A task used to verify the runtime environment.

Use it like this:

mix knot.ensure_sanity

You should then see a bunch of hashes. Those are in fact blocks being mined using a very low difficulty. After mining 128 blocks on top of the genesis sample block, you should see a message saying something like this:

20:41:46.889 [info]  All test passed.

This means that the 129th block in the chain has the expected properties and fields, and a node running on this machine would behave correctly.