Test utility for validating blocks

Description

It would be very convenient if this library including a utility for validating blocks. Inside of our tests, we could produce blocks and run them through this utility, which would return true if the block is valid or false otherwise. Currently, blocks are a bit brittle in that changes to block structure can produce errors which can only be debugged interactively through a dummy Slack channel. I don't know what this would involve, but it would be a great feature.

What type of issue is this? (place an x in one of the [ ])

• bug
• enhancement (feature request)
• question
• documentation related
• example code related
• testing related
• discussion

Requirements (place an x in each of the [ ])

• 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.
• I've searched for any related issues and avoided creating a duplicate issue.

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Actual result:

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The issue names no files, tests, or entry points, so first review the surrounding discussion and locate the library's existing block-related code. Define what makes a produced block valid and how the utility should report failures; done means tests can use it to receive true or false without relying on a dummy Slack channel.