Add support for running tests on raw/checked expression.

PiperOrigin-RevId: 750851126

Author: CEL Dev Team

testing/src/test/resources/expressions/BUILD.bazel

@@ -0,0 +1,16 @@
+package(
+    default_applicable_licenses = [
+        "//:license",
+    ],
+    default_testonly = True,
+    default_visibility = [
+        "//testing:__pkg__",
+    ],
+)
+
+exports_files(
+    srcs = glob([
+        "**/*.cel",
+        "**/*.textproto",
+    ]),
+)

testing/src/test/resources/expressions/simple_test_case/simple_expression.cel

@@ -0,0 +1 @@
+2 + 2 == 4

testing/src/test/resources/expressions/simple_test_case/tests.textproto

@@ -0,0 +1,18 @@
+# proto-file: google3/third_party/cel/spec/proto/cel/expr/conformance/test/suite.proto
+# proto-message: cel.expr.conformance.test.TestSuite
+
+name: "expr_value_output_tests"
+description: "Value as expected output"
+sections {
+  name: "basic value"
+  description: "Basic value"
+  tests {
+    name: "basic value test"
+    description: "Basic value test"
+    output {
+      result_value {
+        bool_value: true
+      }
+    }
+  }
+}