chore: migrate test cases from Chai to Jest

test/stub/render.ts

@@ -1,6 +1,5 @@
 import { Liquid } from '../../src/liquid'
 import { LiquidOptions } from '../../src/liquid-options'
-import { expect } from 'chai'
 
 export const liquid = new Liquid()
 
@@ -15,6 +14,6 @@ export async function test (src: string, ctx: object | string, expected?: string
   }
   const engine = opts ? new Liquid(opts) : liquid
   const result = await engine.parseAndRender(src, ctx as object)
-  if (expected instanceof RegExp) return expect(result).to.match(expected)
-  return expect(result).to.equal(expected)
+  if (expected instanceof RegExp) return expect(result).toMatch(expected)
+  return expect(result).toBe(expected)
 }