const expect = require('expect.js')
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const co = require('co')
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const _ = require('lodash')
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const describe = require('mocha').describe
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const it = require('mocha').it
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const Pool = require('../')
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describe('pool size of 1', () => {
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it('can create a single client and use it once', co.wrap(function * () {
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const pool = new Pool({ max: 1 })
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expect(pool.waitingCount).to.equal(0)
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const client = yield pool.connect()
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const res = yield client.query('SELECT $1::text as name', ['hi'])
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expect(res.rows[0].name).to.equal('hi')
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client.release()
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pool.end()
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}))
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it('can create a single client and use it multiple times', co.wrap(function * () {
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const pool = new Pool({ max: 1 })
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expect(pool.waitingCount).to.equal(0)
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const client = yield pool.connect()
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const wait = pool.connect()
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expect(pool.waitingCount).to.equal(1)
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client.release()
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const client2 = yield wait
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expect(client).to.equal(client2)
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client2.release()
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return yield pool.end()
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}))
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it('can only send 1 query at a time', co.wrap(function * () {
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const pool = new Pool({ max: 1 })
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// the query text column name changed in PostgreSQL 9.2
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const versionResult = yield pool.query('SHOW server_version_num')
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const version = parseInt(versionResult.rows[0].server_version_num, 10)
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const queryColumn = version < 90200 ? 'current_query' : 'query'
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const queryText = 'SELECT COUNT(*) as counts FROM pg_stat_activity WHERE ' + queryColumn + ' = $1'
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const queries = _.times(20, () =>
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pool.query(queryText, [queryText]))
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const results = yield Promise.all(queries)
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const counts = results.map(res => parseInt(res.rows[0].counts, 10))
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expect(counts).to.eql(_.times(20, i => 1))
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return yield pool.end()
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}))
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})
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