Regex in RSpec Argument Matchers

Today I learned you can use regular expressions in RSpec method argument expectations.

Suppose I have a method that takes an email, and a registered boolean as parameters:

def some_method(email:, registered:)
end

In a spec, it's easy enough to verify that it was called with set parameters, like test@example.com and true:

expect(subject)
  .to receive(:some_method)
  .with(email: 'test@example.com', registered: true)

But what if I want to verify that the email address just belongs to example.com? We can use a regex for that!

expect(subject)
  .to receive(:some_method)
  .with(email: /@example.com$/, registered: true)

Today I Learned