Fix unit tests

Author: christophetd

test/unit/lib/JobTest.js

@@ -1,3 +1,5 @@
+"use strict";
+
 const expect = require('chai').expect
 const sinon = require('sinon')
 const proxyquire = require('proxyquire').noCallThru()
@@ -57,4 +59,4 @@ describe('Job', () => {
 
     expect(job.cb()).to.deep.equal(mocks['lodash'].noop())
   })
-})
+})

test/unit/lib/PoolManagerTest.js

@@ -1,3 +1,5 @@
+"use strict";
+
 const expect = require('chai').expect
 const sinon = require('sinon')
 const proxyquire = require('proxyquire').noCallThru()
@@ -660,4 +662,4 @@ describe('PoolManager', () => {
   })
 
 
-})
+})