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express-server/node_modules/pg-pool/test/events.js

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+'use strict'
+
+const expect = require('expect.js')
+const EventEmitter = require('events').EventEmitter
+const describe = require('mocha').describe
+const it = require('mocha').it
+const Pool = require('../')
+
+describe('events', function () {
+  it('emits connect before callback', function (done) {
+    const pool = new Pool()
+    let emittedClient = false
+    pool.on('connect', function (client) {
+      emittedClient = client
+    })
+
+    pool.connect(function (err, client, release) {
+      if (err) return done(err)
+      release()
+      pool.end()
+      expect(client).to.be(emittedClient)
+      done()
+    })
+  })
+
+  it('emits "connect" only with a successful connection', function (done) {
+    const pool = new Pool({
+      // This client will always fail to connect
+      Client: mockClient({
+        connect: function (cb) {
+          process.nextTick(() => {
+            cb(new Error('bad news'))
+            setImmediate(done)
+          })
+        }
+      })
+    })
+    pool.on('connect', function () {
+      throw new Error('should never get here')
+    })
+    return pool.connect().catch(e => expect(e.message).to.equal('bad news'))
+  })
+
+  it('emits acquire every time a client is acquired', function (done) {
+    const pool = new Pool()
+    let acquireCount = 0
+    pool.on('acquire', function (client) {
+      expect(client).to.be.ok()
+      acquireCount++
+    })
+    for (let i = 0; i < 10; i++) {
+      pool.connect(function (err, client, release) {
+        if (err) return done(err)
+        release()
+      })
+      pool.query('SELECT now()')
+    }
+    setTimeout(function () {
+      expect(acquireCount).to.be(20)
+      pool.end(done)
+    }, 100)
+  })
+
+  it('emits error and client if an idle client in the pool hits an error', function (done) {
+    const pool = new Pool()
+    pool.connect(function (err, client) {
+      expect(err).to.equal(undefined)
+      client.release()
+      setImmediate(function () {
+        client.emit('error', new Error('problem'))
+      })
+      pool.once('error', function (err, errClient) {
+        expect(err.message).to.equal('problem')
+        expect(errClient).to.equal(client)
+        done()
+      })
+    })
+  })
+})
+
+function mockClient (methods) {
+  return function () {
+    const client = new EventEmitter()
+    Object.assign(client, methods)
+    return client
+  }
+}