This spec was introduced back in 18c562a1e6, at which point it was
testing that the to_create block got passed to a proxy object.
A lot has changed since then, and this test is no longer testing
anything involving to_create (we can remove the call to to_create and it
still passes). It is testing that we instantiate a strategy and pass an
evaluation to it, but that isn't a helpful test. The behavior we
actually care about is well tested in acceptance specs.
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