ci: test on iOS (#5705)

* ci: add iOS

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* Update .github/workflows/tests-cibw.yml

* ci: use test groups

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

---------

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

.github/workflows/tests-cibw.yml

@@ -1,4 +1,4 @@
-name: WASM
+name: CIBW
 
 on:
   workflow_dispatch:
@@ -15,16 +15,33 @@ concurrency:
 jobs:
   build-wasm-emscripten:
     name: Pyodide wheel
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
       with:
         submodules: true
         fetch-depth: 0
 
-    - uses: pypa/cibuildwheel@v2.23
+    - uses: pypa/cibuildwheel@c90accef518b1dd0253bf43b639ce21f765d6794
       env:
         PYODIDE_BUILD_EXPORTS: whole_archive
       with:
         package-dir: tests
         only: cp312-pyodide_wasm32
+
+  build-ios:
+    name: iOS wheel
+    runs-on: macos-latest
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        submodules: true
+        fetch-depth: 0
+
+    - run: brew upgrade cmake
+
+    - uses: pypa/cibuildwheel@c90accef518b1dd0253bf43b639ce21f765d6794
+      env:
+        CIBW_PLATFORM: ios
+      with:
+        package-dir: tests

tests/pyproject.toml

@@ -8,10 +8,29 @@ build-backend = "scikit_build_core.build"
 [project]
 name = "pybind11_tests"
 version = "0.0.1"
-dependencies = ["pytest", "pytest-timeout", "numpy", "scipy"]
+dependencies = ["pytest", "pytest-timeout"]
+
+
+[dependency-groups]
+numpy = ["numpy"]
+scipy = ["scipy"]
+
+
+[tool.scikit-build]
+build.verbose = true
+logging.level = "INFO"
 
 [tool.scikit-build.cmake.define]
 PYBIND11_FINDPYTHON = true
 
+
 [tool.cibuildwheel]
-test-command = "pytest -o timeout=0 -p no:cacheprovider {project}/tests/test_*.py"
+test-sources = ["tests", "pyproject.toml"]
+test-command = "python -m pytest -o timeout=0 -p no:cacheprovider tests"
+environment.PIP_ONLY_BINARY = "numpy"
+environment.PIP_PREFER_BINARY = "1"
+pyodide.test-groups = ["numpy", "scipy"]
+ios.test-groups = ["numpy"]
+ios.xbuild-tools = ["cmake", "ninja"]
+ios.environment.PIP_EXTRA_INDEX_URL = "https://pypi.anaconda.org/beeware/simple"
+ios.config-settings."cmake.define.CMAKE_CXX_FLAGS" = "-DPYBIND11_HAS_SUBINTERPRETER_SUPPORT=0"