feat(ascii-art): 17 hand-coded font tables (5 existing + 12 new) with snapshot tests

Amit Haridas
2026-10-01 17:29:29 +05:30 · 2026-09-14 20:27:03 +05:30
parent 3fbb47000e
commit 5385e159ed
3 changed files with 3615 additions and 0 deletions
@@ -0,0 +1,80 @@
+/**
+ * @jest-environment node
+ *
+ * Per-font snapshot tests for the 17 hand-coded ASCII art fonts. Snapshots
+ * are the safety net that catches drift when the font tables are hand-edited.
+ * Line endings are normalized to \n and trailing whitespace is trimmed so
+ * editor auto-trim does not produce spurious diffs.
+ */
+const AsciiArtFonts = require('../../src/main/AsciiArt.fonts');
+
+const FONT_IDS = Object.freeze([
+  // 5 existing
+  'standard',
+  'banner',
+  'block',
+  'bubble',
+  'digital',
+  // 12 new
+  'big',
+  'small',
+  'lean',
+  'slant',
+  'isometric1',
+  'isometric2',
+  'isometric3',
+  'isometric4',
+  'three-d',
+  'three-x-five',
+  'ansi-shadow',
+  'calvin-s',
+]);
+
+const normalize = (s) => s.replace(/\r\n/g, '\n').replace(/[ \t]+\n/g, '\n');
+
+describe('AsciiArt.fonts table shape', () => {
+  test.each(FONT_IDS)('%s has height and chars for A-Z 0-9 and space', (id) => {
+    const font = AsciiArtFonts.HAND_CODED_FONTS[id];
+    expect(font).toBeDefined();
+    expect(typeof font.height).toBe('number');
+    expect(font.height).toBeGreaterThanOrEqual(4);
+    expect(font.height).toBeLessThanOrEqual(8);
+    expect(typeof font.chars).toBe('object');
+    for (const ch of 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 '.split('')) {
+      expect(font.chars[ch]).toBeDefined();
+      expect(font.chars[ch]).toHaveLength(font.height);
+      for (const line of font.chars[ch]) {
+        expect(typeof line).toBe('string');
+      }
+    }
+  });
+});
+
+describe('AsciiArt.fonts HELLO snapshot per font', () => {
+  test.each(FONT_IDS)('%s', (id) => {
+    const font = AsciiArtFonts.HAND_CODED_FONTS[id];
+    const lines = Array(font.height).fill('');
+    for (const ch of 'HELLO') {
+      const glyph = font.chars[ch] || font.chars[' '];
+      for (let i = 0; i < font.height; i++) lines[i] += glyph[i];
+    }
+    expect(normalize(lines.join('\n'))).toMatchSnapshot();
+  });
+});
+
+describe('AsciiArt.fonts edge cases', () => {
+  test('unknown character falls back to space glyph (preserves column width)', () => {
+    const font = AsciiArtFonts.HAND_CODED_FONTS.standard;
+    const fallback = font.chars[' '];
+    const unknown = font.chars['é'];
+    expect(unknown).toEqual(fallback);
+  });
+
+  test('all digit glyphs exist for standard', () => {
+    const font = AsciiArtFonts.HAND_CODED_FONTS.standard;
+    for (const d of '0123456789') {
+      expect(font.chars[d]).toBeDefined();
+      expect(font.chars[d]).toHaveLength(font.height);
+    }
+  });
+});