diff --git a/CHANGELOG.md b/CHANGELOG.md
index d824c3c..6e6538d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,11 +5,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [0.1.0] - 2025-02-14
 
 ### Added  
 
-- Pytest plugin can collect jupyter notebooks and cells which use the `%%ipytest` magic
+- Pytest plugin collects jupyter notebooks and cells which use the `%%ipytest` magic
 - Published documentation for `CollectionTree`.
 
 ## [0.0.2] - 2025-02-12
diff --git a/__pyversion__ b/__pyversion__
index 6812f81..6c6aa7c 100644
--- a/__pyversion__
+++ b/__pyversion__
@@ -1 +1 @@
-0.0.3
\ No newline at end of file
+0.1.0
\ No newline at end of file
diff --git a/pytest_ipynb2/plugin.py b/pytest_ipynb2/plugin.py
index db8edc7..f1a8735 100644
--- a/pytest_ipynb2/plugin.py
+++ b/pytest_ipynb2/plugin.py
@@ -43,17 +43,19 @@ def collect(self) -> Generator[Cell, None, None]:
 class Cell(pytest.Module):
     """
     A collector for jupyter notebook cells.
-    
+
     `pytest` will recognise these cells as `pytest.Module`s and use standard collection on them as it would any other
     python module.
     """
 
     def _getobj(self) -> ModuleType:
         notebook = self.stash[ipynb2_notebook]
+        cellsabove = [source for cellid, source in notebook.getcodecells().items() if cellid < int(self.nodeid)]
+        othercells = "\n".join(cellsabove)
         cellsource = notebook.gettestcells()[int(self.nodeid)]
         cellspec = importlib.util.spec_from_loader(f"Cell{self.name}", loader=None)
         cell = importlib.util.module_from_spec(cellspec)
-        exec(cellsource, cell.__dict__)  # noqa: S102
+        exec(f"{othercells}\n{cellsource}", cell.__dict__)  # noqa: S102
         return cell
 
 
diff --git a/pytest_ipynb2/pytester_helpers.py b/pytest_ipynb2/pytester_helpers.py
index 92c7e38..bb6d193 100644
--- a/pytest_ipynb2/pytester_helpers.py
+++ b/pytest_ipynb2/pytester_helpers.py
@@ -27,7 +27,7 @@ class CollectionTree:
     """
 
     @classmethod
-    #TODO(MusicalNinjaDad): #8 Refactor CollectionTree.from_items to be easier to understand.
+    # TODO(MusicalNinjaDad): #8 Refactor CollectionTree.from_items to be easier to understand.
     def from_items(cls, items: list[pytest.Item]) -> Self:
         """Create a CollectionTree from a list of collection items, as returned by `pytester.genitems()`."""
 
diff --git a/tests/test_runtests.py b/tests/test_runtests.py
new file mode 100644
index 0000000..3700f9e
--- /dev/null
+++ b/tests/test_runtests.py
@@ -0,0 +1,73 @@
+from pathlib import Path
+from typing import TYPE_CHECKING
+
+import pytest
+
+from pytest_ipynb2.pytester_helpers import CollectedDir, ExampleDir
+
+if TYPE_CHECKING:
+    from pytest_ipynb2.plugin import Cell
+
+
+@pytest.mark.parametrize(
+    ["example_dir", "outcomes"],
+    [
+        pytest.param(
+            ExampleDir(
+                files=[Path("tests/assets/notebook.ipynb").absolute()],
+                conftest="pytest_plugins = ['pytest_ipynb2.plugin']",
+            ),
+            {
+                "passed": 2,
+            },
+            id="Simple Notebook",
+        ),
+        pytest.param(
+            ExampleDir(
+                files=[Path("tests/assets/notebook_2tests.ipynb").absolute()],
+                conftest="pytest_plugins = ['pytest_ipynb2.plugin']",
+            ),
+            {
+                "passed": 3,
+            },
+            id="Notebook 2 test cells",
+        ),
+        pytest.param(
+            ExampleDir(
+                files=[
+                    Path("tests/assets/notebook_2tests.ipynb").absolute(),
+                    Path("tests/assets/notebook.ipynb").absolute(),
+                ],
+                conftest="pytest_plugins = ['pytest_ipynb2.plugin']",
+            ),
+            {
+                "passed": 5,
+            },
+            id="Both notebooks - unsorted",
+        ),
+    ],
+    indirect=["example_dir"],
+)
+def test_runtests(example_dir: CollectedDir, outcomes: dict):
+    results = example_dir.pytester_instance.runpytest()
+    results.assert_outcomes(**outcomes)
+
+
+@pytest.mark.parametrize(
+    "example_dir",
+    [
+        pytest.param(
+            ExampleDir(
+                files=[Path("tests/assets/notebook.ipynb").absolute()],
+                conftest="pytest_plugins = ['pytest_ipynb2.plugin']",
+            ),
+            id="Simple Notebook",
+        ),
+    ],
+    indirect=True,
+)
+def test_cellmodule_contents(example_dir: CollectedDir):
+    cell: Cell = example_dir.items[0].parent
+    expected_attrs = ["x", "y", "adder", "test_adder", "test_globals"]
+    public_attrs = [attr for attr in cell._obj.__dict__ if not attr.startswith("__")]  # noqa: SLF001
+    assert public_attrs == expected_attrs