Add image test using nbval and nbdime

.github/workflows/main.yml

@@ -24,24 +24,18 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
-    - name: Setup conda
-      uses: conda-incubator/setup-miniconda@v2
+    - name: Setup Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
-        mamba-version: "*"
-        auto-activate-base: false
-        channels: conda-forge
 
-    - name: Install dependencies
-      run: mamba install ipython matplotlib flake8
-
-    - name: Install package
-      run: pip install .
+    - name: Install package with test dependencies
+      run: pip install .[test]
 
     - name: Test installation
-      run: python -c 'from matplotlib_inline.backend_inline import show'
+      run: pytest -v
 
     - name: Test flake8
       run: flake8 matplotlib_inline --ignore=E501,W504,W503

.gitignore

@@ -2,3 +2,4 @@
 dist
 build
 __pycache__
+.ipynb_checkpoints

pyproject.toml

@@ -42,8 +42,30 @@ requires-python = ">=3.8"
 [project.entry-points."matplotlib.backend"]
 inline = "matplotlib_inline.backend_inline"
 
+[project.optional-dependencies]
+test = [
+    "flake8",
+    "matplotlib",
+    "nbdime",
+    "nbval",
+    "notebook",
+    "pytest",
+]
+
 [project.urls]
 Homepage = "https://github.com/ipython/matplotlib-inline"
 
 [tool.setuptools.dynamic]
 version = {attr = "matplotlib_inline.__version__"}
+
+[tool.pytest.ini_options]
+xfail_strict = true
+log_cli_level = "info"
+addopts = [
+    "--nbval",
+    "--nbdime",
+    "--ignore=tests/notebooks/.ipynb_checkpoints/*",
+]
+testpaths = [
+    "tests",
+]

tests/test_import.py

@@ -0,0 +1,3 @@
+def test_import():
+    from matplotlib_inline.backend_inline import show
+    show()