Add temporary CI run using matplotlib-inline's entry-point code

.github/workflows/test.yml

@@ -1,100 +1,115 b''
 name: Run tests
 
 on:
   push:
     branches:
       - main
       - '*.x'
   pull_request:
   # Run weekly on Monday at 1:23 UTC
   schedule:
   - cron:  '23 1 * * 1'
   workflow_dispatch:
 
 
 jobs:
   test:
     runs-on: ${{ matrix.os }}
     # Disable scheduled CI runs on forks
     if: github.event_name != 'schedule' || github.repository_owner == 'ipython'
     strategy:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest]
         python-version: ["3.10", "3.11", "3.12"]
         deps: [test_extra]
         # Test all on ubuntu, test ends on macos
         include:
           - os: macos-latest
             python-version: "3.10"
             deps: test_extra
           - os: macos-latest
             python-version: "3.11"
             deps: test_extra
           # Tests minimal dependencies set
           - os: ubuntu-latest
             python-version: "3.11"
             deps: test
           # Tests latest development Python version
           - os: ubuntu-latest
             python-version: "3.13-dev"
             deps: test
           # Installing optional dependencies stuff takes ages on PyPy
           - os: ubuntu-latest
             python-version: "pypy-3.10"
             deps: test
           - os: windows-latest
             python-version: "pypy-3.10"
             deps: test
           - os: macos-latest
             python-version: "pypy-3.10"
             deps: test
+          # Temporary CI run to use entry point compatible code in matplotlib-inline.
+          - os: ubuntu-latest
+            python-version: "3.12"
+            deps: test_extra
+            want-latest-entry-point-code: true
 
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
         cache: pip
         cache-dependency-path: |
           pyproject.toml
     - name: Install latex
       if: runner.os == 'Linux' && matrix.deps == 'test_extra'
       run: echo "disable latex for now, issues in mirros" #sudo apt-get -yq -o Acquire::Retries=3 --no-install-suggests --no-install-recommends install texlive dvipng
     - name: Install and update Python dependencies (binary only)
       if: ${{ ! contains( matrix.python-version, 'dev' ) }}
       run: |
         python -m pip install --only-binary ':all:' --upgrade pip setuptools wheel build
         python -m pip install --only-binary ':all:' --no-binary curio --upgrade -e .[${{ matrix.deps }}]
         python -m pip install --only-binary ':all:' --upgrade check-manifest pytest-cov  pytest-json-report 'pytest<8'
     - name: Install and update Python dependencies (dev?)
       if: ${{ contains( matrix.python-version, 'dev' ) }}
       run: |
         python -m pip install --pre --upgrade pip setuptools wheel build
         python -m pip install --pre --extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple --no-binary curio --upgrade -e .[${{ matrix.deps }}]
         python -m pip install --pre --extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple --upgrade check-manifest pytest-cov  pytest-json-report
     - name: Try building with Python build
       if: runner.os != 'Windows'  # setup.py does not support sdist on Windows
       run: |
         python -m build
         shasum -a 256 dist/*
     - name: Check manifest
       if: runner.os != 'Windows'  # setup.py does not support sdist on Windows
       run: check-manifest
+
+    - name: Install entry point compatible code (TEMPORARY)
+      if: matrix.want-latest-entry-point-code
+      run: |
+        python -m pip list
+        # Not installing matplotlib's entry point code as building matplotlib from source is complex.
+        # Rely upon matplotlib to test all the latest entry point branches together.
+        python -m pip install --upgrade git+https://github.com/ipython/matplotlib-inline.git@main
+        python -m pip list
+
     - name: pytest
       env:
         COLUMNS: 120
       run: |
         pytest --color=yes -raXxs ${{ startsWith(matrix.python-version, 'pypy') && ' ' || '--cov --cov-report=xml' }} --json-report --json-report-file=./report-${{ matrix.python-version }}-${{runner.os}}.json --maxfail=15
     - uses: actions/upload-artifact@v3
       with:
           name: upload pytest timing reports as json
           path: |
             ./report-*.json
 
     - name: Upload coverage to Codecov
       uses: codecov/codecov-action@v3
       with:
          name: Test
          files: /home/runner/work/ipython/ipython/coverage.xml