[bazel] Add include-cleaner tests (#111924)

Author: keith

utils/bazel/llvm-project-overlay/clang-tools-extra/include-cleaner/BUILD.bazel

@@ -2,7 +2,9 @@
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
+load("@bazel_skylib//rules:expand_template.bzl", "expand_template")
 load("@rules_cc//cc:defs.bzl", "cc_binary", "cc_library")
+load("//llvm:lit_test.bzl", "lit_test", "package_path")
 
 package(
     default_visibility = ["//visibility:public"],
@@ -61,3 +63,71 @@ cc_binary(
         "//llvm:Support",
     ],
 )
+
+cc_test(
+    name = "unittests",
+    srcs = glob(["unittests/*.cpp"]),
+    deps = [
+        ":include_cleaner",
+        ":include_cleaner_internal",
+        "//clang:ast",
+        "//clang:basic",
+        "//clang:format",
+        "//clang:frontend",
+        "//clang:lex",
+        "//clang:serialization",
+        "//clang:testing",
+        "//clang:tooling",
+        "//clang:tooling_inclusions",
+        "//llvm:Support",
+        "//llvm:TestingAnnotations",
+        "//third-party/unittest:gmock",
+        "//third-party/unittest:gtest",
+    ],
+)
+
+LLVM_LIT_PATH_FUNCTION = " " + \
+                         "# Allow generated file to be relocatable.\n" + \
+                         "from pathlib import Path\n" + \
+                         "def path(p):\n" + \
+                         "    p = Path(p)\n" + \
+                         "    if p.exists: return str(p.resolve())\n" + \
+                         "    if not p: return ''\n" + \
+                         "    return str((Path(__file__).parent / p).resolve())\n"
+
+LIT_SITE_CFG_IN_HEADER = "# Autogenerated, do not edit." + LLVM_LIT_PATH_FUNCTION
+
+expand_template(
+    name = "lit_site_cfg_py",
+    testonly = True,
+    out = "test/lit.site.cfg.py",
+    substitutions = {
+        "@CMAKE_CURRENT_BINARY_DIR@": package_path("//clang-tools-extra/include-cleaner:BUILD") + "/test",
+        "@CMAKE_CURRENT_SOURCE_DIR@": package_path("//clang-tools-extra/include-cleaner:BUILD") + "/test",
+        "@CURRENT_TOOLS_DIR@": package_path("//clang-tools-extra/include-cleaner:BUILD"),
+        "@LIT_SITE_CFG_IN_HEADER@": LIT_SITE_CFG_IN_HEADER,
+        "@LLVM_LIBS_DIR@": package_path("//llvm:BUILD"),
+        "@LLVM_LIT_TOOLS_DIR@": package_path("//llvm:BUILD"),
+        "@LLVM_TOOLS_DIR@": package_path("//llvm:BUILD"),
+        "@TARGET_TRIPLE@": "",
+        '"@Python3_EXECUTABLE@"': "sys.executable",
+    },
+    template = "test/lit.site.cfg.py.in",
+)
+
+[
+    lit_test(
+        name = "%s.test" % src,
+        srcs = [src],
+        data = glob(["test/Inputs/**/*"]) + [
+            "test/lit.cfg.py",
+            "test/lit.site.cfg.py",
+            ":clang-include-cleaner",
+            "//llvm:FileCheck",
+            "//llvm:count",
+            "//llvm:not",
+        ],
+        args = ["-svv"],
+    )
+    for src in glob(["test/*.cpp"])
+]