a task that raises an exception."""
+
+        async def raise_exception():
+            raise exception
+
+        task = self.loop.create_task(raise_exception())
+        await asyncio.sleep(0.1)  # Allow time for the task to raise the exception
+        return task
+
+    def test_format_error_message_single_line(self):
+        # Test formatting with an exception that has a single-line message
+        exception = ValueError("A single-line error")
+        task = self.loop.run_until_complete(self._create_task_with_exception(exception))
+        tasks = {task: "Task1"}
+        expected_output = "\n  Task1: ValueError: A single-line error"
+        self.assertEqual(format_error_message(tasks, task), expected_output)
+
+    def test_format_error_message_multi_line(self):
+        # Test formatting with an exception that has a multi-line message
+        exception = ValueError("A multi-line\nerror message")
+        task = self.loop.run_until_complete(self._create_task_with_exception(exception))
+        tasks = {task: "Task2"}
+        expected_output = "\n  Task2: ValueError\n    A multi-line\n    error message"
+        self.assertEqual(format_error_message(tasks, task), expected_output)
+
+    def test_format_error_message_simple_task_failure(self):
+        # Test formatting with the _SIMPLE_TASK key and a failing asyncio task
+        exception = RuntimeError("Simple task error")
+        failing_task = self.loop.run_until_complete(
+            self._create_task_with_exception(exception)
+        )
+        tasks = {failing_task: _SIMPLE_TASK.name}
+        expected_output = "\n  sleep: RuntimeError: Simple task error"
+        self.assertEqual(format_error_message(tasks, failing_task), expected_output)
+
+    def test_format_error_message_long_task_failure(self):
+        # Test formatting with the _LONG_TASK key and a failing asyncio task
+        exception = RuntimeError("Long task error")
+        failing_task = self.loop.run_until_complete(
+            self._create_task_with_exception(exception)
+        )
+        tasks = {failing_task: _LONG_TASK.name}
+        expected_output = "\n  sleep: RuntimeError: Long task error"
+        self.assertEqual(format_error_message(tasks, failing_task), expected_output)
+
+
+if __name__ == "__main__":
+    unittest.main()