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

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+'use strict'
+const expect = require('expect.js')
+const _ = require('lodash')
+
+const describe = require('mocha').describe
+const it = require('mocha').it
+
+const Pool = require('../')
+
+describe('pool', function () {
+  describe('with callbacks', function () {
+    it('works totally unconfigured', function (done) {
+      const pool = new Pool()
+      pool.connect(function (err, client, release) {
+        if (err) return done(err)
+        client.query('SELECT NOW()', function (err, res) {
+          release()
+          if (err) return done(err)
+          expect(res.rows).to.have.length(1)
+          pool.end(done)
+        })
+      })
+    })
+
+    it('passes props to clients', function (done) {
+      const pool = new Pool({ binary: true })
+      pool.connect(function (err, client, release) {
+        release()
+        if (err) return done(err)
+        expect(client.binary).to.eql(true)
+        pool.end(done)
+      })
+    })
+
+    it('can run a query with a callback without parameters', function (done) {
+      const pool = new Pool()
+      pool.query('SELECT 1 as num', function (err, res) {
+        expect(res.rows[0]).to.eql({ num: 1 })
+        pool.end(function () {
+          done(err)
+        })
+      })
+    })
+
+    it('can run a query with a callback', function (done) {
+      const pool = new Pool()
+      pool.query('SELECT $1::text as name', ['brianc'], function (err, res) {
+        expect(res.rows[0]).to.eql({ name: 'brianc' })
+        pool.end(function () {
+          done(err)
+        })
+      })
+    })
+
+    it('passes connection errors to callback', function (done) {
+      const pool = new Pool({ port: 53922 })
+      pool.query('SELECT $1::text as name', ['brianc'], function (err, res) {
+        expect(res).to.be(undefined)
+        expect(err).to.be.an(Error)
+        // a connection error should not polute the pool with a dead client
+        expect(pool.totalCount).to.equal(0)
+        pool.end(function (err) {
+          done(err)
+        })
+      })
+    })
+
+    it('does not pass client to error callback', function (done) {
+      const pool = new Pool({ port: 58242 })
+      pool.connect(function (err, client, release) {
+        expect(err).to.be.an(Error)
+        expect(client).to.be(undefined)
+        expect(release).to.be.a(Function)
+        pool.end(done)
+      })
+    })
+
+    it('removes client if it errors in background', function (done) {
+      const pool = new Pool()
+      pool.connect(function (err, client, release) {
+        release()
+        if (err) return done(err)
+        client.testString = 'foo'
+        setTimeout(function () {
+          client.emit('error', new Error('on purpose'))
+        }, 10)
+      })
+      pool.on('error', function (err) {
+        expect(err.message).to.be('on purpose')
+        expect(err.client).to.not.be(undefined)
+        expect(err.client.testString).to.be('foo')
+        err.client.connection.stream.on('end', function () {
+          pool.end(done)
+        })
+      })
+    })
+
+    it('should not change given options', function (done) {
+      const options = { max: 10 }
+      const pool = new Pool(options)
+      pool.connect(function (err, client, release) {
+        release()
+        if (err) return done(err)
+        expect(options).to.eql({ max: 10 })
+        pool.end(done)
+      })
+    })
+
+    it('does not create promises when connecting', function (done) {
+      const pool = new Pool()
+      const returnValue = pool.connect(function (err, client, release) {
+        release()
+        if (err) return done(err)
+        pool.end(done)
+      })
+      expect(returnValue).to.be(undefined)
+    })
+
+    it('does not create promises when querying', function (done) {
+      const pool = new Pool()
+      const returnValue = pool.query('SELECT 1 as num', function (err) {
+        pool.end(function () {
+          done(err)
+        })
+      })
+      expect(returnValue).to.be(undefined)
+    })
+
+    it('does not create promises when ending', function (done) {
+      const pool = new Pool()
+      const returnValue = pool.end(done)
+      expect(returnValue).to.be(undefined)
+    })
+
+    it('never calls callback syncronously', function (done) {
+      const pool = new Pool()
+      pool.connect((err, client) => {
+        if (err) throw err
+        client.release()
+        setImmediate(() => {
+          let called = false
+          pool.connect((err, client) => {
+            if (err) throw err
+            called = true
+            client.release()
+            setImmediate(() => {
+              pool.end(done)
+            })
+          })
+          expect(called).to.equal(false)
+        })
+      })
+    })
+  })
+
+  describe('with promises', function () {
+    it('connects, queries, and disconnects', function () {
+      const pool = new Pool()
+      return pool.connect().then(function (client) {
+        return client.query('select $1::text as name', ['hi']).then(function (res) {
+          expect(res.rows).to.eql([{ name: 'hi' }])
+          client.release()
+          return pool.end()
+        })
+      })
+    })
+
+    it('executes a query directly', () => {
+      const pool = new Pool()
+      return pool
+        .query('SELECT $1::text as name', ['hi'])
+        .then(res => {
+          expect(res.rows).to.have.length(1)
+          expect(res.rows[0].name).to.equal('hi')
+          return pool.end()
+        })
+    })
+
+    it('properly pools clients', function () {
+      const pool = new Pool({ poolSize: 9 })
+      const promises = _.times(30, function () {
+        return pool.connect().then(function (client) {
+          return client.query('select $1::text as name', ['hi']).then(function (res) {
+            client.release()
+            return res
+          })
+        })
+      })
+      return Promise.all(promises).then(function (res) {
+        expect(res).to.have.length(30)
+        expect(pool.totalCount).to.be(9)
+        return pool.end()
+      })
+    })
+
+    it('supports just running queries', function () {
+      const pool = new Pool({ poolSize: 9 })
+      const text = 'select $1::text as name'
+      const values = ['hi']
+      const query = { text: text, values: values }
+      const promises = _.times(30, () => pool.query(query))
+      return Promise.all(promises).then(function (queries) {
+        expect(queries).to.have.length(30)
+        return pool.end()
+      })
+    })
+
+    it('recovers from query errors', function () {
+      const pool = new Pool()
+
+      const errors = []
+      const promises = _.times(30, () => {
+        return pool.query('SELECT asldkfjasldkf')
+          .catch(function (e) {
+            errors.push(e)
+          })
+      })
+      return Promise.all(promises).then(() => {
+        expect(errors).to.have.length(30)
+        expect(pool.totalCount).to.equal(0)
+        expect(pool.idleCount).to.equal(0)
+        return pool.query('SELECT $1::text as name', ['hi']).then(function (res) {
+          expect(res.rows).to.eql([{ name: 'hi' }])
+          return pool.end()
+        })
+      })
+    })
+  })
+})