Add a helper method for getting the latest batch

Signed-off-by: Martin Tzvetanov Grigorov <mgrigorov@apache.org>

crates/meilisearch/tests/batches/mod.rs

@@ -1309,7 +1309,7 @@ async fn test_summarized_dump_creation() {
     let server = Server::new_shared();
     let (task, _status_code) = server.create_dump().await;
     server.wait_task(task.uid()).await.succeeded();
-    let (batch, _) = server.get_batch(task.uid() as u32).await;
+    let (batch, _) = server.get_latest_batch().await;
     assert_json_snapshot!(batch,
         {
             ".uid" => "[uid]",

crates/meilisearch/tests/common/server.rs

@@ -429,6 +429,19 @@ impl<State> Server<State> {
         self.service.get(url).await
     }
 
+    // https://www.meilisearch.com/docs/reference/api/batches#get-batches states:
+    // "Batches are always returned in descending order of uid. This means that by default,
+    // the most recently created batch objects appear first."
+    pub async fn get_latest_batch(&self) -> (Option<Value>, StatusCode) {
+        let url = "/batches?limit=1&offset=0";
+        let (value, code) = self.service.get(url).await;
+        value
+            .get("results")
+            .and_then(|results| results.as_array())
+            .and_then(|array| array.first())
+            .map_or((None, code), |latest| (Some(Value(latest.clone())), code))
+    }
+
     pub async fn get_features(&self) -> (Value, StatusCode) {
         self.service.get("/experimental-features").await
     }