build(rust): vendor googletest crate

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

@@ -0,0 +1,58 @@
+// Copyright 2024 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.
+
+mod write_expr_value {
+    use googletest::prelude::*;
+
+    // Converts the formatting call to a `String` for testing.
+    macro_rules! write_expr_value {
+        ($expr_str:expr, $expr: expr $(,)?) => {{
+            let mut s = String::new();
+            ::googletest::fmt::internal::__googletest__write_expr_value!(s, $expr_str, $expr);
+            s
+        }};
+    }
+
+    #[test]
+    fn test_with_debug_value_references() -> googletest::Result<()> {
+        #[derive(Debug)]
+        struct Foo;
+        let mut val = Foo;
+
+        verify_that!(write_expr_value!("val", val), eq("\n  val = Foo,"))?;
+        verify_that!(write_expr_value!("val", &val), eq("\n  val = Foo,"))?;
+        verify_that!(write_expr_value!("val", &&val), eq("\n  val = Foo,"))?;
+        verify_that!(write_expr_value!("val", &mut val), eq("\n  val = Foo,"))?;
+        verify_that!(write_expr_value!("val", &mut &mut val), eq("\n  val = Foo,"))?;
+
+        Ok(())
+    }
+
+    #[test]
+    fn test_with_non_debug_value_references() -> googletest::Result<()> {
+        struct Foo;
+        let mut val = Foo;
+
+        verify_that!(write_expr_value!("val", val), eq("\n  val does not implement Debug,"))?;
+        verify_that!(write_expr_value!("val", &val), eq("\n  val does not implement Debug,"))?;
+        verify_that!(write_expr_value!("val", &&val), eq("\n  val does not implement Debug,"))?;
+        verify_that!(write_expr_value!("val", &mut val), eq("\n  val does not implement Debug,"))?;
+        verify_that!(
+            write_expr_value!("val", &mut &mut val),
+            eq("\n  val does not implement Debug,")
+        )?;
+
+        Ok(())
+    }
+}