test(api): add schema-level validation test for invalid accent hex color

Author: mdtaha-dev

app/api/streak/route.test.ts

@@ -608,6 +608,12 @@ describe('GET /api/streak', () => {
     it('does not crash when an invalid text color is provided', async () => {
       const response = await GET(makeRequest({ user: 'octocat', text: 'notacolor' }));
 
+      expect(response.status).toBe(400);
+    });
+    it('returns 400 when an invalid hex color is passed as accent', async () => {
+      // #ZZZZZZZ contains non-hex characters — schema must reject it with 400
+      const response = await GET(makeRequest({ user: 'octocat', accent: '#ZZZZZZZ' }));
+
       expect(response.status).toBe(400);
     });
   });

lib/validations.test.ts

@@ -647,3 +647,24 @@ describe('streakParamsSchema — view fallback behavior', () => {
     expect(parse({}).view).toBe('default');
   });
 });
+
+describe('streakParamsSchema — accent parameter HEX color validation', () => {
+  it('rejects an invalid hex color like "#ZZZZZZZ" for accent', () => {
+    // #ZZZZZZZ contains non-hex characters — must fail schema validation
+    const result = streakParamsSchema.safeParse({
+      user: 'octocat',
+      accent: '#ZZZZZZZ',
+    });
+
+    expect(result.success).toBe(false);
+  });
+
+  it('accepts a valid 6-character hex color for accent', () => {
+    const result = streakParamsSchema.safeParse({
+      user: 'octocat',
+      accent: 'ff0000',
+    });
+
+    expect(result.success).toBe(true);
+  });
+});