chore: migrate test cases from Chai to Jest

src/liquid-options.spec.ts

@@ -0,0 +1,10 @@
+import { normalize } from './liquid-options'
+
+describe('liquid-options', () => {
+  describe('.normalize()', () => {
+    it('should set cache to undefined if specified to falsy', () => {
+      const options = normalize({ cache: false })
+      expect(options.cache).toBeUndefined()
+    })
+  })
+})