API Reference Expect v#3.1.0

Expect allows you to write simple, clear assertions in your unit tests.

A matcher is responsible for providing expect/2 three things

You are highly encouraged to implement your own custom matchers. For the application you will build, there will surely be some interesting properties and shapes of data that will be important to verify. It might be easy to use the equal() matcher for 99% of assertions, but writing a higher-level matcher can be much more intent revealing.

Custom matchers should return this when they receive data they cannot handle

Custom matchers should return this in their happy path. Use the succeeded? field to indicate whether its condition is true or false