Add Support for Custom Error Assertion #409
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Today the package provides Assertion helpers for errors of three type:
These assertions are useful, but could be either too broad or too narrow. Having an assertion that is very precise on the error (that returns true to a fully equality comparison) makes tests brittle, having an assertion that matches any error makes it difficult to know that the failure is right one
This PR adds an additional way to match errors through the introduction of
ErrorPredicate