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promise_test(async () => {
let inactiveAfterFirstGood = true;
const source = new Observable(subscriber => {
subscriber.next("good");
inactiveAfterFirstGood = !subscriber.active;
subscriber.next("good");
subscriber.next("good");
subscriber.complete();
});
const result = await source.some((value) => value === "good");
assert_true(result, "Promise resolves with true if any value passes the predicate");
assert_true(inactiveAfterFirstGood,
"subscriber is inactive after the first value that passes the " +
"predicate, because the source was unsubscribed from");
}, "some(): subscriber is inactive after the first value that passes the predicate, because the source was unsubscribed from");
promise_test(async () => {
const source = new Observable(subscriber => {
subscriber.next("bad");
subscriber.next("bad");
subscriber.next("bad");
subscriber.complete();
});
const result = await source.some((value) => value === "good");
assert_false(result, "some(): Promise resolves with false if no value passes the predicate");
});
promise_test(async () => {
const source = new Observable(subscriber => {
subscriber.next("bad");
subscriber.next("bad");
subscriber.next("good");
subscriber.complete();
});
const result = await source.some((value) => value === "good");
assert_true(result, "some(): Promise resolves with true if any value passes the predicate");
});
promise_test(async t => {
const source = new Observable(subscriber => {
subscriber.next("not used");
});
const error = new Error("thrown from predicate");
promise_rejects_exactly(t, error, source.some(() => {throw error}),
"The returned promise rejects with an error if the predicate errors");
}, "some(): The returned promise rejects with an error if the predicate errors");
promise_test(async t => {
const error = new Error("error from source");
const source = new Observable(subscriber => {
subscriber.error(error);
});
promise_rejects_exactly(t, error, source.some(() => true),
"The returned promise rejects with an error if the source observable errors");
}, "some(): The returned promise rejects with an error if the source observable errors");
promise_test(async () => {
const source = new Observable(subscriber => {
subscriber.complete();
});
const result = await source.some(() => true);
assert_false(result,
"The returned promise resolves as false if the source observable " +
"completes without emitting a value");
}, "some(): The returned promise resolves as false if the source observable " +
"completes without emitting a value");
promise_test(async t => {
let teardownCalled = false;
const source = new Observable(subscriber => {
subscriber.addTeardown(() => {
teardownCalled = true;
});
});
const controller = new AbortController();
const promise = source.some(() => true, { signal: controller.signal });
controller.abort();
promise_rejects_dom(t, 'AbortError', promise);
assert_true(teardownCalled,
"The teardown function is called when the signal is aborted");
}, "some(): The return promise rejects with a DOMException if the signal is aborted");
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