fix eslint problems

Author: niieani

test/Compiler-caching.test.js

@@ -1,4 +1,4 @@
-/* globals describe, it, before, after */
+/* globals describe, it */
 "use strict";
 
 const path = require("path");

test/WatchDetection.test.js

@@ -1,6 +1,6 @@
 "use strict";
 
-/*globals describe it before after  */
+/*globals describe it */
 const path = require("path");
 const fs = require("fs");
 const MemoryFs = require("memory-fs");

test/WatcherEvents.test.js

@@ -1,6 +1,6 @@
 "use strict";
 
-/*globals describe it before after  */
+/* globals describe it */
 const path = require("path");
 const MemoryFs = require("memory-fs");
 const webpack = require("../");