Use snapshot testing for inspection and error checking

[sunesimonsen]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 1150

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 93.463%

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Totals
Change from base Build 1141:	0.0%
Covered Lines:	654
Relevant Lines:	683

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💛 - Coveralls

[alexjeffburke]

This looks pretty cool - I might be tempted to separate the use of template strings into a plain commit on master and then introduce the assertion changes separately.

Ultimately if the -snapshot plugin API is stable enough to be used and make other plugins dependent upon then lets try this.

[sunesimonsen]

@alexjeffburke there is really no danger to this change. You can just search replace s/ snapshot// and switch to use https://github.com/gustavnikolaj/string-utils instead of expect.unindent.

[alexjeffburke]

@sunesimonsen happy that we proceed! And to be fair we probably need some -snapshot mileage somewhere we know would benefit from it :)

[papandreou]

This looks great! 🚀