87 lines
2.8 KiB
JavaScript
87 lines
2.8 KiB
JavaScript
promise_test(async () => {
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const results = [];
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const source = new Observable(subscriber => {
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subscriber.addTeardown(() => results.push('teardown'));
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subscriber.next(1);
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results.push(subscriber.active ? 'active' : 'inactive');
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results.push(subscriber.signal.aborted ? 'aborted' : 'not aborted')
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// Ignored.
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subscriber.next(2);
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subscriber.complete();
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});
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const value = await source.first();
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assert_array_equals(results, ['teardown', 'inactive', 'aborted']);
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assert_equals(value, 1,
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"Promise resolves with the first value from the source Observable");
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}, "first(): Promise resolves with the first value from the source Observable");
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promise_test(async (t) => {
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const error = new Error("error from source");
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const source = new Observable(subscriber => {
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subscriber.error(error);
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});
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return promise_rejects_exactly(t, error, source.first(), "Promise rejects with source Observable error");
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}, "first(): Promise rejects with the error emitted from the source Observable");
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promise_test(async (t) => {
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const source = new Observable(subscriber => {
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subscriber.complete();
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});
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return promise_rejects_js(t, RangeError, source.first(), "Upon complete(), first() Promise rejects with RangeError");
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}, "first(): Promise rejects with RangeError when source Observable " +
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"completes without emitting any values");
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promise_test(async (t) => {
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const source = new Observable(subscriber => {});
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const controller = new AbortController();
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const promise = source.first({ signal: controller.signal });
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controller.abort();
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return promise_rejects_dom(t, "AbortError", promise, "Promise rejects with a DOMException for abortion");
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}, "first(): Aborting a signal rejects the Promise with an AbortError DOMException");
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promise_test(async () => {
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const results = [];
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const source = new Observable(subscriber => {
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results.push("source subscribe");
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subscriber.addTeardown(() => results.push("source teardown"));
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subscriber.signal.addEventListener("abort", () => results.push("source abort"));
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results.push("before source next 1");
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subscriber.next(1);
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results.push("after source next 1");
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});
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results.push("calling first");
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const promise = source.first();
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assert_array_equals(results, [
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"calling first",
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"source subscribe",
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"before source next 1",
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"source abort",
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"source teardown",
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"after source next 1"
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], "Array values after first() is called");
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const firstValue = await promise;
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results.push(`first resolved with: ${firstValue}`);
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assert_array_equals(results, [
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"calling first",
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"source subscribe",
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"before source next 1",
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"source abort",
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"source teardown",
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"after source next 1",
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"first resolved with: 1",
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], "Array values after Promise is awaited");
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}, "first(): Lifecycle");
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