54 lines
1.2 KiB
TypeScript
54 lines
1.2 KiB
TypeScript
import { describe, expect, test } from "vitest";
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import { getNearestTriggerScrollTop } from "./assistant-trigger-scroll";
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describe("getNearestTriggerScrollTop", () => {
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test("keeps a fully visible highlighted item in place", () => {
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expect(
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getNearestTriggerScrollTop({
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scrollTop: 120,
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viewportTop: 100,
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viewportBottom: 400,
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itemTop: 180,
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itemBottom: 228,
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}),
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).toBe(120);
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});
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test("scrolls down only enough to reveal the highlighted item", () => {
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expect(
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getNearestTriggerScrollTop({
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scrollTop: 120,
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viewportTop: 100,
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viewportBottom: 400,
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itemTop: 388,
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itemBottom: 436,
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}),
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).toBe(156);
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});
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test("scrolls up only enough to reveal the highlighted item", () => {
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expect(
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getNearestTriggerScrollTop({
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scrollTop: 120,
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viewportTop: 100,
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viewportBottom: 400,
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itemTop: 72,
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itemBottom: 120,
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}),
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).toBe(92);
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});
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test("clamps upward scrolling at the start of the list", () => {
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expect(
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getNearestTriggerScrollTop({
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scrollTop: 12,
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viewportTop: 100,
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viewportBottom: 400,
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itemTop: 40,
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itemBottom: 88,
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}),
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).toBe(0);
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});
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});
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