1 files changed, 79 insertions, 0 deletions
diff --git a/third_party/rust/serde_with/tests/utils.rs b/third_party/rust/serde_with/tests/utils.rs
new file mode 100644
index 0000000000..d9247ffff9
--- /dev/null
+++ b/third_party/rust/serde_with/tests/utils.rs
@@ -0,0 +1,79 @@
+#![allow(dead_code)]
+
+use core::fmt::Debug;
+use expect_test::Expect;
+use pretty_assertions::assert_eq;
+use serde::{de::DeserializeOwned, Serialize};
+
+#[track_caller]
+pub fn is_equal<T>(value: T, expected: Expect)
+where
+    T: Debug + DeserializeOwned + PartialEq + Serialize,
+{
+    let serialized = serde_json::to_string_pretty(&value).unwrap();
+    expected.assert_eq(&serialized);
+    assert_eq!(
+        value,
+        serde_json::from_str::<T>(&serialized).unwrap(),
+        "Deserialization differs from expected value."
+    );
+}
+
+/// Like [`is_equal`] but not pretty-print
+#[track_caller]
+pub fn is_equal_compact<T>(value: T, expected: Expect)
+where
+    T: Debug + DeserializeOwned + PartialEq + Serialize,
+{
+    let serialized = serde_json::to_string(&value).unwrap();
+    expected.assert_eq(&serialized);
+    assert_eq!(
+        value,
+        serde_json::from_str::<T>(&serialized).unwrap(),
+        "Deserialization differs from expected value."
+    );
+}
+
+#[track_caller]
+pub fn check_deserialization<T>(value: T, deserialize_from: &str)
+where
+    T: Debug + DeserializeOwned + PartialEq,
+{
+    assert_eq!(
+        value,
+        serde_json::from_str::<T>(deserialize_from).unwrap(),
+        "Deserialization differs from expected value."
+    );
+}
+
+#[track_caller]
+pub fn check_serialization<T>(value: T, serialize_to: Expect)
+where
+    T: Debug + Serialize,
+{
+    serialize_to.assert_eq(&serde_json::to_string_pretty(&value).unwrap());
+}
+
+#[track_caller]
+pub fn check_error_serialization<T>(value: T, error_msg: Expect)
+where
+    T: Debug + Serialize,
+{
+    error_msg.assert_eq(
+        &serde_json::to_string_pretty(&value)
+            .unwrap_err()
+            .to_string(),
+    );
+}
+
+#[track_caller]
+pub fn check_error_deserialization<T>(deserialize_from: &str, error_msg: Expect)
+where
+    T: Debug + DeserializeOwned,
+{
+    error_msg.assert_eq(
+        &serde_json::from_str::<T>(deserialize_from)
+            .unwrap_err()
+            .to_string(),
+    )
+}