* Extracted sub-matchers for the two major existing strategies
(matching all errors, and matching by type and/or message)
* Reduced the use of mutable state
This enables some useful simplifications at the cost of making it
impossible (for now) to expect a function to throw an error with a falsy
message.
[#20622765]
By deferring the evaluation of these messages, we can avoid the
expensive creation of them when in the majority use case (tests are
passing) they are not needed.
These failure messages were causing performance problems with larger
objects needed to be pretty printed as discussed in #520 and brought up
by @rdy.
[fixes#65925900][fixes#520]
- included what was thrown for failure messages in toThrow and toThrowError
- fixed typo from 'execption' to 'exception' in toThrowError failure messages
- clarified failure messages in toThrowError to include specific error types
[Fixes#52680709]
since the passed in errorType could be a custom user function,
we instead detect if its an instanceof Error by using a Surrogate
(inspired by Backbone's use of surrogacy)
- It still supports no expected, which means that something was thrown
- Expected value is now tested via equality in order to pass
Adding toThrowError:
- toThrowError() passes if an Error type was thrown
- toThrowError(String) & toThrowError(RegExp) compare Expected to the Error message
- toThrowError(Error constructor) compares Expected to the constructor of what was thrown
- toThrowError(Error constructor, String) & toThrowError(Error constructor, RegExp) compares both the Error and the message
Also, equality now handles Errors, enforcing the message as part of the equality.
