songs2vid/scripts/preview-typography.test.ts

import assert from "node:assert/strict";
import {
  artistFontSizeForWidth,
  scaleFontToPreview,
  titleFontSizeForWidth,
  watermarkFontSizeForWidth,
} from "../lib/preview-typography";

function testFontSizesMatchLayout() {
  const width = 1280;
  assert.equal(titleFontSizeForWidth(width), Math.max(22, Math.round(width * 0.032)));
  assert.equal(artistFontSizeForWidth(width), Math.max(16, Math.round(width * 0.02)));
  assert.equal(watermarkFontSizeForWidth(width), Math.max(22, Math.round(width * 0.028)));
}

function testPreviewScaling() {
  const encodeWidth = 1920;
  const titlePx = titleFontSizeForWidth(encodeWidth);
  const previewPx = scaleFontToPreview(titlePx, encodeWidth);
  assert.ok(previewPx > 0 && previewPx < titlePx);
}

testFontSizesMatchLayout();
testPreviewScaling();
console.log("preview-typography.test.ts: ok");