57 lines
1.7 KiB
TypeScript
57 lines
1.7 KiB
TypeScript
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/*
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Copyright 2025 New Vector Ltd.
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SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
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Please see LICENSE in the repository root for full details.
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*/
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import { describe, expect, it } from "vitest";
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import { Epoch, mapEpoch, trackEpoch } from "./ObservableScope";
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import { withTestScheduler } from "../utils/test";
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describe("Epoch", () => {
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it("should map the value correctly", () => {
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const epoch = new Epoch(1);
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const mappedEpoch = epoch.mapInner((v) => v + 1);
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expect(mappedEpoch.value).toBe(2);
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expect(mappedEpoch.epoch).toBe(0);
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});
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it("should be tracked from an observable", () => {
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withTestScheduler(({ expectObservable, behavior }) => {
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const observable$ = behavior("abc", {
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a: 1,
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b: 2,
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c: 3,
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});
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const epochObservable$ = observable$.pipe(trackEpoch());
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expectObservable(epochObservable$).toBe("abc", {
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a: expect.toSatisfy((e) => e.epoch === 0 && e.value === 1),
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b: expect.toSatisfy((e) => e.epoch === 1 && e.value === 2),
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c: expect.toSatisfy((e) => e.epoch === 2 && e.value === 3),
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});
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});
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});
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it("can be mapped without loosing epoch information", () => {
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withTestScheduler(({ expectObservable, behavior }) => {
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const observable$ = behavior("abc", {
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a: "A",
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b: "B",
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c: "C",
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});
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const epochObservable$ = observable$.pipe(trackEpoch());
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const derivedEpoch$ = epochObservable$.pipe(
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mapEpoch((e) => e + "-mapped"),
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);
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expectObservable(derivedEpoch$).toBe("abc", {
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a: new Epoch("A-mapped", 0),
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b: new Epoch("B-mapped", 1),
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c: new Epoch("C-mapped", 2),
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});
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});
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});
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});
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