85 lines
2.8 KiB
JavaScript
85 lines
2.8 KiB
JavaScript
promise_test(async () => {
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let inactiveAfterB = false;
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const source = new Observable(subscriber => {
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subscriber.next("a");
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subscriber.next("b");
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inactiveAfterB = !subscriber.active;
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subscriber.next("c");
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subscriber.complete();
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});
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const value = await source.find((value) => value === "b");
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assert_equals(value, "b", "Promise resolves with the first value that passes the predicate");
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assert_true(inactiveAfterB, "subscriber is inactive after the first value that passes the predicate");
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}, "find(): Promise resolves with the first value that passes the predicate");
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promise_test(async () => {
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const source = new Observable(subscriber => {
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subscriber.next("a");
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subscriber.next("b");
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subscriber.next("c");
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subscriber.complete();
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});
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const value = await source.find(() => false);
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assert_equals(value, undefined, "Promise resolves with undefined if no value passes the predicate");
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}, "find(): Promise resolves with undefined if no value passes the predicate");
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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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promise_rejects_exactly(t, error, source.find(() => true), "Promise " +
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"rejects with the error emitted from the source Observable");
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}, "find(): 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.next("ignored");
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});
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const error = new Error("thrown from predicate");
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promise_rejects_exactly(t, error, source.find(() => {throw error}),
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"Promise rejects with any error thrown from the predicate");
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}, "find(): Promise rejects with any error thrown from the predicate");
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promise_test(async () => {
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let indices = [];
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const source = new Observable(subscriber => {
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subscriber.next("a");
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subscriber.next("b");
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subscriber.next("c");
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subscriber.complete();
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});
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const value = await source.find((value, index) => {
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indices.push(index);
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return false;
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});
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assert_equals(value, undefined, "Promise resolves with undefined if no value passes the predicate");
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assert_array_equals(indices, [0, 1, 2], "find(): Passes the index of the value to the predicate");
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}, "find(): Passes the index of the value to the predicate");
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promise_test(async t => {
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const controller = new AbortController();
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const source = new Observable(subscriber => {
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subscriber.next("a");
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subscriber.next("b");
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subscriber.next("c");
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subscriber.complete();
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});
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controller.abort();
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const promise = source.find(() => true, { signal: controller.signal });
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promise_rejects_dom(t, 'AbortError', promise, "Promise rejects with " +
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"DOMException when the signal is aborted");
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}, "find(): Rejects with AbortError when the signal is aborted");
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