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For instance, the acceptance test above requires a log in routine. Here's where the expressive power of a DSL like Capybara manifests:
If the application has an UI, acceptance tests should cover it; otherwise, we're not really testing the path end users experience. The test layer must then include a window driver that knows how to operate the UI, like clicking buttons, filling fields, and parsing the results. In this category we have libraries such as Puppeteer, Cypress, and Selenium.
If the application has an UI, acceptance tests should cover it; otherwise, we're not really testing the path end users experience. The test layer must then include a window driver that knows how to operate the UI, like clicking buttons, filling fields, and parsing the results. In this category we have libraries such as Puppeteer, Cypress, and Selenium.
If the acceptance criteria layer focuses on building the right things, then the implementation layer is about building them right. Here is where we find Test-Driven Development (TDD) frameworks like JUnit, Mocha, or RSpec, of which many employ a Domain Specific Language (DSL) to map the conditions and actions in the acceptance layer into executable code. The test layer function is to evaluate the pre-conditions, execute the actions, and compare the outputs.