build(rust): vendor googletest crate

third_party/crates/googletest-0.14.3/tests/no_std_test.rs

@@ -0,0 +1,37 @@
+// 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
+//
+//      http://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.
+
+#![no_std]
+
+/// A simple, no_std function.
+fn no_std_identity(value: u32) -> u32 {
+    value
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use googletest::prelude::*;
+
+    #[gtest]
+    fn no_std_verify() -> Result<()> {
+        verify_eq!(no_std_identity(42), 42)?;
+        Ok(())
+    }
+
+    #[gtest]
+    fn no_std_expect() {
+        expect_eq!(no_std_identity(214), 214)
+    }
+}