Test-driven development guides — write tests first, ship fewer bugs, and design better software.
Testing
Test-driven development (TDD) is shift-left taken to its logical extreme: tests are written before the code they test. This forces quality considerations to happen at specification time — the earliest possible moment. This guide covers the TDD cycle, why it's the most effective shift-left practice available,
Code Coverage
Coverage percentage is a proxy metric. Like most proxy metrics, it becomes counterproductive the moment teams start optimizing for it directly. The problem isn't coverage tools. The problem is treating a measurement of test quantity as a measurement of test quality. You can achieve 100% line coverage with
Testing
Three acronyms — TDD, BDD, ATDD — describe related but distinct practices.
Testing
TDD, BDD, and ATDD are all test-first development approaches, but they differ in scope, audience, and tooling.
Testing
Test-driven development in React is more challenging than server-side TDD, but it's absolutely practical.
Testing
TDD promises better design, faster feedback, and confident refactoring.
Testing
Test-driven development (TDD) is a software development practice where you write tests before writing code. It sounds backwards at first — how can you test something that doesn't exist yet? But once you experience the feedback loop, it's hard to go back. TDD changes how you
Testing
Backend TDD has a straightforward feedback loop: write a test for an endpoint or function, watch it fail, implement the minimum code to pass it.
Testing
Testing React components has a reputation for being awkward. Shallow rendering, mock components, snapshot tests that break on every change — these patterns produce test suites that slow teams down rather than help them. React Testing Library changed this by enforcing a simple rule: test components the way users use them,
Testing
Test-Driven Development has a reputation for being a discipline that sounds great in theory but falls apart under deadline pressure.
Testing
TDD and BDD are often mentioned in the same breath, sometimes used interchangeably, and frequently confused with each other.
Testing
Python and pytest are a natural fit for TDD. pytest has minimal ceremony, excellent error messages, and a parametrize decorator that makes covering edge cases straightforward. This tutorial builds an order pricing engine from scratch using strict red-green-refactor discipline. No implementation code gets written until a test demands