refactor(op_crates/web): move abort signal (#7117)

1 files changed, 75 insertions, 0 deletions

diff --git a/op_crates/web/abort_controller_test.js b/op_crates/web/abort_controller_test.js
new file mode 100644
index 000000000..a2fb12c65
--- /dev/null
+++ b/op_crates/web/abort_controller_test.js
@@ -0,0 +1,75 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+function assert(cond) {
+  if (!cond) {
+    throw Error("assert");
+  }
+}
+
+function assertEquals(left, right) {
+  assert(left === right);
+}
+
+function basicAbortController() {
+  controller = new AbortController();
+  assert(controller);
+  const { signal } = controller;
+  assert(signal);
+  assertEquals(signal.aborted, false);
+  controller.abort();
+  assertEquals(signal.aborted, true);
+}
+
+function signalCallsOnabort() {
+  const controller = new AbortController();
+  const { signal } = controller;
+  let called = false;
+  signal.onabort = (evt) => {
+    assert(evt);
+    assertEquals(evt.type, "abort");
+    called = true;
+  };
+  controller.abort();
+  assert(called);
+}
+
+function signalEventListener() {
+  const controller = new AbortController();
+  const { signal } = controller;
+  let called = false;
+  signal.addEventListener("abort", function (ev) {
+    assert(this === signal);
+    assertEquals(ev.type, "abort");
+    called = true;
+  });
+  controller.abort();
+  assert(called);
+}
+
+function onlyAbortsOnce() {
+  const controller = new AbortController();
+  const { signal } = controller;
+  let called = 0;
+  signal.addEventListener("abort", () => called++);
+  signal.onabort = () => {
+    called++;
+  };
+  controller.abort();
+  assertEquals(called, 2);
+  controller.abort();
+  assertEquals(called, 2);
+}
+
+function controllerHasProperToString() {
+  const actual = Object.prototype.toString.call(new AbortController());
+  assertEquals(actual, "[object AbortController]");
+}
+
+function main() {
+  basicAbortController();
+  signalCallsOnabort();
+  signalEventListener();
+  onlyAbortsOnce();
+  controllerHasProperToString();
+}
+
+main();