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denoland-deno/cli/tests/unit/abort_controller_test.ts

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import { unitTest, assert, assertEquals } from "./test_util.ts";
unitTest(function basicAbortController() {
const controller = new AbortController();
assert(controller);
const { signal } = controller;
assert(signal);
assertEquals(signal.aborted, false);
controller.abort();
assertEquals(signal.aborted, true);
});
unitTest(function signalCallsOnabort() {
const controller = new AbortController();
const { signal } = controller;
let called = false;
signal.onabort = (evt): void => {
assert(evt);
assertEquals(evt.type, "abort");
called = true;
};
controller.abort();
assert(called);
});
unitTest(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);
});
unitTest(function onlyAbortsOnce() {
const controller = new AbortController();
const { signal } = controller;
let called = 0;
signal.addEventListener("abort", () => called++);
signal.onabort = (): void => {
called++;
};
controller.abort();
assertEquals(called, 2);
controller.abort();
assertEquals(called, 2);
});
unitTest(function controllerHasProperToString() {
const actual = Object.prototype.toString.call(new AbortController());
assertEquals(actual, "[object AbortController]");
});