[Codelab Issue] Testing Codelab 5.1, Step 8 - Broken link of robolectric library

[woong]

[Problem]
Robolectric library (robolectricVersion = '4.3.1') is not downloaded.
The version is exactly from 'android-testing-end_codelab_1' project file.
So I went directly to the url which is mentioned in Android Studio 'Run' category.
It says "Directory listing forbidden".

In which lesson and step of the codelab can this issue be found?
In 5.1, Step 8

How to reproduce?
What are the exact steps to reproduce the problem?
Just run TasksViewModelTest.class testCode

Versions

1. What version of Android Studio are you using?
   4.1.2

Additional information
N/A

codelab: advanced-android-kotlin