chore: migrate test cases from Chai to Jest

test/e2e/express.spec.ts

@@ -0,0 +1,69 @@
+import * as request from 'supertest'
+import * as express from 'express'
+import { resolve } from 'path'
+import { Liquid } from '../..'
+
+describe('express()', function () {
+  const root = resolve(__dirname, '../stub/root')
+  const views = resolve(__dirname, '../stub/views')
+  const partials = resolve(__dirname, '../stub/partials')
+  let app: express.Application, engine: Liquid
+
+  beforeEach(function () {
+    app = express()
+    engine = new Liquid({
+      root,
+      extname: '.html'
+    })
+
+    app.set('view engine', 'html')
+    app.engine('html', engine.express())
+
+    app.get('/name', (req, res) => res.render('name', {
+      name: 'harttle'
+    }))
+    app.get('/include/:file', (req, res) => res.render('include', {
+      file: req.params.file
+    }))
+  })
+  it('should respect express views(array)', function (done) {
+    app.set('views', [views])
+    request(app).get('/name')
+      .expect('My name is harttle.')
+      .expect(200, done)
+  })
+  it('should respect express views(string)', function (done) {
+    app.set('views', views)
+    request(app).get('/include/bar')
+      .expect('bar')
+      .expect(200, done)
+  })
+  it('should pass error when file not found', function (done) {
+    const view = {
+      root: []
+    }
+    const file = '/not-exist.html'
+    const ctx = {}
+    engine.express().call(view, file, ctx, function (err: any) {
+      try {
+        expect(err.code).toBe('ENOENT')
+        expect(err.message).toMatch(/Failed to lookup/)
+        done()
+      } catch (e) {
+        done(e)
+      }
+    })
+  })
+  it('should respect root option when lookup', function (done) {
+    app.set('views', [views])
+    request(app).get('/include/foo')
+      .expect('foo')
+      .expect(200, done)
+  })
+  it('should respect express views (Array) when lookup', function (done) {
+    app.set('views', [views, partials])
+    request(app).get('/include/bar')
+      .expect('bar')
+      .expect(200, done)
+  })
+})