Improved OpeningHandshakeRejection test

[marci4]

Also removed assert() in WebSocketClient runnable since it has no
understandable purpose!

Description

Removed assert() in WebSocketClientRunnable
Improved OpeningHandshakeRejection test

Related Issue

Motivation and Context

Cleanup

How Has This Been Tested?

Standard JUnit-Tests

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.