test(iota-indexer): Add tests for GovernanceApi (#2825)

* refactor: Rebase Governance API tests

* feat: Implement simple test cases

* refactor: Fmt

* refactor: Assert system state summary; assert reference gas price

* refactor: Try add timelocked stakes to the cluster

* fix: add timelocked staking test

* fix: add timelocked unstaking test

* refactor: wait for transaction in timelocked tests

* refactor: fix clippy

* refactor: fix clippy

* refactor: fix clippy

* refactor: remove test that is not in feature base branch

* refactor: fix fmt

* refactor: fix fmt

* refactor: use dedicated keypair for timelocked staking tests

crates/iota-indexer/tests/common/mod.rs

@@ -127,6 +127,22 @@ pub async fn indexer_wait_for_checkpoint(
     .expect("Timeout waiting for indexer to catchup to checkpoint");
 }
 
+/// Wait for the indexer to catch up to the latest node checkpoint sequence
+/// number. Indexer starts storing data after checkpoint 0
+pub async fn indexer_wait_for_latest_checkpoint(
+    pg_store: &PgIndexerStore<PgConnection>,
+    cluster: &TestCluster,
+) {
+    let latest_checkpoint = cluster
+        .iota_client()
+        .read_api()
+        .get_latest_checkpoint_sequence_number()
+        .await
+        .unwrap();
+
+    indexer_wait_for_checkpoint(pg_store, latest_checkpoint).await;
+}
+
 /// Wait for the indexer to catch up to the given object sequence number
 pub async fn indexer_wait_for_object(
     client: &HttpClient,