Fix the select statements

Test that the generated selects are actually correct

python/config_settings/config_settings.bzl

@@ -95,7 +95,7 @@ def construct_config_settings(name, python_versions):
             )
             native.alias(
                 name = is_micro_version_name,
-                actual = "_is_python_" + minor_version,
+                actual = "_" + is_micro_version_name,
                 visibility = ["//visibility:public"],
             )
             matches_minor_version_names.append(equals_micro_name)

tests/toolchains/BUILD.bazel

@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+load("@bazel_skylib//rules:diff_test.bzl", "diff_test")
 load(":defs.bzl", "acceptance_tests")
 load(":versions_test.bzl", "versions_test_suite")
 

tests/toolchains/config_settings/BUILD.bazel

@@ -0,0 +1,54 @@
+# Copyright 2024 The Bazel Authors. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+load("@bazel_skylib//rules:diff_test.bzl", "diff_test")
+
+# Do bazel query for the following targets and put the results into a file
+_TARGETS = [
+    "is_python_3.12.0",
+    "is_python_3.12.1",
+    "_is_python_3.12.1",
+    "_python_version_flag_equals_3.12.1",
+    "_python_version_flag_equals_3.12",
+]
+
+[
+    genquery(
+        name = target,
+        expression = "//python/config_settings:" + target,
+        opts=["--output=build"],
+        scope = ["//python/config_settings:" + target],
+    )
+    for target in _TARGETS
+]
+
+genrule(
+    name = "config_settings_query",
+    srcs = _TARGETS,
+    outs = ["config_settings_query.txt"],
+    # Strip comments that are specific to the host it is being run on and make the
+    # expectation output more maintainable.
+    cmd = "sed -e '/^#/d' -e '/^  generator_/d' $(SRCS) >$@",
+    target_compatible_with = select({
+        # We don't have sed available on Windows
+        "@platforms//os:windows": ["@platforms//:incompatible"],
+        "//conditions:default": [],
+    }),
+)
+
+diff_test(
+    name = "config_settings_test",
+    file1 = "want",
+    file2 = "config_settings_query",
+)

tests/toolchains/config_settings/want

@@ -0,0 +1,27 @@
+config_setting(
+  name = "is_python_3.12.0",
+  visibility = ["//visibility:public"],
+  flag_values = {"//python/config_settings:python_version": "3.12.0"},
+)
+
+alias(
+  name = "is_python_3.12.1",
+  visibility = ["//visibility:public"],
+  actual = "//python/config_settings:_is_python_3.12.1",
+)
+
+alias(
+  name = "_is_python_3.12.1",
+  actual = select({"//python/config_settings:_python_version_flag_equals_3.12.1": "//python/config_settings:_python_version_flag_equals_3.12.1", "//conditions:default": "//python/config_settings:_python_version_flag_equals_3.12"}),
+)
+
+config_setting(
+  name = "_python_version_flag_equals_3.12.1",
+  flag_values = {"//python/config_settings:python_version": "3.12.1"},
+)
+
+config_setting(
+  name = "_python_version_flag_equals_3.12",
+  flag_values = {"//python/config_settings:python_version": "3.12"},
+)
+