Add conformance testing to string.format implementation

build.gradle.kts

@@ -90,8 +90,66 @@ tasks.register<Exec>("generateTestSourcesNoImports") {
     commandLine(buf.asPath, "generate", "--template", "src/test/resources/proto/buf.gen.noimports.yaml")
 }
 
+tasks.register<Exec>("generateCelConformance") {
+    dependsOn("generateCelConformanceTestTypes")
+    description = "Generates CEL conformance code with buf generate for unit tests."
+    commandLine(
+        buf.asPath,
+        "generate",
+        "--template",
+        "src/test/resources/proto/buf.gen.cel.yaml",
+        "buf.build/google/cel-spec:${project.findProperty("cel.spec.version")}",
+        "--exclude-path",
+        "cel/expr/conformance/proto2",
+        "--exclude-path",
+        "cel/expr/conformance/proto3",
+    )
+}
+
+// The conformance tests use the Protobuf package path for tests that use these types.
+// i.e. cel.expr.conformance.proto3.TestAllTypes. But, if we use managed mode it adds 'com'
+// to the prefix. Additionally, we can't disable managed mode because the java_package option
+// specified in these proto files is "dev.cel.expr.conformance.proto3". So, to get around this,
+// we're generating these separately and specifying a java_package override of the package we need.
+tasks.register<Exec>("generateCelConformanceTestTypes") {
+    dependsOn("exportProtovalidateModule")
+    description = "Generates CEL conformance test types with buf generate for unit tests using a Java package override."
+    commandLine(
+        buf.asPath,
+        "generate",
+        "--template",
+        "src/test/resources/proto/buf.gen.cel.testtypes.yaml",
+        "buf.build/google/cel-spec:${project.findProperty("cel.spec.version")}",
+        "--path",
+        "cel/expr/conformance/proto3",
+    )
+}
+
+var getCelTestData =
+    tasks.register<Exec>("getCelTestData") {
+        val celVersion = project.findProperty("cel.spec.version")
+        val fileUrl = "https://raw.githubusercontent.com/google/cel-spec/refs/tags/$celVersion/tests/simple/testdata/string_ext.textproto"
+        val targetDir = File("${project.projectDir}/src/test/resources/testdata")
+        val file = File(targetDir, "string_ext_$celVersion.textproto")
+
+        onlyIf {
+            // Only run curl if file doesn't exist
+            !file.exists()
+        }
+        doFirst {
+            file.parentFile.mkdirs()
+            commandLine(
+                "curl",
+                "-fsSL",
+                "-o",
+                file.absolutePath,
+                fileUrl,
+            )
+        }
+    }
+
 tasks.register("generateTestSources") {
-    dependsOn("generateTestSourcesImports", "generateTestSourcesNoImports")
+    dependsOn("generateTestSourcesImports", "generateTestSourcesNoImports", "generateCelConformance")
     description = "Generates code with buf generate for unit tests"
 }
 
@@ -206,6 +264,7 @@ allprojects {
         }
     }
     tasks.withType<Test>().configureEach {
+        dependsOn(getCelTestData)
         useJUnitPlatform()
         this.testLogging {
             events("failed")

gradle.properties

@@ -6,3 +6,6 @@ protovalidate.conformance.args = --strict_message --strict_error --expected_fail
 
 # Argument to the license-header CLI
 license-header.years = 2023-2024
+
+# Version of the cel-spec that this implementation is conformant with
+cel.spec.version = v0.24.0