Added Batched Overwrite delete test case

tests/basic.rs

@@ -763,5 +763,57 @@ async fn batched_overwrite() {
         );
     }
 
+    database.stop().await.unwrap();
+}
+
+#[async_test]
+async fn batched_overwrite_delete() {
+    const COUNT: u64 = 1000;
+
+    let (_tmpdir, database) = test_init().await;
+    let mut batch = WriteBatch::new();
+
+    for pos in 0..COUNT {
+        let key = format!("key_{pos}").into_bytes();
+        let value = format!("some_string_{pos}").into_bytes();
+
+        batch.put(key, value);
+    }
+
+    database.write(batch).await.unwrap();
+
+    //Perform overwrite and delete in the same batch
+    let mut batch_overwrite_delete = WriteBatch::new();
+
+    for pos in 0..COUNT {
+        let key = format!("key_{pos}").into_bytes();
+
+        // Delete every tenth key
+        if pos % 10 == 0 {
+            batch_overwrite_delete.delete(key.clone());
+        }
+        // Overwrite every other key
+        else {
+            let new_value = format!("some_other_string_{pos}").into_bytes();
+            batch_overwrite_delete.put(key.clone(), new_value);
+        }
+    }
+
+    database.write(batch_overwrite_delete).await.unwrap();
+
+    for pos in 0..COUNT {
+        let key = format!("key_{pos}").into_bytes();
+
+        if pos % 10 == 0 {
+            assert!(database.get(&key).await.unwrap().is_none());
+        } 
+        else {
+        let expected_value = format!("some_other_string_{pos}").into_bytes();
+        assert_eq!(
+            database.get(&key).await.unwrap().unwrap().get_value(),
+            expected_value
+        );
+        }
+    }
     database.stop().await.unwrap();
 }