test suit updated

test/svg-utils.test.js

@@ -0,0 +1,45 @@
+const { FONT_FAMILY, calcFontSize, estimateTextWidth } = require('../src/lib/svg-utils');
+
+describe('svg-utils', () => {
+
+  describe('FONT_FAMILY', () => {
+    it('should be a non-empty string', () => {
+      expect(typeof FONT_FAMILY).toBe('string');
+      expect(FONT_FAMILY.length).toBeGreaterThan(0);
+    });
+
+    it('should contain Verdana', () => {
+      expect(FONT_FAMILY).toContain('Verdana');
+    });
+  });
+
+  describe('calcFontSize', () => {
+    it('should return 60% of size rounded', () => {
+      expect(calcFontSize(24)).toBe(14);
+      expect(calcFontSize(100)).toBe(60);
+      expect(calcFontSize(16)).toBe(10);
+    });
+
+    it('should round correctly', () => {
+      expect(calcFontSize(25)).toBe(15);
+      expect(calcFontSize(33)).toBe(20); // 33 * 0.6 = 19.8 → 20
+    });
+  });
+
+  describe('estimateTextWidth', () => {
+    it('should estimate width based on text length and font size', () => {
+      const width = estimateTextWidth('Hello', 14);
+      expect(width).toBe(5 * 14 * 0.6); // 42
+    });
+
+    it('should return 0 for empty string', () => {
+      expect(estimateTextWidth('', 14)).toBe(0);
+    });
+
+    it('should scale linearly with font size', () => {
+      const w1 = estimateTextWidth('test', 10);
+      const w2 = estimateTextWidth('test', 20);
+      expect(w2).toBe(w1 * 2);
+    });
+  });
+});