Show exception stack traces in tests

[abrooksv]

Testing

Before:

  Test setUpClass FAILED

  java.net.UnknownHostException: repo.labs.intellij.net

After:

  Test setUpClass FAILED

  java.net.UnknownHostException: repo.labs.intellij.net
      at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)
      at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
      at java.net.Socket.connect(Socket.java:589)
      at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
      at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
      at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)

Screenshots (if appropriate)

Checklist

• I have read the README document
• I have read the CONTRIBUTING document
• Local run of gradlew check succeeds
• My code follows the code style of this project
• I have added tests to cover my changes
• All new and existing tests passed
• A short description of the change has been added to the CHANGELOG

License

I confirm that my contribution is made under the terms of the Apache 2.0 license.