Add unicode based tests for RabinKarp.

Author: trekhleb

src/algorithms/string/rabin-karp/__test__/rabinKarp.test.js

@@ -37,6 +37,7 @@ describe('rabinKarp', () => {
   it('should work with UTF symbols', () => {
     expect(rabinKarp('a\u{ffff}', '\u{ffff}')).toBe(1);
     expect(rabinKarp('\u0000耀\u0000', '耀\u0000')).toBe(1);
-    // expect(rabinKarp('a\u{10000}', '\u{10000}')).toBe(1);
+    expect(rabinKarp('a\u{20000}', '\u{20000}')).toBe(1);
+    expect(rabinKarp('ab\u{20005}a', '\u{20005}a')).toBe(2);
   });
 });