Difference between it_behaves_like and include_examples for shared examples

When implementing DRY test suites in RSpec, shared examples can be integrated into a spec using either it_behaves_like or include_examples. While both methods allow for the reuse of common expectations, they handle the execution context and documentation output differently.

The primary goal is to determine the optimal method for maintaining clean failure traces and readable documentation without sacrificing state isolation. There is uncertainty regarding how the lack of a nested context in include_examples impacts the visibility of the subject and the resulting output in the RSpec documentation formatter.

• Does include_examples impact the isolation of the test state compared to the nested group created by it_behaves_like?
• Which method is more appropriate when the shared examples rely heavily on an implicit subject defined in the parent context?