Add helper to turn deno.Reader into async iterator (#1130)

1 files changed, 12 insertions, 0 deletions

diff --git a/js/files_test.ts b/js/files_test.ts
index 9759e0b26..37f63d9fa 100644
--- a/js/files_test.ts
+++ b/js/files_test.ts
@@ -17,3 +17,15 @@ test(async function filesCopyToStdout() {
   assertEqual(bytesWritten, fileSize);
   console.log("bytes written", bytesWritten);
 });
+
+test(async function filesToAsyncIterator() {
+  const filename = "tests/hello.txt";
+  const file = await deno.open(filename);
+
+  let totalSize = 0;
+  for await (const buf of deno.toAsyncIterator(file)) {
+    totalSize += buf.byteLength;
+  }
+
+  assertEqual(totalSize, 12);
+});