59 lines
1.8 KiB
TypeScript
59 lines
1.8 KiB
TypeScript
/*
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Copyright 2024 New Vector Ltd.
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Copyright 2021 The Matrix.org Foundation C.I.C.
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SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
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Please see LICENSE files in the repository root for full details.
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*/
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import { FixedRollingArray } from "../../src/utils/FixedRollingArray";
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describe("FixedRollingArray", () => {
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it("should seed the array with the given value", () => {
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const seed = "test";
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const width = 24;
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const array = new FixedRollingArray(width, seed);
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expect(array.value.length).toBe(width);
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expect(array.value.every((v) => v === seed)).toBe(true);
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});
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it("should insert at the correct end", () => {
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const seed = "test";
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const value = "changed";
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const width = 24;
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const array = new FixedRollingArray(width, seed);
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array.pushValue(value);
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expect(array.value.length).toBe(width);
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expect(array.value[0]).toBe(value);
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});
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it("should roll over", () => {
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const seed = -1;
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const width = 24;
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const array = new FixedRollingArray(width, seed);
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const maxValue = width * 2;
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const minValue = width; // because we're forcing a rollover
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for (let i = 0; i <= maxValue; i++) {
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array.pushValue(i);
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}
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expect(array.value.length).toBe(width);
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for (let i = 1; i < width; i++) {
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const current = array.value[i];
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const previous = array.value[i - 1];
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expect(previous - current).toBe(1);
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if (i === 1) {
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// eslint-disable-next-line jest/no-conditional-expect
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expect(previous).toBe(maxValue);
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} else if (i === width) {
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// eslint-disable-next-line jest/no-conditional-expect
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expect(current).toBe(minValue);
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}
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}
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});
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});
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