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Slow tests can slow down your development process. Using parallel_tests, you can speed up your test suite by multiple threads and running the tests in groups.
Factory Bot is a fixtures replacement which can generate the needed records directly in the tests. Faker can be used to create fake data for these records.
Create Acceptance Tests or Feature Tests to extend your automated tests with browser testing. It can help tests some areas that cannot be reached with other types of tests.
Using RSpec, learn how to create tests for your application and view your coverage.
Using the Rails 5.1.X defaults, we have a look at what is configured and explore the different types of tests; using the provided MiniTest and Capybara.