added benchmarks (#142)

tests/test_object_copy.rs

@@ -0,0 +1,55 @@
+// MinIO Rust Library for Amazon S3 Compatible Cloud Storage
+// Copyright 2025 MinIO, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use minio::s3::args::{CopyObjectArgs, CopySource, StatObjectArgs};
+use minio::s3::builders::ObjectContent;
+use minio_common::rand_src::RandSrc;
+use minio_common::test_context::TestContext;
+use minio_common::utils::rand_object_name;
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 10)]
+async fn copy_object() {
+    let ctx = TestContext::new_from_env();
+    let (bucket_name, _cleanup) = ctx.create_bucket_helper().await;
+    let src_object_name = rand_object_name();
+
+    let n_bytes = 16_u64;
+    let content = ObjectContent::new_from_stream(RandSrc::new(n_bytes), Some(n_bytes));
+    ctx.client
+        .put_object_content(&bucket_name, &src_object_name, content)
+        .send()
+        .await
+        .unwrap();
+
+    let object_name = rand_object_name();
+    ctx.client
+        .copy_object(
+            &CopyObjectArgs::new(
+                &bucket_name,
+                &object_name,
+                CopySource::new(&bucket_name, &src_object_name).unwrap(),
+            )
+            .unwrap(),
+        )
+        .await
+        .unwrap();
+
+    let resp = ctx
+        .client
+        .stat_object(&StatObjectArgs::new(&bucket_name, &object_name).unwrap())
+        .await
+        .unwrap();
+    assert_eq!(resp.size as u64, n_bytes);
+}