migrate from underscore to lodash

test/load/js/loadTest.js

@@ -13,7 +13,7 @@ const request = require('request')
 const Settings = require('settings-sharelatex')
 const async = require('async')
 const fs = require('fs')
-const _ = require('underscore')
+const _ = require('lodash')
 const concurentCompiles = 5
 const totalCompiles = 50
 

test/unit/js/DockerRunnerTests.js

@@ -70,7 +70,8 @@ describe('DockerRunner', function() {
             return runner(callback)
           }
         }
-      }
+      },
+      globals: { Math } // used by lodash
     })
     this.Docker = Docker
     this.getContainer = Docker.prototype.getContainer

test/unit/js/OutputFileOptimiserTests.js

@@ -30,7 +30,8 @@ describe('OutputFileOptimiser', function() {
         child_process: { spawn: (this.spawn = sinon.stub()) },
         'logger-sharelatex': { log: sinon.stub(), warn: sinon.stub() },
         './Metrics': {}
-      }
+      },
+      globals: { Math } // used by lodash
     })
     this.directory = '/test/dir'
     return (this.callback = sinon.stub())