diff --git a/client/src/templates/Challenges/components/pinyin-to-hanzi-input.test.tsx b/client/src/templates/Challenges/components/pinyin-to-hanzi-input.test.tsx
index da71228028a..63a8a6849e7 100644
--- a/client/src/templates/Challenges/components/pinyin-to-hanzi-input.test.tsx
+++ b/client/src/templates/Challenges/components/pinyin-to-hanzi-input.test.tsx
@@ -100,6 +100,17 @@ describe('convertToHanzi', () => {
       '你好'
     );
   });
+
+  test('should convert "v" to "ü" and support tone marks', () => {
+    // Correct tone gets converted to hanzi
+    expect(convertToHanzi('nv3', { hanzi: '女', pinyin: 'nǚ' })).toBe('女');
+
+    // Incorrect tones stay as pinyin
+    expect(convertToHanzi('nv1', { hanzi: '女', pinyin: 'nǚ' })).toBe('nǖ');
+    expect(convertToHanzi('nv2', { hanzi: '女', pinyin: 'nǚ' })).toBe('nǘ');
+    expect(convertToHanzi('nv4', { hanzi: '女', pinyin: 'nǚ' })).toBe('nǜ');
+    expect(convertToHanzi('nv5', { hanzi: '女', pinyin: 'nǚ' })).toBe('nü');
+  });
 });
 
 describe('PinyinToHanziInput component', () => {