use a while loop for better readability, reduce interval to 200ms

Author: danielrentz

lib/helper/FileSystem.js

@@ -86,9 +86,10 @@ class FileSystem extends Helper {
     if (sec === 0) assert.fail('Use `seeFile` instead of waiting 0 seconds!')
     this.file = path.join(this.dir, name)
     this.debugSection('File', this.file)
-    for (const t = Date.now() + sec * 1000; !fileExists(this.file); ) {
-      if (t < Date.now()) throw new Error(`file (${name}) still not present in directory ${this.dir} after ${sec} sec`)
-      await new Promise(resolve => setTimeout(resolve, 500))
+    const endTime = Date.now() + sec * 1000
+    while (!fileExists(this.file)) {
+      if (endTime < Date.now()) throw new Error(`file (${name}) still not present in directory ${this.dir} after ${sec} sec`)
+      await new Promise(resolve => setTimeout(resolve, 200))
     }
   }