File size: 3,623 Bytes
fd2c364 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 | import { render, screen, fireEvent } from "@testing-library/react";
import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
import {
MarkdownTableScroll,
readScrollFadeState,
} from "#/components/features/markdown/markdown-table-scroll";
function mockScrollMetrics(
element: HTMLElement,
metrics: { scrollWidth: number; clientWidth: number; scrollLeft: number },
) {
Object.defineProperty(element, "scrollWidth", {
configurable: true,
value: metrics.scrollWidth,
});
Object.defineProperty(element, "clientWidth", {
configurable: true,
value: metrics.clientWidth,
});
Object.defineProperty(element, "scrollLeft", {
configurable: true,
writable: true,
value: metrics.scrollLeft,
});
}
describe("readScrollFadeState", () => {
it("hides both fades when the table fits", () => {
const element = document.createElement("div");
mockScrollMetrics(element, {
scrollWidth: 400,
clientWidth: 400,
scrollLeft: 0,
});
expect(readScrollFadeState(element)).toEqual({ left: false, right: false });
});
it("shows only the right fade at the start of an overflowing table", () => {
const element = document.createElement("div");
mockScrollMetrics(element, {
scrollWidth: 800,
clientWidth: 300,
scrollLeft: 0,
});
expect(readScrollFadeState(element)).toEqual({ left: false, right: true });
});
it("shows both fades in the middle of an overflowing table", () => {
const element = document.createElement("div");
mockScrollMetrics(element, {
scrollWidth: 800,
clientWidth: 300,
scrollLeft: 250,
});
expect(readScrollFadeState(element)).toEqual({ left: true, right: true });
});
it("shows only the left fade at the end of an overflowing table", () => {
const element = document.createElement("div");
mockScrollMetrics(element, {
scrollWidth: 800,
clientWidth: 300,
scrollLeft: 500,
});
expect(readScrollFadeState(element)).toEqual({ left: true, right: false });
});
});
describe("MarkdownTableScroll", () => {
beforeEach(() => {
vi.stubGlobal(
"ResizeObserver",
class {
observe = vi.fn();
unobserve = vi.fn();
disconnect = vi.fn();
},
);
});
afterEach(() => {
vi.unstubAllGlobals();
});
it("renders animated edge fades that toggle with horizontal scroll", () => {
render(
<MarkdownTableScroll>
<table>
<tbody>
<tr>
<td>Wide content</td>
</tr>
</tbody>
</table>
</MarkdownTableScroll>,
);
const scroller = screen.getByTestId("markdown-table-scroll");
const leftFade = screen.getByTestId("markdown-table-scroll-fade-left");
const rightFade = screen.getByTestId("markdown-table-scroll-fade-right");
mockScrollMetrics(scroller, {
scrollWidth: 900,
clientWidth: 320,
scrollLeft: 0,
});
fireEvent.scroll(scroller);
expect(rightFade).toHaveAttribute("data-visible", "true");
expect(rightFade).toHaveClass("opacity-100");
expect(leftFade).toHaveAttribute("data-visible", "false");
expect(leftFade).toHaveClass("opacity-0");
mockScrollMetrics(scroller, {
scrollWidth: 900,
clientWidth: 320,
scrollLeft: 580,
});
fireEvent.scroll(scroller);
expect(leftFade).toHaveAttribute("data-visible", "true");
expect(leftFade).toHaveClass("opacity-100");
expect(rightFade).toHaveAttribute("data-visible", "false");
expect(rightFade).toHaveClass("opacity-0");
});
});
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