Import wpt@503f5b5f78ec4e87d144f78609f363f0ed0ea8db

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

Index: third_party/WebKit/LayoutTests/external/wpt/streams/readable-streams/general.js
diff --git a/third_party/WebKit/LayoutTests/external/wpt/streams/readable-streams/general.js b/third_party/WebKit/LayoutTests/external/wpt/streams/readable-streams/general.js
index a8924be0532e3e549bdca40fa6e9a1a476b5340c..edb49f4263e1b1686332365c3720e20cd9b517ee 100644
--- a/third_party/WebKit/LayoutTests/external/wpt/streams/readable-streams/general.js
+++ b/third_party/WebKit/LayoutTests/external/wpt/streams/readable-streams/general.js
@@ -733,6 +733,30 @@ promise_test(() => {
 }, 'ReadableStream: should call underlying source methods as methods');
 
 test(() => {
+  const rs = new ReadableStream({
+    start(c) {
+      assert_equals(c.desiredSize, 10, 'desiredSize must start at highWaterMark');
+      c.close();
+      assert_equals(c.desiredSize, 0, 'after closing, desiredSize must be 0');
+    }
+  }, {
+    highWaterMark: 10
+  });
+}, 'ReadableStream: desiredSize when closed');
+
+test(() => {
+  const rs = new ReadableStream({
+    start(c) {
+      assert_equals(c.desiredSize, 10, 'desiredSize must start at highWaterMark');
+      c.error();
+      assert_equals(c.desiredSize, null, 'after erroring, desiredSize must be null');
+    }
+  }, {
+    highWaterMark: 10
+  });
+}, 'ReadableStream: desiredSize when errored');
+
+test(() => {
 
   let startCalled = false;
   new ReadableStream({