add goldie on storage layout

Cargo.toml

@@ -19,6 +19,7 @@ goldie = { version = "0.5.0", default-features = false }
 hex = { version = "0.4", default-features = false }
 paste = { version = "1.0", default-features = false }
 proc-macro2 = { version = "1.0", default-features = false }
+quote = { version = "1.0", default-features = false }
 rand = { version = "0.8.5", default-features = false }
 soroban-sdk = { version = "22.0.6" }
 soroban-token-sdk = { version = "22.0.6" }
@@ -31,6 +32,7 @@ stellar-example = { version = "^1.0.0", path = "contracts/stellar-example" }
 stellar-interchain-token = { version = "^1.0.0", path = "contracts/stellar-interchain-token" }
 stellar-interchain-token-service = { version = "^1.0.0", path = "contracts/stellar-interchain-token-service" }
 stellar-token-manager = { version = "^1.0.0", path = "contracts/stellar-token-manager" }
+syn = { version = "2.0", features = ["full", "extra-traits"] }
 
 [workspace.lints.clippy]
 nursery = { level = "warn", priority = -1 }

packages/stellar-axelar-std-derive/Cargo.toml

@@ -14,8 +14,8 @@ proc-macro = true
 [dependencies]
 heck = "0.5"
 proc-macro2 = { workspace = true }
-quote = "1.0"
-syn = { version = "2.0", features = ["full"] }
+quote = { workspace = true }
+syn = { workspace = true }
 
 [dev-dependencies]
 

packages/stellar-axelar-std/Cargo.toml

@@ -19,8 +19,11 @@ stellar-axelar-std-derive = { workspace = true, optional = true }
 goldie = { workspace = true }
 hex = { workspace = true }
 paste = { workspace = true }
+prettyplease = "0.2"
+quote = { workspace = true }
 soroban-sdk = { workspace = true, features = ["testutils"] }
 stellar-axelar-std-derive = { workspace = true }
+syn = { workspace = true }
 
 [features]
 testutils = ["soroban-sdk/testutils", "dep:hex"]

packages/stellar-axelar-std/src/tests/storage.rs

@@ -3,12 +3,17 @@ use soroban_sdk::{contract, contractimpl, contracttype, Address, Env, String};
 
 use crate as stellar_axelar_std;
 use crate::contractstorage;
+use crate::std::string::ToString;
 
 #[contract]
 pub struct Contract;
 
 mod storage {
     use super::*;
+    use prettyplease;
+    use quote::quote;
+    use std::vec;
+    use syn::parse_quote;
 
     #[contractstorage]
     enum DataKey {
@@ -28,6 +33,39 @@ mod storage {
         #[value(bool)]
         Flag { key: String, owner: Address },
     }
+
+    #[test]
+    fn test_storage_schema_stability() {
+        let expected = quote! {
+            enum DataKey {
+                #[instance]
+                #[value(u32)]
+                Counter,
+
+                #[persistent]
+                #[value(String)]
+                Message { sender: Address },
+
+                #[temporary]
+                #[value(Address)]
+                LastCaller { timestamp: u64 },
+
+                #[persistent]
+                #[value(bool)]
+                Flag { key: String, owner: Address },
+            }
+        };
+
+        let syntax: syn::Item = parse_quote! { #expected };
+
+        let formatted_expected = prettyplease::unparse(&syn::File {
+            shebang: None,
+            attrs: vec![],
+            items: vec![syntax],
+        });
+
+        goldie::assert!(formatted_expected.to_string());
+    }
 }
 
 #[contractimpl]

packages/stellar-axelar-std/src/tests/testdata/test_storage_schema_stability.golden

@@ -0,0 +1,14 @@
+enum DataKey {
+    #[instance]
+    #[value(u32)]
+    Counter,
+    #[persistent]
+    #[value(String)]
+    Message { sender: Address },
+    #[temporary]
+    #[value(Address)]
+    LastCaller { timestamp: u64 },
+    #[persistent]
+    #[value(bool)]
+    Flag { key: String, owner: Address },
+}