test: implement test helpers and initialization tests (#607)

contracts/workspace_booking/src/test.rs

@@ -0,0 +1,64 @@
+// contracts/workspace_booking/src/test.rs
+#![cfg(test)]
+
+use super::*;
+use soroban_sdk::{
+    testutils::{Address as _, Ledger},
+    token::{Client as TokenClient, StellarAssetClient},
+    Address, Env, String,
+};
+
+// ── Helpers ───────────────────────────────────────────────────────────────────
+
+/// Register the workspace_booking contract and return its address.
+fn setup_contract(env: &Env) -> Address {
+    env.register(WorkspaceBookingContract, ())
+}
+
+/// Register a mock token (Stellar Asset Contract), mint `amount` to `recipient`,
+/// and return the token address.
+fn setup_token(env: &Env, admin: &Address, recipient: &Address, amount: i128) -> Address {
+    let token_address = env.register_stellar_asset_contract_v2(admin.clone()).address();
+    StellarAssetClient::new(env, &token_address)
+        .mock_all_auths()
+        .mint(recipient, &amount);
+    token_address
+}
+
+/// Advance the ledger timestamp by `seconds`.
+fn advance_time(env: &Env, seconds: u64) {
+    env.ledger().with_mut(|l| l.timestamp += seconds);
+}
+
+// ── Tests ─────────────────────────────────────────────────────────────────────
+
+#[test]
+fn test_initialize_success() {
+    let env = Env::default();
+    let contract_id = setup_contract(&env);
+    let client = WorkspaceBookingContractClient::new(&env, &contract_id);
+
+    let admin = Address::generate(&env);
+    let token = Address::generate(&env);
+
+    env.mock_all_auths();
+    client.initialize(&admin, &token);
+
+    assert_eq!(client.admin(), admin);
+    assert_eq!(client.payment_token(), token);
+}
+
+#[test]
+#[should_panic(expected = "Error(Contract, #3)")]
+fn test_initialize_twice_fails() {
+    let env = Env::default();
+    let contract_id = setup_contract(&env);
+    let client = WorkspaceBookingContractClient::new(&env, &contract_id);
+
+    let admin = Address::generate(&env);
+    let token = Address::generate(&env);
+
+    env.mock_all_auths();
+    client.initialize(&admin, &token);
+    client.initialize(&admin, &token); // AlreadyInitialized = 3
+}