test(generator-themeLookup): create isolated helper tests

Author: tamilr0727-ux

lib/svg/generator.themeLookup.test.ts

@@ -0,0 +1,34 @@
+// lib/svg/generator.themeLookup.test.ts
+
+import { describe, it, expect, vi } from 'vitest';
+import { resolveFont } from './generator';
+
+describe('themeLookup / font resolving behavior', () => {
+  it('should return null if no font parameter is provided', () => {
+    expect(resolveFont()).toBeNull();
+    expect(resolveFont(null)).toBeNull();
+    expect(resolveFont('')).toBeNull();
+  });
+
+  it('should resolve bundled fonts standard parameters correctly', () => {
+    expect(resolveFont('jetbrains')).toBe('"JetBrains Mono", monospace');
+    expect(resolveFont('fira')).toBe('"Fira Code", monospace');
+    expect(resolveFont('roboto')).toBe('"Roboto", sans-serif');
+  });
+
+  it('should resolve previously missing bundled fonts without dynamic dynamic google font trigger', () => {
+    expect(resolveFont('syncopate')).toBe('"Syncopate", sans-serif');
+    expect(resolveFont('spacegrotesk')).toBe('"Space Grotesk", sans-serif');
+  });
+
+  it('should remain robust and case-insensitive under out-of-bounds or spaced inputs', () => {
+    expect(resolveFont('JETBRAINS')).toBe('"JetBrains Mono", monospace');
+    expect(resolveFont('space grotesk')).toBe('"Space Grotesk", sans-serif');
+    expect(resolveFont('JetBrains Mono')).toBe('"JetBrains Mono", monospace');
+  });
+
+  it('should fall back gracefully to a standard sans-serif font stack for unrecognized dynamic fonts', () => {
+    expect(resolveFont('Comic Sans')).toBe('"Comic Sans", sans-serif');
+    expect(resolveFont('custom-font')).toBe('"custom-font", sans-serif');
+  });
+});