Import wpt@503f5b5f78ec4e87d144f78609f363f0ed0ea8db

third_party/WebKit/LayoutTests/external/wpt/streams/readable-byte-streams/general.js

Index: third_party/WebKit/LayoutTests/external/wpt/streams/readable-byte-streams/general.js
diff --git a/third_party/WebKit/LayoutTests/external/wpt/streams/readable-byte-streams/general.js b/third_party/WebKit/LayoutTests/external/wpt/streams/readable-byte-streams/general.js
index d9cc7fc88433d243b75192b7a8df98b68eb0cd4d..ef74ae1bdfdad2e05514b490ca90b8f8978625c6 100644
--- a/third_party/WebKit/LayoutTests/external/wpt/streams/readable-byte-streams/general.js
+++ b/third_party/WebKit/LayoutTests/external/wpt/streams/readable-byte-streams/general.js
@@ -100,6 +100,32 @@ promise_test(t => {
   return Promise.resolve();
 }, 'ReadableStream with byte source: Construct with highWaterMark of 0');
 
+test(() => {
+  const rs = new ReadableStream({
+    start(c) {
+      assert_equals(c.desiredSize, 10, 'desiredSize must start at the highWaterMark');
+      c.close();
+      assert_equals(c.desiredSize, 0, 'after closing, desiredSize must be 0');
+    },
+    type: 'bytes'
+  }, {
+    highWaterMark: 10
+  });
+}, 'ReadableStream with byte source: desiredSize when closed');
+
+test(() => {
+  const rs = new ReadableStream({
+    start(c) {
+      assert_equals(c.desiredSize, 10, 'desiredSize must start at the highWaterMark');
+      c.error();
+      assert_equals(c.desiredSize, null, 'after erroring, desiredSize must be null');
+    },
+    type: 'bytes'
+  }, {
+    highWaterMark: 10
+  });
+}, 'ReadableStream with byte source: desiredSize when errored');
+
 promise_test(t => {
   const stream = new ReadableStream({
     type: 'bytes'