fix: undefined command summary

[pwtyler]

Fixes undefined notice for $command_summary during WP-CLI/Drush execution
This was broken in #2589

https://github.com/pantheon-systems/terminus/pull/2589/files#diff-0940cda3af08922f69b1bf2e6f64c5c9c291135936a398e5303435a82cd234b5L81-L82

[namespacebrian]

I'm a bit confused. I see that $command_summary is no longer set after the previous PR. What confuses me is that this PR looks like it's adding a new assert to a test. i'm unfamiliar with logger->expects() and $this->once(), and whatever object with() is being called on at that point (not sure what method() returns)..

It's a new assert.. so I'm not sure how it'd be putting the command summary back, and if an error is happening because the command summary is null, i'm not sure how adding a new assert to the test would prevent that error...

[namespacebrian]

@kporras07 would probably understand 🙃

[pwtyler]

I'm pretty sure I borked this pushing the wrong branch or something, I don't really recall what the test was supposed to be fore. I was looking at it yesterday because I confused myself. The issue I intended to fix is still present, I'm going to poke at this today.

[pwtyler]

Re-discovered the process above— I added a test and reverted the fix to see it fail, but I expected phpunit to balk at the PHP notice and it didn't.

[pwtyler]

Unit test I wrote doesn't actually run, removed.