Put invalid pubsub messages into e2e streaming test

[mkuthan]

Closes #91 and #110

[codecov]

Codecov Report

Merging #113 (2c8b680) into main (b0b888c) will not change coverage.
The diff coverage is n/a.

❗ Current head 2c8b680 differs from pull request most recent head 82e4ca6. Consider uploading reports for the commit 82e4ca6 to get more accurate results

@@            Coverage Diff            @@
##               main     #113   +/-   ##
=========================================
  Coverage     58.53%   58.53%           
  Complexity      110      110           
=========================================
  Files            86       86           
  Lines          1213     1213           
  Branches        154      154           
=========================================
  Hits            710      710           
  Misses          413      413           
  Partials         90       90           

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