async_db: add [bufread, bufread_stream] tests

lib/src/async_db.rs

@@ -715,4 +715,73 @@ mod test {
             });
         }
     }
+
+    #[tokio::test]
+    async fn test_write_bufread() {
+        let dir = tempdir().expect("tempdir");
+        let tmpfile = dir.path().join("test.tmp");
+        let opts = WriterOpts {
+            data_buf_size: 10 * 1024 * 1024,
+            out_buf_size: 10 * 1024 * 1024,
+            ..Default::default()
+        };
+        let mut writer: Writer<TestData> = Writer::new(&tmpfile, opts).await.expect("new writer");
+
+        let items_iter = gen_data(5);
+        let items: Vec<TestData> = items_iter.collect();
+
+        let src = futures::stream::iter(items.clone());
+        pin_mut!(src);
+        writer.load(src).await.expect("load");
+        writer.finish().await.expect("finish write");
+
+        let mut reader = BufReader::<TestData>::new(&tmpfile, 4096)
+            .await
+            .expect("new buf reader");
+        assert_eq!(items.len(), reader.len());
+
+        for (idx, item) in items.iter().enumerate() {
+            let ritem = reader.get(idx).await.expect("get");
+            assert_eq!(*item, ritem);
+        }
+    }
+
+    #[tokio::test]
+    async fn test_write_bufread_stream() {
+        let dir = tempdir().expect("tempdir");
+        let tmpfile = dir.path().join("test.tmp");
+        let opts = WriterOpts {
+            data_buf_size: 10 * 1024 * 1024,
+            out_buf_size: 10 * 1024 * 1024,
+            ..Default::default()
+        };
+        let mut writer: Writer<TestData> = Writer::new(&tmpfile, opts).await.expect("new writer");
+
+        let items_iter = gen_data(5);
+        let items: Vec<TestData> = items_iter.collect();
+
+        let src = futures::stream::iter(items.clone());
+        pin_mut!(src);
+        writer.load(src).await.expect("load");
+        writer.finish().await.expect("finish write");
+
+        let reader = BufReader::<TestData>::new(&tmpfile, 4096)
+            .await
+            .expect("new buf reader");
+        assert_eq!(items.len(), reader.len());
+
+        let dst_stream = reader.stream();
+        let src_stream = futures::stream::iter(items.iter());
+
+        let mut count = 0;
+        src_stream
+            .zip(dst_stream)
+            .map(|x| {
+                count += 1;
+                x
+            })
+            .for_each(assert_data_eq)
+            .await;
+        assert_eq!(count, items.len())
+    }
 }