test: fix two type errors

Mentioned in last commit.

Author: wincent

packages/legacy/src/lexer/__tests__/Lexer-test.ts

@@ -480,7 +480,12 @@ describe('Lexer()', () => {
       lexer.lex('foo').next();
 
       expect(onMatch.mock.calls.length).toBe(1);
-      expect(onMatch.mock.calls[0][0][0]).toBe('foo');
+      const array = onMatch.mock.calls[0][0];
+      if (Array.isArray(array)) {
+        expect(array[0]).toBe('foo');
+      } else {
+        throw new Error('expected Array');
+      }
       expect(onMatch.mock.calls[0][1]).toBe(meta);
     });
 

packages/lexer/src/RegExp/__tests__/normalizeCharacterClass-test.ts

@@ -1,4 +1,4 @@
-import {describe, expect, fail, it} from '@jest/globals';
+import {describe, expect, it} from '@jest/globals';
 
 import RegExpParser from '../RegExpParser';
 import normalizeCharacterClass from '../normalizeCharacterClass';
@@ -159,7 +159,7 @@ describe('normalizeCharacterClass()', () => {
 
   function assertCharacterClass(node: Node): asserts node is CharacterClass {
     if (node.kind !== 'CharacterClass') {
-      fail('Needed CharacterClass');
+      throw new Error('Needed CharacterClass');
     }
   }