Add code coverage

.github/workflows/test.yml

@@ -34,13 +34,16 @@ jobs:
       run: python3 -m pip install --upgrade pip
 
     - name: Install ypywidgets in dev mode
-      run: |
-        pip install .[dev]
+      run: pip install .[dev]
 
     - name: Check types
-      run: |
-        mypy src
+      run: mypy src
 
     - name: Run tests
-      run: |
-        pytest ./tests -v --color=yes
+      run: pytest ./tests -v --color=yes
+
+    - name: Run code coverage
+        if: ${{ (matrix.python-version == '3.12') && (matrix.os == 'ubuntu-latest') }}
+        run: |
+          coverage run -m pytest tests
+          coverage report --fail-under=100

README.md

@@ -1,4 +1,5 @@
 [![Build Status](https://github.com/QuantStack/ypywidgets/workflows/test/badge.svg)](https://github.com/QuantStack/ypywidgets/actions)
+[![Code Coverage](https://img.shields.io/badge/coverage-100%25-green)](https://img.shields.io/badge/coverage-100%25-green)
 
 # ypywidgets: Y-based Jupyter widgets for Python
 

pyproject.toml

@@ -21,6 +21,7 @@ dependencies = [
     "comm >=0.1.4,<1",
     "pycrdt >=0.9.0,<0.10.0",
     "reacttrs >=0.2.1,<0.3.0",
+    "coverage >=7.0.0,<8.0.0",
 ]
 
 [project.urls]
@@ -36,3 +37,9 @@ dev = [
 [tool.hatch.build.targets.wheel]
 ignore-vcs = true
 packages = ["src/ypywidgets"]
+
+[tool.coverage.run]
+source = ["src/ypywidgets", "tests"]
+
+[tool.coverage.report]
+show_missing = true

src/ypywidgets/__init__.py

@@ -6,5 +6,5 @@
 
 try:
     __version__ = importlib.metadata.version("ypywidgets")
-except importlib.metadata.PackageNotFoundError:
+except importlib.metadata.PackageNotFoundError:  # pragma: no cover
     __version__ = "unknown"

src/ypywidgets/comm.py

@@ -76,7 +76,7 @@ def __init__(
         self._comm = create_widget_comm(comm_data, comm_metadata, comm_id)
         CommProvider(self.ydoc, self._comm)
 
-    def _repr_mimebundle_(self, **kwargs):
+    def _repr_mimebundle_(self, **kwargs):  # pragma: nocover
         plaintext = repr(self)
         if len(plaintext) > 110:
             plaintext = plaintext[:110] + '…'

src/ypywidgets/widget.py

@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from pycrdt import Doc, Map, Text
+from pycrdt import Doc, MapEvent, Map, Text
 
 
 class Widget:
@@ -9,17 +9,17 @@ class Widget:
     ydoc: Doc
 
     def __init__(self, ydoc: Doc | None = None) -> None:
-        if self._initialized:
+        if self._initialized:  # pragma: nocover
             return
         self._initialized = True
         self.ydoc = Doc() if ydoc is None else ydoc
         self.ydoc["_attrs"] = self._attrs = Map()
         self.ydoc["_model_name"] = Text()
         self._attrs.observe(self._set_attr)
-        for k, v in self._attrs.items():
+        for k, v in self._attrs.items():  # pragma: nocover
             setattr(self, k, v)
 
-    def _set_attr(self, event):
+    def _set_attr(self, event: MapEvent):
         for k, v in event.keys.items():
             new_value = v["newValue"]
             if getattr(self, k) != new_value:

tests/conftest.py

@@ -96,5 +96,5 @@ async def get_widget(self, timeout=0.1):
             if self.widget:
                 return self.widget
             await asyncio.sleep(0)
-            if time.monotonic() - t > timeout:
+            if time.monotonic() - t > timeout:  # pragma: nocover
                 raise TimeoutError("Timeout waiting for widget")