Add cel_cc_test demonstrating configuring a CelTestContext with a raw expression and custom cel::Compiler.

testing/testrunner/user_tests/BUILD

@@ -34,6 +34,33 @@ cc_library(
     alwayslink = True,
 )
 
+cc_library(
+    name = "raw_expression_user_test",
+    testonly = True,
+    srcs = ["raw_expression_test.cc"],
+    deps = [
+        "//checker:type_checker_builder",
+        "//common:decl",
+        "//common:type",
+        "//compiler",
+        "//compiler:compiler_factory",
+        "//compiler:standard_library",
+        "//internal:status_macros",
+        "//internal:testing_descriptor_pool",
+        "//runtime",
+        "//runtime:runtime_builder",
+        "//runtime:standard_runtime_builder_factory",
+        "//testing/testrunner:cel_expression_source",
+        "//testing/testrunner:cel_test_context",
+        "//testing/testrunner:cel_test_factories",
+        "@com_google_absl//absl/log:absl_check",
+        "@com_google_absl//absl/status:statusor",
+        "@com_google_absl//absl/strings:string_view",
+        "@com_google_cel_spec//proto/cel/expr/conformance/test:suite_cc_proto",
+        "@com_google_protobuf//:protobuf",
+    ],
+)
+
 cel_cc_test(
     name = "simple_test",
     filegroup = "//testing/testrunner/resources",
@@ -52,3 +79,10 @@ cel_cc_test(
         ":simple_user_test",
     ],
 )
+
+cel_cc_test(
+    name = "raw_expression_test_with_custom_test_suite",
+    deps = [
+        ":raw_expression_user_test",
+    ],
+)

testing/testrunner/user_tests/raw_expression_test.cc

@@ -0,0 +1,103 @@
+// Copyright 2025 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 <memory>
+#include <string>
+#include <utility>
+
+#include "absl/log/absl_check.h"
+#include "absl/status/statusor.h"
+#include "absl/strings/string_view.h"
+#include "checker/type_checker_builder.h"
+#include "common/decl.h"
+#include "common/type.h"
+#include "compiler/compiler.h"
+#include "compiler/compiler_factory.h"
+#include "compiler/standard_library.h"
+#include "internal/status_macros.h"
+#include "internal/testing_descriptor_pool.h"
+#include "runtime/runtime.h"
+#include "runtime/runtime_builder.h"
+#include "runtime/standard_runtime_builder_factory.h"
+#include "testing/testrunner/cel_expression_source.h"
+#include "testing/testrunner/cel_test_context.h"
+#include "testing/testrunner/cel_test_factories.h"
+#include "cel/expr/conformance/test/suite.pb.h"
+#include "google/protobuf/text_format.h"
+
+namespace cel::testing {
+
+using ::cel::test::CelTestContext;
+
+template <typename T>
+T ParseTextProtoOrDie(absl::string_view text_proto) {
+  T result;
+  ABSL_CHECK(google::protobuf::TextFormat::ParseFromString(text_proto, &result));
+  return result;
+}
+
+CEL_REGISTER_TEST_SUITE_FACTORY([]() {
+  return ParseTextProtoOrDie<cel::expr::conformance::test::TestSuite>(R"pb(
+    name: "raw_expression_tests"
+    description: "Tests for validating support for raw CEL expressions in test inputs and outputs."
+    sections: {
+      name: "raw_expression_io"
+      description: "A section for tests with raw CEL expressions in inputs and outputs."
+      tests: {
+        name: "eval_input_and_output"
+        description: "Test that a raw CEL expression can be provided as both an input and an expected output."
+        input: {
+          key: "x"
+          value { expr: "1 + 1" }
+        }
+        input: {
+          key: "y"
+          value { value { int64_value: 8 } }
+        }
+        output { result_expr: "5 * 2" }
+      }
+    }
+  )pb");
+});
+
+CEL_REGISTER_TEST_CONTEXT_FACTORY(
+    []() -> absl::StatusOr<std::unique_ptr<CelTestContext>> {
+      // Create a compiler.
+      CEL_ASSIGN_OR_RETURN(
+          std::unique_ptr<cel::CompilerBuilder> builder,
+          cel::NewCompilerBuilder(cel::internal::GetTestingDescriptorPool()));
+      CEL_RETURN_IF_ERROR(builder->AddLibrary(cel::StandardCompilerLibrary()));
+      cel::TypeCheckerBuilder& checker_builder = builder->GetCheckerBuilder();
+      CEL_RETURN_IF_ERROR(checker_builder.AddVariable(
+          cel::MakeVariableDecl("x", cel::IntType())));
+      CEL_RETURN_IF_ERROR(checker_builder.AddVariable(
+          cel::MakeVariableDecl("y", cel::IntType())));
+      CEL_ASSIGN_OR_RETURN(std::unique_ptr<cel::Compiler> compiler,
+                           builder->Build());
+
+      // Create a runtime.
+      CEL_ASSIGN_OR_RETURN(cel::RuntimeBuilder runtime_builder,
+                           cel::CreateStandardRuntimeBuilder(
+                               cel::internal::GetTestingDescriptorPool(), {}));
+      CEL_ASSIGN_OR_RETURN(std::unique_ptr<const cel::Runtime> runtime,
+                           std::move(runtime_builder).Build());
+
+      return CelTestContext::CreateFromRuntime(
+          std::move(runtime),
+          /*options=*/{
+              .expression_source =
+                  test::CelExpressionSource::FromRawExpression("x + y"),
+              .compiler = std::move(compiler)});
+    });
+}  // namespace cel::testing