Add expect to injected vars in inline scripts.

[andrewvc]

This also refactors the CLIMock in the cli tests to use a builder pattern to make injecting stdin nicer.

[apmmachine]

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• Start Time: 2021-08-13T19:36:38.728+0000

• Duration: 15 min 28 sec

• Commit: 6d3c0b0

Test stats 🧪

Test	Results
Failed	0
Passed	125
Skipped	0
Total	125

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[andrewvc]

/test