Adding tests for mocha and jest

test/lib/helpers.js

@@ -0,0 +1,94 @@
+/** For static usage w/o launching a server */
+module.exports = exports = {
+  get chai() { return _chai() },
+  get expect(){ return this.chai.expect },
+  get assert(){ return this.chai.assert },
+}
+
+// harmonizing jest and mocha
+if (global.test) { // it's jest
+  global.before = global.beforeAll
+  global.after = global.afterAll
+} else { // it's mocha
+  global.beforeAll = global.before
+  global.afterAll = global.after
+}
+
+// lazy-loading chai
+function _chai(){
+  const chai = exports.chai = require('chai')
+  .use (require('chai-as-promised'))
+  .use (require('chai-subset'))
+  chai.should()
+  return chai
+}
+
+
+/** Launching and testing a cds server */
+exports.launch = (project, args=['--in-memory?']) => {
+
+  const cds = require('@sap/cds')
+
+  if (!cds.utils.existsSync(project)) try {
+    project = require('path').dirname (require.resolve(project+'/package.json'))
+  } catch(e) {
+    throw cds.error (`Cannot resolve project folder for '${project}'`)
+  }
+
+  const axios = require('axios').default
+  let baseURL //... be filled in below
+
+  // launch cds server...
+  before (done => {
+
+    const console = global.console, logs=[]
+    global.console = { __proto__: global.console, logs,
+      time: ()=>{}, timeEnd: (...args)=> logs.push(args),
+      debug: (...args)=> logs.push(args),
+      log: (...args)=> logs.push(args),
+      warn: (...args)=> logs.push(args),
+      error: (...args)=> logs.push(args),
+      dump(){ for (let each of logs) console.log (...each) },
+    }
+
+    process.env.PORT = '0'
+    const p = cds.exec ('run', project, ...args) // TODO w/ @sap/cds@3.33.3: , '--port', '0')
+    if (p && 'catch' in p) p.catch (done)
+
+    cds.once('listening', ({ server, url }) => {
+      after (done => {
+        if (global.console !== console) global.console = console
+        server.close (done)
+      })
+      baseURL = url
+      done()
+    })
+  })
+
+  return {
+
+    GET: (path) => axios.get (baseURL+path) .catch(_error),
+    PUT: (path,data) => axios.put (baseURL+path,data) .catch(_error),
+    POST: (path,data) => axios.post (baseURL+path,data) .catch(_error),
+    PATCH: (path,data) => axios.patch (baseURL+path,data) .catch(_error),
+    DELETE: (path) => axios.delete (baseURL+path) .catch(_error),
+
+    get: (path) => axios.get (baseURL+path) .catch(_error),
+    put: (path,data) => axios.put (baseURL+path,data) .catch(_error),
+    post: (path,data) => axios.post (baseURL+path,data) .catch(_error),
+    patch: (path,data) => axios.patch (baseURL+path,data) .catch(_error),
+    delete: (path) => axios.delete (baseURL+path) .catch(_error),
+
+    get chai(){ return _chai() },
+    get expect(){ return this.chai.expect },
+    get assert(){ return this.chai.assert },
+  }
+
+  function _error (e) {
+    if (!e.response)  throw e
+    if (!e.response.data)  throw e
+    if (!e.response.data.error)  throw e
+    const { code, message } = e.response.data.error
+    throw new Error (`${code} - ${message}`)
+  }
+}