add unit test for create_args

test/test_container_engine.py

@@ -7,7 +7,7 @@ from . import test_projects, utils
 basic_project = test_projects.new_c_project()
 
 
-def test(tmp_path, capfd, request):
+def test_podman(tmp_path, capfd, request):
     if utils.platform != "linux":
         pytest.skip("the test is only relevant to the linux build")
 
@@ -38,3 +38,29 @@ def test(tmp_path, capfd, request):
     # check that stdout is bring passed-though from container correctly
     captured = capfd.readouterr()
     assert "test log statement from before-all" in captured.out
+
+
+def test_create_args(tmp_path, capfd):
+    if utils.platform != "linux":
+        pytest.skip("the test is only relevant to the linux build")
+
+    project_dir = tmp_path / "project"
+    basic_project.generate(project_dir)
+
+    # build a manylinux wheel, using create_args to set an environment variable
+    actual_wheels = utils.cibuildwheel_run(
+        project_dir,
+        add_env={
+            "CIBW_BUILD": "cp310-manylinux_*",
+            "CIBW_BEFORE_ALL": "echo TEST_CREATE_ARGS is set to $TEST_CREATE_ARGS",
+            "CIBW_CONTAINER_ENGINE": "docker; create_args: --env=TEST_CREATE_ARGS=itworks",
+        },
+    )
+
+    expected_wheels = [
+        w for w in utils.expected_wheels("spam", "0.1.0") if ("cp310-manylinux" in w)
+    ]
+    assert set(actual_wheels) == set(expected_wheels)
+
+    captured = capfd.readouterr()
+    assert "TEST_CREATE_ARGS is set to itworks" in captured.out