CI: include test against ngihtly numpy

Author: martinfleis

.github/workflows/test_code.yml

@@ -14,6 +14,9 @@ jobs:
         os: [ubuntu-latest, windows-latest]
         python-version: ["3.8", "3.12"]
       fail-fast: false
+    defaults:
+      run:
+        shell: bash -l {0}
 
     steps:
     - uses: actions/checkout@v4
@@ -28,9 +31,15 @@ jobs:
           --file requirements-dev.txt
 
     - name: Install folium from source
-      shell: bash -l {0}
       run: python -m pip install -e . --no-deps --force-reinstall
 
     - name: Code tests
-      shell: bash -l {0}
       run: python -m pytest -vv --ignore=tests/selenium
+
+    - name: Install nightly version of numpy
+      run: python -m pip install --pre --index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple --extra-index-url https://pypi.org/simple numpy -U
+      if: runner.os == 'ubuntu-latest' && matrix.python-version == '3.12'
+
+    - name: Code tests with nightly numpy
+      run: python -m pytest -vv --ignore=tests/selenium
+      if: runner.os == 'ubuntu-latest' && matrix.python-version == '3.12'