archived-board-voter/crates/backend/tests/specs/index.e2e.js

// calculates the luma from a hex color `#abcdef`
function luma(hex) {
  if (hex.startsWith("#")) {
    hex = hex.substring(1);
  }

  const rgb = parseInt(hex, 16);
  const r = (rgb >> 16) & 0xff;
  const g = (rgb >> 8) & 0xff;
  const b = (rgb >> 0) & 0xff;
  return 0.2126 * r + 0.7152 * g + 0.0722 * b;
}

describe("Hello Tauri", () => {
  it("should be cordial", async () => {
    const header = await $("body > h1");
    const text = await header.getText();
    expect(text).toMatch(/^[hH]ello/);
  });

  it("should be excited", async () => {
    const header = await $("body > h1");
    const text = await header.getText();
    expect(text).toMatch(/!$/);
  });

  it("should be easy on the eyes", async () => {
    const body = await $("body");
    const backgroundColor = await body.getCSSProperty("background-color");
    expect(luma(backgroundColor.parsed.hex)).toBeLessThan(100);
  });
});