chore: checkpoint before Python removal

vendor/opaque-debug/tests/mod.rs

@@ -0,0 +1,55 @@
+#![allow(dead_code)]
+
+struct Foo {
+    secret: u64,
+}
+
+opaque_debug::implement!(Foo);
+
+struct FooGeneric<T> {
+    secret: u64,
+    generic: T,
+}
+
+opaque_debug::implement!(FooGeneric<T>);
+
+struct FooManyGenerics<T, U, V> {
+    secret: u64,
+    generic1: T,
+    generic2: U,
+    generic3: V,
+}
+
+opaque_debug::implement!(FooManyGenerics<T, U, V>);
+
+#[test]
+fn debug_formatting() {
+    let s = format!("{:?}", Foo { secret: 42 });
+    assert_eq!(s, "Foo { ... }");
+}
+
+#[test]
+fn debug_formatting_generic() {
+    let s = format!(
+        "{:?}",
+        FooGeneric::<()> {
+            secret: 42,
+            generic: ()
+        }
+    );
+    assert_eq!(s, "FooGeneric<()> { ... }");
+}
+
+#[test]
+fn debug_formatting_many_generics() {
+    let s = format!(
+        "{:?}",
+        FooManyGenerics::<(), u8, &str> {
+            secret: 42,
+            generic1: (),
+            generic2: 0u8,
+            generic3: "hello",
+        }
+    );
+    assert_eq!(s, "FooManyGenerics<(), u8, &str> { ... }");
+}