add rust test for storage

src/tests/integration/data/soroban/contracts/test_storage/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "test_storage"
+version = "0.0.0"
+edition = "2021"
+publish = false
+
+[lib]
+crate-type = ["cdylib"]
+doctest = false
+
+[dependencies]
+soroban-sdk = { workspace = true }
+
+[dev-dependencies]
+soroban-sdk = { workspace = true, features = ["testutils"] }

src/tests/integration/data/soroban/contracts/test_storage/README.md

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+A quick example of a contract that can be ran with `ksoroban test`
+
+You will need to have the stellar cli utils installed:
+https://developers.stellar.org/docs/build/smart-contracts/getting-started/setup
+
+And the soroban semantics kompiled:
+```
+kdist build soroban-semantics.llvm
+```
+
+And then (from this directory):
+
+```sh
+soroban contract build --out-dir output
+ksoroban test output/test_storage.wasm
+```
+
+`ksoroban test` should exit successfully

src/tests/integration/data/soroban/contracts/test_storage/src/lib.rs

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+#![no_std]
+use soroban_sdk::{contract, contractimpl, Env, Symbol, symbol_short};
+
+#[contract]
+pub struct StorageContract;
+
+const INST_KEY: Symbol = symbol_short!("INST");
+const TEMP_KEY: Symbol = symbol_short!("TEMP");
+const PRST_KEY: Symbol = symbol_short!("PRST");
+
+#[contractimpl]
+impl StorageContract {
+    pub fn test_u32(env: Env, num1: u32, num2: u32, num3: u32) -> bool {
+        env.storage().instance().set(&INST_KEY, &num1);
+        env.storage().temporary().set(&TEMP_KEY, &num2);
+        env.storage().persistent().set(&PRST_KEY, &num3);
+
+        let snum1: u32 = env.storage().instance().get(&INST_KEY).unwrap();
+        let snum2: u32 = env.storage().temporary().get(&TEMP_KEY).unwrap();
+        let snum3: u32 = env.storage().persistent().get(&PRST_KEY).unwrap();
+
+        num1 == snum1 && num2 == snum2 && num3 == snum3
+    }
+
+    pub fn test_u32_overwrite(env: Env, num1: u32, num2: u32) -> bool {
+      env.storage().instance().set(&INST_KEY, &num1);
+      env.storage().instance().set(&INST_KEY, &num2);
+
+      let num: u32 = env.storage().instance().get(&INST_KEY).unwrap();
+
+      num == num2
+  }
+}