feat: stricter selector parsing, refactor to platforms module (#2291)

* feat: stricter selector parsing, refactor to `platforms` module

- Use a different method to build nothing
- Make the check aware of enable groups

* optimise unit tests - a specific platform module API for all configs

Unit test time: 26.2s -> 13.1s

* Remove unnecessary get_platform_module function

unit_test/main_tests/main_options_test.py

@@ -50,22 +50,49 @@ def test_output_dir_argument(also_set_environment, intercepted_build_args, monke
 
 @pytest.mark.usefixtures("platform", "allow_empty")
 def test_build_selector(intercepted_build_args, monkeypatch):
-    BUILD = "some build* *-selector"
-    SKIP = "some skip* *-selector"
-
-    monkeypatch.setenv("CIBW_BUILD", BUILD)
-    monkeypatch.setenv("CIBW_SKIP", SKIP)
+    monkeypatch.setenv("CIBW_BUILD", "cp313-*")
+    monkeypatch.setenv("CIBW_SKIP", "cp39-*")
 
     main()
 
     intercepted_build_selector = intercepted_build_args.args[0].globals.build_selector
     assert isinstance(intercepted_build_selector, BuildSelector)
-    assert intercepted_build_selector("build24-this")
-    assert not intercepted_build_selector("skip65-that")
+    assert intercepted_build_selector("cp313-something-to-build")
+    assert not intercepted_build_selector("cp39-something-to-skip")
     # This unit test is just testing the options of 'main'
     # Unit tests for BuildSelector are in build_selector_test.py
 
 
+@pytest.mark.usefixtures("platform", "allow_empty")
+def test_invalid_build_selector(monkeypatch, capsys):
+    monkeypatch.setenv("CIBW_BUILD", "invalid")
+
+    with pytest.raises(SystemExit) as e:
+        main()
+
+    assert e.value.code == 2
+    _, err = capsys.readouterr()
+    assert "Invalid build selector" in err
+
+
+@pytest.mark.parametrize(
+    ("option_name", "option_env_var"),
+    [
+        ("skip", "CIBW_SKIP"),
+        ("test_skip", "CIBW_TEST_SKIP"),
+    ],
+)
+@pytest.mark.usefixtures("platform", "intercepted_build_args")
+def test_invalid_skip_selector(monkeypatch, capsys, option_name, option_env_var):
+    monkeypatch.setenv(option_env_var, "invalid")
+
+    main()
+
+    _, err = capsys.readouterr()
+    print(err)
+    assert f"Invalid {option_name} selector" in err
+
+
 @pytest.mark.usefixtures("platform", "intercepted_build_args")
 def test_empty_selector(monkeypatch):
     monkeypatch.setenv("CIBW_SKIP", "*")
@@ -313,7 +340,7 @@ def test_build_selector_deprecated_error(monkeypatch, selector, pattern, capsys)
 
     stderr = capsys.readouterr().err
     series = "2" if "6" in pattern else "1"
-    msg = f"cibuildwheel 3.x no longer supports Python < 3.8. Please use the {series}.x series or update {selector}"
+    msg = f"cibuildwheel 3.x no longer supports Python < 3.8. Please use the {series}.x series or update"
     assert msg in stderr