test(soroban): add hello_world example for String and Vec<String> ABI coverage

Signed-off-by: sen <kawkoi@proton.me>

Author: sengmonkham

tests/soroban_testcases/hello_world.rs

@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: Apache-2.0
+
+use crate::build_solidity;
+use soroban_sdk::testutils::Logs;
+use soroban_sdk::{IntoVal, String, Vec};
+
+#[test]
+fn hello_world() {
+    let runtime = build_solidity(
+        r#"
+        contract HelloWorld {
+            function hello(string memory to) public pure returns (string[] memory) {
+                string[] memory res = new string[](2);
+                res[0] = "Hello";
+                res[1] = to;
+                return res;
+            }
+        }"#,
+        |_| {},
+    );
+
+    let addr = runtime.contracts.last().unwrap();
+
+    let to_str = String::from_str(&runtime.env, "Dev");
+    let res = runtime.invoke_contract(addr, "hello", vec![to_str.into_val(&runtime.env)]);
+
+    let vec_res: Vec<String> = res.into_val(&runtime.env);
+    println!("Logs: {:?}", runtime.env.logs().all());
+    assert_eq!(vec_res.len(), 2);
+
+    // Check elements
+    let _str0 = vec_res.get(0).unwrap();
+    let _str1 = vec_res.get(1).unwrap();
+}

tests/soroban_testcases/mod.rs

@@ -6,6 +6,7 @@ mod auth;
 mod constructor;
 mod cross_contract_calls;
 mod events;
+mod hello_world;
 mod i256_u256;
 mod integer_width_rounding;
 mod integer_width_warnings;