diff --git a/TODO b/TODO
index 4023049..5ea88bb 100644
--- a/TODO
+++ b/TODO
@@ -72,7 +72,7 @@ Description: implement a simple circular buffer
 ID: 3
 Type: bugfix
 Title: move unit tests to subdirectory
-Status: in-progress
+Status: done
 Priority: high
 Created: 2025-05-04
 Description: move the unit test suites to a unit/ subdirectory so that
diff --git a/tests/byteb4rb1e_utils/__init__.py b/tests/unit/__init__.py
similarity index 100%
rename from tests/byteb4rb1e_utils/__init__.py
rename to tests/unit/__init__.py
diff --git a/tests/byteb4rb1e_utils/io/__init__.py b/tests/unit/byteb4rb1e_utils/__init__.py
similarity index 100%
rename from tests/byteb4rb1e_utils/io/__init__.py
rename to tests/unit/byteb4rb1e_utils/__init__.py
diff --git a/tests/unit/byteb4rb1e_utils/io/__init__.py b/tests/unit/byteb4rb1e_utils/io/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/byteb4rb1e_utils/io/test_chunksio.py b/tests/unit/byteb4rb1e_utils/io/test_chunksio.py
similarity index 100%
rename from tests/byteb4rb1e_utils/io/test_chunksio.py
rename to tests/unit/byteb4rb1e_utils/io/test_chunksio.py