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promise_test(async () => {
const source = new Observable(subscriber => {
// Never exposed to the `last()` promise.
subscriber.next(1);
subscriber.next(2);
subscriber.complete();
});
const value = await source.last();
assert_equals(value, 2);
}, "last(): Promise resolves to last value");
promise_test(async () => {
const error = new Error("error from source");
const source = new Observable(subscriber => {
subscriber.error(error);
});
let rejection = null;
try {
await source.last();
} catch (e) {
rejection = e;
}
assert_equals(rejection, error);
}, "last(): Promise rejects with emitted error");
promise_test(async () => {
const source = new Observable(subscriber => {
subscriber.complete();
});
let rejection = null;
try {
await source.last();
} catch (e) {
rejection = e;
}
assert_true(rejection instanceof RangeError,
"Promise rejects with RangeError");
assert_equals(rejection.message, "No values in Observable");
}, "last(): Promise rejects with RangeError when source Observable " +
"completes without emitting any values");
promise_test(async () => {
const source = new Observable(subscriber => {});
const controller = new AbortController();
const promise = source.last({ signal: controller.signal });
controller.abort();
let rejection = null;
try {
await promise;
} catch (e) {
rejection = e;
}
assert_true(rejection instanceof DOMException,
"Promise rejects with a DOMException for abortion");
assert_equals(rejection.name, "AbortError",
"Rejected with 'AbortError' DOMException");
assert_equals(rejection.message, "signal is aborted without reason");
}, "last(): Aborting a signal rejects the Promise with an AbortError DOMException");
promise_test(async () => {
const results = [];
const source = new Observable(subscriber => {
results.push("source subscribe");
subscriber.addTeardown(() => results.push("source teardown"));
subscriber.signal.addEventListener("abort", () => results.push("source abort"));
results.push("before source next 1");
subscriber.next(1);
results.push("after source next 1");
results.push("before source complete");
subscriber.complete();
results.push("after source complete");
});
results.push("calling last");
const promise = source.last();
assert_array_equals(results, [
"calling last",
"source subscribe",
"before source next 1",
"after source next 1",
"before source complete",
"source teardown",
"source abort",
"after source complete",
], "Array values after last() is called");
const lastValue = await promise;
results.push(`last resolved with: ${lastValue}`);
assert_array_equals(results, [
"calling last",
"source subscribe",
"before source next 1",
"after source next 1",
"before source complete",
"source teardown",
"source abort",
"after source complete",
"last resolved with: 1",
], "Array values after Promise is awaited");
}, "last(): Lifecycle");
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