add batch call test example

tests/src/frame/system.rs

@@ -15,16 +15,13 @@
 // along with substrate-subxt.  If not, see <http://www.gnu.org/licenses/>.
 
 use crate::{
-    node_runtime::system,
-    test_context,
-    TestRuntime,
+    node_runtime::runtime_types::frame_system::pallet::Call,
+    node_runtime::runtime_types::node_runtime::Call::System, node_runtime::system,
+    node_runtime::utility, test_context, TestRuntime,
 };
 use assert_matches::assert_matches;
 use sp_keyring::AccountKeyring;
-use subxt::extrinsic::{
-    PairSigner,
-    Signer,
-};
+use subxt::extrinsic::{PairSigner, Signer};
 
 #[async_std::test]
 async fn storage_account() {
@@ -57,3 +54,32 @@ async fn tx_remark_with_event() {
     let remarked = result.find_event::<system::events::Remarked>();
     assert_matches!(remarked, Ok(Some(_)));
 }
+
+#[async_std::test]
+async fn tx_batch_remarks() {
+    let alice = PairSigner::<TestRuntime, _>::new(AccountKeyring::Alice.pair());
+    let cxt = test_context().await;
+
+    let remark_a = Call::remark {
+        remark: b"cool remark".to_vec(),
+    };
+    let remark_b = Call::remark {
+        remark: b"awesome remark".to_vec(),
+    };
+
+    let call_a = System(remark_a);
+
+    let call_b = System(remark_b);
+
+    let result = cxt
+        .api
+        .tx()
+        .utility()
+        .batch(vec![call_a, call_b])
+        .sign_and_submit_then_watch(&alice)
+        .await
+        .unwrap();
+
+    let batch_completed = result.find_event::<utility::events::BatchCompleted>();
+    assert_matches!(batch_completed, Ok(Some(_)));
+}