[TS 4.4] Expand test coverage for HTTPReceiver

[filmaj]

Summary

Issuing this pull request in the quest to support newer TS version. This simply expands the test coverage a bit for HTTPReceiver. The intention is to merge this into @srajiang's active PR adding new TS support in #1091.

• Split HTTPReceiver request tests into own describe block
• Add a test for invoking the installRedirectHandler

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[seratch]

This is a good addition 👍

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (ts-4.4@90081bd). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head 75b34ba differs from pull request most recent head 0555bc9. Consider uploading reports for the commit 0555bc9 to get more accurate results

@@            Coverage Diff            @@
##             ts-4.4    #1094   +/-   ##
=========================================
  Coverage          ?   71.03%           
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  Files             ?       13           
  Lines             ?     1229           
  Branches          ?      365           
=========================================
  Hits              ?      873           
  Misses            ?      287           
  Partials          ?       69           

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