metalsmith / layouts

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fix `assert.rejects` usage in tests

`assert.rejects` needs to be awaited inside of the async test body
if it is not the test is effectively ignored since any exceptions are
thrown after the test function completes

other changes:
- `transform` option is required by plugin
- wrapping a Promise returned by `Metalsmith` invocation is not
  necessary: `assert.rejects` takes a Promise as first argument

see:
https://nodejs.org/api/assert.html#assertrejectsasyncfn-error-message

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