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* Define matchers to test promise fulfillment These are useful for validating that promises depend on other events prior to fulfilling. * Expose custom matchers to jest projects Team-specific projects are not touched here to try and reduce review burden. * Block browser local operations awaiting reseed This should closes a narrow race condition resulting from storage operations during a reseed event. * Import from barrel file This might fix the failing test, but I'm not sure _why_ * Document helper methods * Validate as few properties as possible per test * Simplify expected value representation * Allow waiting in promise matchers * Specify resolution times in promise orchestration tests. * Test behavior triggering multiple reseeds. * Fix typo * Avoid testing implementation details * Clear reseed on startup in case a previous process was aborted in the middle of a reseed. * Correct formatting
80 lines
2.3 KiB
TypeScript
80 lines
2.3 KiB
TypeScript
async function wait(ms: number): Promise<void> {
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return new Promise((resolve) => setTimeout(resolve, ms));
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}
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/**
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* Matches whether the received promise has been fulfilled.
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*
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* Failure if the promise is not currently fulfilled.
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*
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* @param received The promise to test
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* @param withinMs The time within the promise should be fulfilled. Defaults to 0, indicating that the promise should already be fulfilled
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* @returns CustomMatcherResult indicating whether or not the test passed
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*/
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export const toBeFulfilled: jest.CustomMatcher = async function (
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received: Promise<unknown>,
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withinMs = 0,
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) {
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return {
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pass: await Promise.race([
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wait(withinMs).then(() => false),
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received.then(
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() => true,
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() => true,
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),
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]),
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message: () => `expected promise to be fulfilled`,
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};
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};
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/**
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* Matches whether the received promise has been resolved.
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*
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* Failure if the promise is not currently fulfilled or if it has been rejected.
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*
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* @param received The promise to test
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* @param withinMs The time within the promise should be resolved. Defaults to 0, indicating that the promise should already be resolved
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* @returns CustomMatcherResult indicating whether or not the test passed
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*/
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export const toBeResolved: jest.CustomMatcher = async function (
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received: Promise<unknown>,
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withinMs = 0,
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) {
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return {
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pass: await Promise.race([
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wait(withinMs).then(() => false),
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received.then(
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() => true,
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() => false,
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),
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]),
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message: () => `expected promise to be resolved`,
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};
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};
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/**
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* Matches whether the received promise has been rejected.
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*
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* Failure if the promise is not currently fulfilled or if it has been resolved, but not rejected.
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*
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* @param received The promise to test
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* @param withinMs The time within the promise should be rejected. Defaults to 0, indicating that the promise should already be rejected
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* @returns CustomMatcherResult indicating whether or not the test passed
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*/
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export const toBeRejected: jest.CustomMatcher = async function (
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received: Promise<unknown>,
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withinMs = 0,
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) {
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return {
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pass: await Promise.race([
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wait(withinMs).then(() => false),
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received.then(
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() => false,
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() => true,
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),
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]),
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message: () => `expected promise to be rejected`,
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};
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};
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