fix: copy over rspec context to reactor thread #22
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We were running into some issues using async-rspec in specs that were trying to access spec metadata.
In our case, we're using a rspec-snapshot to let us match against snapshots, which uses the spec metadata to construct a directory path to load snapshots from. When we initialize said matcher in a spec example running inside the reactor, that metadata is nil, since it's stored as a thread-local variable.
The workaround here is just copying over the RSpec thread-local variables into the reactor block.
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