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Updating from previous versions

If you are upgrading from previous versions, then there are some subtle changes that you should be aware of. Do you see a change that is not listed in this document? Then please open an issue to add it.

Spec DSL

The describe block should be passed the actual constant and not a string of the constant's name. This works:

describe WidgetsController do

But this does not:

describe "WidgetsController" do

If you want to pass a string, then you must provide an additional description to tell the Spec DSL what test class to use:

describe "WidgetsController", :controller do

Expectations

The signature for the expectation must_change has changed from earlier versions of minitest-rails. This is because the expectation used to refer to the assert_difference assertion, but not refers to the assert_changes assertion added in Rails 5.1. The expectation for the assert_difference assertion is now must_differ.

Versioning

The minitest-rails gem now follows Rails versioning. This means minitest-rails 6.0.x works for rails 6.0.x, and minitest-rails 6.1.x will work for rails 6.1.x.