Implement author-constructible ReadableStream using V8 extras

third_party/WebKit/LayoutTests/http/tests/streams/readable-streams/count-queuing-strategy-integration.js

Index: third_party/WebKit/LayoutTests/http/tests/streams/readable-streams/count-queuing-strategy-integration.js
diff --git a/third_party/WebKit/LayoutTests/http/tests/streams/readable-streams/count-queuing-strategy-integration.js b/third_party/WebKit/LayoutTests/http/tests/streams/readable-streams/count-queuing-strategy-integration.js
new file mode 100644
index 0000000000000000000000000000000000000000..fb9a1aa2ba631edbb9de183f1066e63a39277fcd
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/http/tests/streams/readable-streams/count-queuing-strategy-integration.js
@@ -0,0 +1,213 @@
+'use strict';
+
+if (self.importScripts) {
+  self.importScripts('/resources/testharness.js');
+}
+
+test(() => {
+
+  new ReadableStream({}, new CountQueuingStrategy({ highWaterMark: 4 }));
+
+}, 'Can construct a readable stream with a valid CountQueuingStrategy');
+
+promise_test(() => {
+
+  let controller;
+  const rs = new ReadableStream(
+    {
+      start(c) {
+        controller = c;
+      }
+    },
+    new CountQueuingStrategy({ highWaterMark: 0 })
+  );
+  const reader = rs.getReader();
+
+  assert_equals(controller.desiredSize, 0, '0 reads, 0 enqueues: desiredSize should be 0');
+  controller.enqueue('a');
+  assert_equals(controller.desiredSize, -1, '0 reads, 1 enqueue: desiredSize should be -1');
+  controller.enqueue('b');
+  assert_equals(controller.desiredSize, -2, '0 reads, 2 enqueues: desiredSize should be -2');
+  controller.enqueue('c');
+  assert_equals(controller.desiredSize, -3, '0 reads, 3 enqueues: desiredSize should be -3');
+  controller.enqueue('d');
+  assert_equals(controller.desiredSize, -4, '0 reads, 4 enqueues: desiredSize should be -4');
+
+  return reader.read()
+    .then(result => {
+      assert_object_equals(result, { value: 'a', done: false },
+                           '1st read gives back the 1st chunk enqueued (queue now contains 3 chunks)');
+      return reader.read();
+    })
+    .then(result => {
+      assert_object_equals(result, { value: 'b', done: false },
+                           '2nd read gives back the 2nd chunk enqueued (queue now contains 2 chunks)');
+      return reader.read();
+    })
+    .then(result => {
+      assert_object_equals(result, { value: 'c', done: false },
+                           '3rd read gives back the 3rd chunk enqueued (queue now contains 1 chunk)');
+
+      assert_equals(controller.desiredSize, -1, '3 reads, 4 enqueues: desiredSize should be -1');
+      controller.enqueue('e');
+      assert_equals(controller.desiredSize, -2, '3 reads, 5 enqueues: desiredSize should be -2');
+
+      return reader.read();
+    })
+    .then(result => {
+      assert_object_equals(result, { value: 'd', done: false },
+                           '4th read gives back the 4th chunk enqueued (queue now contains 1 chunks)');
+      return reader.read();
+
+    }).then(result => {
+      assert_object_equals(result, { value: 'e', done: false },
+                           '5th read gives back the 5th chunk enqueued (queue now contains 0 chunks)');
+
+      assert_equals(controller.desiredSize, 0, '5 reads, 5 enqueues: desiredSize should be 0');
+      controller.enqueue('f');
+      assert_equals(controller.desiredSize, -1, '5 reads, 6 enqueues: desiredSize should be -1');
+      controller.enqueue('g');
+      assert_equals(controller.desiredSize, -2, '5 reads, 7 enqueues: desiredSize should be -2');
+    });
+
+}, 'Correctly governs a ReadableStreamController\'s desiredSize property (HWM = 0)');
+
+promise_test(() => {
+
+  let controller;
+  const rs = new ReadableStream(
+    {
+      start(c) {
+        controller = c;
+      }
+    },
+    new CountQueuingStrategy({ highWaterMark: 1 })
+  );
+  const reader = rs.getReader();
+
+  assert_equals(controller.desiredSize, 1, '0 reads, 0 enqueues: desiredSize should be 1');
+  controller.enqueue('a');
+  assert_equals(controller.desiredSize, 0, '0 reads, 1 enqueue: desiredSize should be 0');
+  controller.enqueue('b');
+  assert_equals(controller.desiredSize, -1, '0 reads, 2 enqueues: desiredSize should be -1');
+  controller.enqueue('c');
+  assert_equals(controller.desiredSize, -2, '0 reads, 3 enqueues: desiredSize should be -2');
+  controller.enqueue('d');
+  assert_equals(controller.desiredSize, -3, '0 reads, 4 enqueues: desiredSize should be -3');
+
+  return reader.read()
+    .then(result => {
+      assert_object_equals(result, { value: 'a', done: false },
+                           '1st read gives back the 1st chunk enqueued (queue now contains 3 chunks)');
+      return reader.read();
+    })
+    .then(result => {
+      assert_object_equals(result, { value: 'b', done: false },
+                           '2nd read gives back the 2nd chunk enqueued (queue now contains 2 chunks)');
+      return reader.read();
+    })
+    .then(result => {
+      assert_object_equals(result, { value: 'c', done: false },
+                           '3rd read gives back the 3rd chunk enqueued (queue now contains 1 chunk)');
+
+      assert_equals(controller.desiredSize, 0, '3 reads, 4 enqueues: desiredSize should be 0');
+      controller.enqueue('e');
+      assert_equals(controller.desiredSize, -1, '3 reads, 5 enqueues: desiredSize should be -1');
+
+      return reader.read();
+    })
+    .then(result => {
+      assert_object_equals(result, { value: 'd', done: false },
+                           '4th read gives back the 4th chunk enqueued (queue now contains 1 chunks)');
+      return reader.read();
+    })
+    .then(result => {
+      assert_object_equals(result, { value: 'e', done: false },
+                           '5th read gives back the 5th chunk enqueued (queue now contains 0 chunks)');
+
+      assert_equals(controller.desiredSize, 1, '5 reads, 5 enqueues: desiredSize should be 1');
+      controller.enqueue('f');
+      assert_equals(controller.desiredSize, 0, '5 reads, 6 enqueues: desiredSize should be 0');
+      controller.enqueue('g');
+      assert_equals(controller.desiredSize, -1, '5 reads, 7 enqueues: desiredSize should be -1');
+    });
+
+}, 'Correctly governs a ReadableStreamController\'s desiredSize property (HWM = 1)');
+
+promise_test(() => {
+
+  let controller;
+  const rs = new ReadableStream(
+    {
+      start(c) {
+        controller = c;
+      }
+    },
+    new CountQueuingStrategy({ highWaterMark: 4 })
+  );
+  const reader = rs.getReader();
+
+  assert_equals(controller.desiredSize, 4, '0 reads, 0 enqueues: desiredSize should be 4');
+  controller.enqueue('a');
+  assert_equals(controller.desiredSize, 3, '0 reads, 1 enqueue: desiredSize should be 3');
+  controller.enqueue('b');
+  assert_equals(controller.desiredSize, 2, '0 reads, 2 enqueues: desiredSize should be 2');
+  controller.enqueue('c');
+  assert_equals(controller.desiredSize, 1, '0 reads, 3 enqueues: desiredSize should be 1');
+  controller.enqueue('d');
+  assert_equals(controller.desiredSize, 0, '0 reads, 4 enqueues: desiredSize should be 0');
+  controller.enqueue('e');
+  assert_equals(controller.desiredSize, -1, '0 reads, 5 enqueues: desiredSize should be -1');
+  controller.enqueue('f');
+  assert_equals(controller.desiredSize, -2, '0 reads, 6 enqueues: desiredSize should be -2');
+
+
+  reader.read()
+    .then(result => {
+      assert_object_equals(result, { value: 'a', done: false },
+                           '1st read gives back the 1st chunk enqueued (queue now contains 5 chunks)');
+      return reader.read();
+    })
+    .then(result => {
+      assert_object_equals(result, { value: 'b', done: false },
+                           '2nd read gives back the 2nd chunk enqueued (queue now contains 4 chunks)');
+
+      assert_equals(controller.desiredSize, 0, '2 reads, 6 enqueues: desiredSize should be 0');
+      controller.enqueue('g');
+      assert_equals(controller.desiredSize, -1, '2 reads, 7 enqueues: desiredSize should be -1');
+
+      return reader.read();
+    })
+    .then(result => {
+      assert_object_equals(result, { value: 'c', done: false },
+                           '3rd read gives back the 3rd chunk enqueued (queue now contains 4 chunks)');
+      return reader.read();
+    })
+    .then(result => {
+      assert_object_equals(result, { value: 'd', done: false },
+                           '4th read gives back the 4th chunk enqueued (queue now contains 3 chunks)');
+      return reader.read();
+    })
+    .then(result => {
+      assert_object_equals(result, { value: 'e', done: false },
+                           '5th read gives back the 5th chunk enqueued (queue now contains 2 chunks)');
+      return reader.read();
+    })
+    .then(result => {
+      assert_object_equals(result, { value: 'f', done: false },
+                           '6th read gives back the 6th chunk enqueued (queue now contains 0 chunks)');
+
+      assert_equals(controller.desiredSize, 3, '6 reads, 7 enqueues: desiredSize should be 3');
+      controller.enqueue('h');
+      assert_equals(controller.desiredSize, 2, '6 reads, 8 enqueues: desiredSize should be 2');
+      controller.enqueue('i');
+      assert_equals(controller.desiredSize, 1, '6 reads, 9 enqueues: desiredSize should be 1');
+      controller.enqueue('j');
+      assert_equals(controller.desiredSize, 0, '6 reads, 10 enqueues: desiredSize should be 0');
+      controller.enqueue('k');
+      assert_equals(controller.desiredSize, -1, '6 reads, 11 enqueues: desiredSize should be -1');
+    });
+
+}, 'Correctly governs a ReadableStreamController\'s desiredSize property (HWM = 4)');
+
+done();