test(svg): verify null deltaPercentage renders as N/A in generateMonthlySVG

Author: ShafinNigamana

lib/svg/generator.test.ts

@@ -1048,6 +1048,41 @@ describe('generateMonthlySVG', () => {
 
     expect(svg).toContain('COMMITS THIS MONTH');
   });
+
+  it('renders monthly stats correctly with null deltaPercentage for delta_format percent', () => {
+    const nullDeltaStats: MonthlyStats = {
+      currentMonthTotal: 15,
+      previousMonthTotal: 0,
+      deltaPercentage: null,
+      deltaAbsolute: 15,
+      currentMonthName: 'June',
+    };
+
+    const svg = generateMonthlySVG(nullDeltaStats, {
+      user: 'octocat',
+      delta_format: 'percent',
+    } as unknown as BadgeParams);
+
+    expect(svg).toContain('N/A');
+    expect(svg).not.toContain('%');
+  });
+
+  it('renders monthly stats correctly with null deltaPercentage for delta_format both', () => {
+    const nullDeltaStats: MonthlyStats = {
+      currentMonthTotal: 15,
+      previousMonthTotal: 0,
+      deltaPercentage: null,
+      deltaAbsolute: 15,
+      currentMonthName: 'June',
+    };
+
+    const svg = generateMonthlySVG(nullDeltaStats, {
+      user: 'octocat',
+      delta_format: 'both',
+    } as unknown as BadgeParams);
+
+    expect(svg).toContain('N/A (+15)');
+  });
 });
 
 describe('shading and gradients', () => {