Use the platform object itself as the interface

unit_test/main_tests/conftest.py

@@ -85,9 +85,9 @@ def platform(request, monkeypatch):
 def intercepted_build_args(monkeypatch):
     intercepted = ArgsInterceptor()
 
-    monkeypatch.setattr(linux.interface, "build", intercepted)
-    monkeypatch.setattr(macos.interface, "build", intercepted)
-    monkeypatch.setattr(windows.interface, "build", intercepted)
+    monkeypatch.setattr(linux, "build", intercepted)
+    monkeypatch.setattr(macos, "build", intercepted)
+    monkeypatch.setattr(windows, "build", intercepted)
 
     yield intercepted
 

unit_test/options_test.py

@@ -7,7 +7,7 @@ from pathlib import Path
 
 import pytest
 
-from cibuildwheel.__main__ import get_build_identifiers, get_platform_interface
+from cibuildwheel.__main__ import get_build_identifiers, get_platform_module
 from cibuildwheel.bashlex_eval import local_environment_executor
 from cibuildwheel.environment import parse_environment
 from cibuildwheel.options import (
@@ -49,9 +49,9 @@ def test_options_1(tmp_path, monkeypatch):
 
     options = Options(platform="linux", command_line_arguments=args, env={})
 
-    interface = get_platform_interface("linux")
+    module = get_platform_module("linux")
     identifiers = get_build_identifiers(
-        interface=interface,
+        platform_module=module,
         build_selector=options.globals.build_selector,
         architectures=options.globals.architectures,
     )