2024-06-17 02:31:31 +00:00
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This package provides utilities for testing.
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- [BDD style testing](https://jsr.io/@std/testing/doc/bdd/~)
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- [Test doubles (mocking)](https://jsr.io/@std/testing/doc/mock/~)
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- [Faking time and timers](https://jsr.io/@std/testing/doc/time/~)
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- [Snapshot testing](https://jsr.io/@std/testing/doc/snapshot/~)
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- [Type assertions](https://jsr.io/@std/testing/doc/types/~)
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2024-06-26 06:26:28 +00:00
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```ts
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import { assertSpyCalls, spy } from "@std/testing/mock";
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import { FakeTime } from "@std/testing/time";
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function secondInterval(cb: () => void): number {
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return setInterval(cb, 1000);
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}
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Deno.test("secondInterval calls callback every second and stops after being cleared", () => {
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using time = new FakeTime();
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const cb = spy();
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const intervalId = secondInterval(cb);
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assertSpyCalls(cb, 0);
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time.tick(500);
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assertSpyCalls(cb, 0);
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time.tick(500);
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assertSpyCalls(cb, 1);
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time.tick(3500);
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assertSpyCalls(cb, 4);
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clearInterval(intervalId);
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time.tick(1000);
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assertSpyCalls(cb, 4);
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});
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```
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