2 files changed, 23 insertions, 0 deletions
diff --git a/testing/web-platform/tests/encoding/streams/resources/readable-stream-from-array.js b/testing/web-platform/tests/encoding/streams/resources/readable-stream-from-array.js
new file mode 100644
index 0000000000..5c12ba8c8b
--- /dev/null
+++ b/testing/web-platform/tests/encoding/streams/resources/readable-stream-from-array.js
@@ -0,0 +1,12 @@
+'use strict';
+
+function readableStreamFromArray(array) {
+  return new ReadableStream({
+    start(controller) {
+      for (let entry of array) {
+        controller.enqueue(entry);
+      }
+      controller.close();
+   }
+  });
+}
diff --git a/testing/web-platform/tests/encoding/streams/resources/readable-stream-to-array.js b/testing/web-platform/tests/encoding/streams/resources/readable-stream-to-array.js
new file mode 100644
index 0000000000..fda03e2264
--- /dev/null
+++ b/testing/web-platform/tests/encoding/streams/resources/readable-stream-to-array.js
@@ -0,0 +1,11 @@
+'use strict';
+
+function readableStreamToArray(stream) {
+  var array = [];
+  var writable = new WritableStream({
+    write(chunk) {
+      array.push(chunk);
+    }
+  });
+  return stream.pipeTo(writable).then(() => array);
+}