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Goal: to be able to create BDD-style structured tests with a minimal amount of messing with low-level (and not well documented) XCTest APIs

At the moment, there are the following components:

• A result builder for constructing a test out of Describe, Context, and It elements
• A function body macro that wraps the body in a Describe element and executes it

This enables structured tests using the normal XCTest approach of functions that start with "test".

There are the following limitations:

• Function body macros are awkward to work with because errors, test failures, and breakpoints all have to refer to the macro-generated code
• Logging needs to show which test element a failure occurred in
• Ideally, test elements should show in Xcode's test navigator for easily running specific elements