chore: add tests

Author: mdjastrzebski

src/components/__tests__/character-class.test.ts

@@ -41,6 +41,8 @@ test('"characterClass" base cases', () => {
 
   expect(buildPattern('x', characterClass(['a', 'z']))).toBe('x[a-z]');
   expect(buildPattern(characterClass(['a', 'z']), 'x')).toBe('[a-z]x');
+
+  expect(buildPattern(characterClass(['a', 'z'], '-', 'x'))).toBe('[-a-zx]');
 });
 
 test('"any" character class', () => {