Add basic workflow for windows/bazel test (#2039)

Add basic workflow for running conformance tests on windows.

Only run on post merge or manually for now.

Closes #2039

PiperOrigin-RevId: 925547950

Author: jnthntatum

.bazelrc

@@ -10,6 +10,8 @@ build:linux --copt=-Wno-deprecated-declarations
 # you will typically need to spell out the compiler for local dev
 # BAZEL_VC=<install directory>
 # BAZEL_VC_FULL_VERSION=14.44.3520
+# Some dependencies rely on bash so you will likely need msys2
+# BAZEL_SH=C:\msys64\usr\bin\bash.exe
 build:msvc --cxxopt="-std:c++20" --cxxopt="-utf-8" --host_cxxopt="-std:c++20"
 build:msvc --define=protobuf_allow_msvc=true
 build:msvc --test_tag_filters=-benchmark,-notap,-no_test_msvc

.github/workflows/windows_bazel_test.yml

@@ -0,0 +1,28 @@
+name: Windows Bazel Test
+
+on:
+  workflow_call:
+  workflow_dispatch:
+
+jobs:
+  test:
+    name: Run Bazel Tests
+    runs-on: windows-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+
+      - name: Setup Bazel and Bazelisk
+        uses: bazel-contrib/setup-bazel@0.19.0
+        with:
+          bazelisk-cache: true
+          disk-cache: ${{ github.workflow }}
+          repository-cache: true
+
+      - name: Run Tests
+        # msys2 'bash' on Windows will try to 'fix' the label prefix to
+        # work as a directory.
+        # //... won't work.
+        shell: bash
+        run: |
+          bazelisk test --config=msvc conformance:all

.github/workflows/windows_bazel_test_post_merge.yml

@@ -0,0 +1,13 @@
+name: Windows Bazel Test (Post-Merge)
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  trigger-test:
+    # This prevents the workflow from running automatically when someone
+    # pushes to their fork.
+    if: github.repository == 'google/cel-cpp'
+    uses: ./.github/workflows/windows_bazel_test.yml

conformance/BUILD

@@ -99,6 +99,7 @@ cc_library(
     deps = [
         ":service",
         ":utils",
+        "//internal:runfiles",
         "//internal:testing_no_main",
         "@com_google_absl//absl/flags:flag",
         "@com_google_absl//absl/log:absl_check",

conformance/run.bzl

@@ -77,7 +77,7 @@ def _conformance_test_args(modern, optimize, recursive, select_opt, skip_check,
 def _conformance_test(name, data, modern, optimize, recursive, select_opt, skip_check, skip_tests, tags, dashboard):
     cc_test(
         name = _conformance_test_name(name, optimize, recursive),
-        args = _conformance_test_args(modern, optimize, recursive, select_opt, skip_check, dashboard) + ["$(location " + test + ")" for test in data],
+        args = _conformance_test_args(modern, optimize, recursive, select_opt, skip_check, dashboard) + ["$(rlocationpath {})".format(test) for test in data],
         env = select(
             {
                 "@platforms//os:windows": {"CEL_SKIP_TESTS": ",".join(skip_tests + _TESTS_TO_SKIP_WINDOWS)},

conformance/run.cc

@@ -48,6 +48,7 @@
 #include "absl/types/span.h"
 #include "conformance/service.h"
 #include "conformance/utils.h"
+#include "internal/runfiles.h"
 #include "internal/testing.h"
 #include "cel/expr/conformance/test/simple.pb.h"
 #include "google/protobuf/io/zero_copy_stream_impl.h"
@@ -68,8 +69,6 @@ ABSL_FLAG(bool, select_optimization, false, "Enable select optimization.");
 
 namespace {
 
-using ::testing::IsEmpty;
-
 using cel::expr::conformance::test::SimpleTest;
 using cel::expr::conformance::test::SimpleTestFile;
 using google::api::expr::conformance::v1alpha1::CheckRequest;
@@ -78,6 +77,7 @@ using google::api::expr::conformance::v1alpha1::EvalRequest;
 using google::api::expr::conformance::v1alpha1::EvalResponse;
 using google::api::expr::conformance::v1alpha1::ParseRequest;
 using google::api::expr::conformance::v1alpha1::ParseResponse;
+using ::testing::IsEmpty;
 
 google::rpc::Code ToGrpcCode(absl::StatusCode code) {
   return static_cast<google::rpc::Code>(code);
@@ -282,8 +282,9 @@ int main(int argc, char** argv) {
       }
     }
     for (int argi = 1; argi < argc; argi++) {
+      std::string path = cel::internal::ResolveRunfilesPath(argv[argi]);
       ABSL_CHECK_OK(RegisterTestsFromFile(service, tests_to_skip,
-                                          absl::string_view(argv[argi])));
+                                          absl::string_view(path)));
     }
   }
   int exit_code = RUN_ALL_TESTS();

internal/BUILD

@@ -86,6 +86,17 @@ cc_library(
     ],
 )
 
+cc_library(
+    name = "runfiles",
+    srcs = ["runfiles.cc"],
+    hdrs = ["runfiles.h"],
+    deps = [
+        "@com_google_absl//absl/log:absl_check",
+        "@com_google_absl//absl/strings",
+        "@rules_cc//cc/runfiles",
+    ],
+)
+
 cc_library(
     name = "status_builder",
     hdrs = ["status_builder.h"],

internal/runfiles.cc

@@ -0,0 +1,40 @@
+// Copyright 2026 Google LLC
+//
+// 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
+//
+//     https://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.
+
+#include "internal/runfiles.h"
+
+#include <string>
+
+#include "rules_cc/cc/runfiles/runfiles.h"
+
+#include "absl/log/absl_check.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/string_view.h"
+
+namespace cel::internal {
+
+std::string ResolveRunfilesPath(absl::string_view path) {
+  using ::rules_cc::cc::runfiles::Runfiles;
+  static Runfiles* runfiles = []() {
+    std::string error;
+    auto runfiles =
+        Runfiles::CreateForTest(BAZEL_CURRENT_REPOSITORY, &error);
+    ABSL_QCHECK(runfiles != nullptr)
+        << absl::StrCat("failed to init runfiles", error);
+    return runfiles;
+  }();
+  return runfiles->Rlocation(std::string(path));
+}
+
+}  // namespace cel::internal

internal/runfiles.h

@@ -0,0 +1,30 @@
+// Copyright 2026 Google LLC
+//
+// 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
+//
+//     https://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.
+
+#ifndef THIRD_PARTY_CEL_CPP_INTERNAL_RUNFILES_H_
+#define THIRD_PARTY_CEL_CPP_INTERNAL_RUNFILES_H_
+
+#include <string>
+
+#include "absl/strings/string_view.h"
+
+namespace cel::internal {
+
+// Resolves a path relative to the runfiles directory.
+// Intended for resolving test cases from cel-spec and cel-policy.
+std::string ResolveRunfilesPath(absl::string_view path);
+
+}  // namespace cel::internal
+
+#endif  // THIRD_PARTY_CEL_CPP_INTERNAL_RUNFILES_H_