diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 000000000..505631475
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,11 @@
+import pytest
+
+LAST = "test_last.py"
+
+
+def pytest_collection_modifyitems(
+    items: list[pytest.Function],
+) -> list[pytest.Function]:
+    return [i for i in items if i.module.__name__ != LAST] + [
+        i for i in items if i.module.__name__ == LAST
+    ]
diff --git a/tests/test_last.py b/tests/test_last.py
new file mode 100644
index 000000000..040a7c40a
--- /dev/null
+++ b/tests/test_last.py
@@ -0,0 +1,6 @@
+from tests.utils_for_testbook import TESTED_NOTEBOOKS
+from tests.utils_for_tests import iterate_notebook_names
+
+
+def test_are_all_notebooks_tested():
+    assert sorted(TESTED_NOTEBOOKS) == sorted(iterate_notebook_names())
diff --git a/tests/utils_for_testbook.py b/tests/utils_for_testbook.py
index 1bf25fc79..510d22387 100644
--- a/tests/utils_for_testbook.py
+++ b/tests/utils_for_testbook.py
@@ -18,6 +18,8 @@
 
 _PATCHED = False
 
+TESTED_NOTEBOOKS: list[str] = []
+
 
 def wrap_testbook(notebook_name: str, timeout_seconds: float = 10) -> Callable:
     def inner_decorator(func: Callable) -> Any:
@@ -26,6 +28,7 @@ def inner_decorator(func: Callable) -> Any:
         notebook_path = resolve_notebook_path(notebook_name)
 
         for decorator in [
+            _build_mark_as_tested(notebook_name),
             testbook(notebook_path, execute=True, timeout=timeout_seconds),
             _build_cd_decorator(notebook_path),
             _build_skip_decorator(notebook_path),
@@ -62,6 +65,19 @@ def _build_skip_decorator(notebook_path: str) -> Callable:
     )
 
 
+def _build_mark_as_tested(notebook_name: str) -> Callable:
+    def mark_as_tested_decorator(func: Callable) -> Any:
+        def inner(*args: Any, **kwargs: Any) -> Any:
+            try:
+                func(*args, **kwargs)
+            finally:
+                TESTED_NOTEBOOKS.append(notebook_name)
+
+        return inner
+
+    return mark_as_tested_decorator
+
+
 def _patch_testbook() -> None:
     global _PATCHED