Use the ARCHS option to select universal2/arm64 builds

test/test_macos_archs.py

@@ -0,0 +1,25 @@
+import pytest
+
+from . import test_projects, utils
+
+basic_project = test_projects.new_c_project()
+
+
+def test_cross_compiled_build(tmp_path):
+    if utils.platform != 'macos':
+        pytest.skip('this test is only relevant to macos')
+
+    project_dir = tmp_path / 'project'
+    basic_project.generate(project_dir)
+
+    actual_wheels = utils.cibuildwheel_run(project_dir, add_env={
+        'CIBW_ARCHS': 'x86_64, universal2, arm64',
+    })
+
+    expected_wheels = (
+        utils.expected_wheels('spam', '0.1.0', machine_arch='x86_64')
+        + utils.expected_wheels('spam', '0.1.0', machine_arch='arm64')
+    )
+    assert set(actual_wheels) == set(expected_wheels)
+
+# TODO: add a TEST_COMMAND test when using cross-compiling