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TDD and BDD

TDD (Test-Driven Development) involves writing tests before writing the actual code. This helps ensure that the codebase remains testable, reliable, and maintainable, driving the implementation to fulfill the specified requirements.

Behavior-Driven Development (BDD) is a methodology that emphasizes collaboration between technical and non-technical stakeholders, focusing on describing the behavior of the system in a natural language format before implementation.

Well known commands, methods

  • describe(): Organizes tests into a logical group, providing a higher-level structure for test suites.
  • it(): Defines an individual test case or specification within a test suite.
  • expect(): Asserts conditions in tests, specifying the expected outcomes.
  • should(): A BDD-style assertion method used for expressing expected behavior in tests.
  • assert(): Validates conditions in tests, typically used in TDD. Built-in NodeJS method.

Frameworks:

  • Jasmine, Mocha, CHai, Jest, supertest
  • supertest is a library rather than a full-fledged testing framework. It is specifically designed for making HTTP assertions and testing APIs. supertest is often used in conjunction with testing frameworks like Mocha or Jest to facilitate the testing of HTTP endpoints in web applications.

e2e (as BDD superset) Notes:

  • Cypress and TestCafe are end-to-end testing frameworks rather than assertion libraries.
  • In the context of BDD (Behavior-Driven Development), end-to-end testing can be considered a superset or an extension of BDD principles. BDD emphasizes collaboration between technical and non-technical stakeholders to define and understand the behavior of the system. End-to-end tests, by their nature, validate the behavior of the entire application from the user's perspective.
  • While BDD can be applied at various levels (unit tests, integration tests, etc.), end-to-end testing often aligns well with BDD principles due to its focus on high-level behaviors, user interactions, and expected outcomes. In BDD terms, end-to-end tests contribute to describing and ensuring the correctness of the overall system behavior.