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

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+const expect = require('expect.js')
+const co = require('co')
+const _ = require('lodash')
+
+const describe = require('mocha').describe
+const it = require('mocha').it
+
+const Pool = require('../')
+
+describe('pool size of 1', () => {
+  it('can create a single client and use it once', co.wrap(function * () {
+    const pool = new Pool({ max: 1 })
+    expect(pool.waitingCount).to.equal(0)
+    const client = yield pool.connect()
+    const res = yield client.query('SELECT $1::text as name', ['hi'])
+    expect(res.rows[0].name).to.equal('hi')
+    client.release()
+    pool.end()
+  }))
+
+  it('can create a single client and use it multiple times', co.wrap(function * () {
+    const pool = new Pool({ max: 1 })
+    expect(pool.waitingCount).to.equal(0)
+    const client = yield pool.connect()
+    const wait = pool.connect()
+    expect(pool.waitingCount).to.equal(1)
+    client.release()
+    const client2 = yield wait
+    expect(client).to.equal(client2)
+    client2.release()
+    return yield pool.end()
+  }))
+
+  it('can only send 1 query at a time', co.wrap(function * () {
+    const pool = new Pool({ max: 1 })
+    const queries = _.times(20, (i) => {
+      return pool.query('SELECT COUNT(*) as counts FROM pg_stat_activity')
+    })
+    const results = yield Promise.all(queries)
+    const counts = results.map(res => parseInt(res.rows[0].counts), 10)
+    expect(counts).to.eql(_.times(20, i => 1))
+    return yield pool.end()
+  }))
+})