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The reason for restricting nesting is presumably to flag complex test setups
that indicate a smell in the tested code. Three levels are
allowed
to accomodate this common style:
My experience has been that a slightly more complex setup in a Rails
application (particularly for model and controller specs) is more a fact of life
than a code smell. Four levels accommodates code like:
Using my current application as a gague, my sense is that the additional level
of nesting addresses the common cases.