Testing Airflow DAGs: A Comprehensive Guide
Unit test tasks, validate DAG structure, mock external services, and build CI/CD pipelines for Airflow. Prevent silent data loss with systematic testing.
·13 min read · #airflow#testing#pytest
#testing
68 posts · page 1 of 2
Data Pipeline Testing — Catching Bugs Before They Hit Production
Learn the data testing pyramid, unit testing transformations, contract testing between stages, and how to build reliable CI/CD test suites for pipelines.
·11 min read · #data-engineering#testing#data-quality
GitHub Actions Matrix Builds: Parallel Testing at Scale
Master GitHub Actions matrix strategies with fail-fast control, dynamic matrices from scripts, include/exclude rules, and real-world multi-platform testing patterns.
·7 min read · #cicd#github-actions#matrix-builds
GraphQL Testing Strategies
Test GraphQL APIs effectively with unit tests for resolvers, integration tests against the schema, and end-to-end mocking strategies.
·9 min read · #graphql#testing#jest
Prompt Evaluation: Measuring and Improving Quality
Learn how to measure prompt quality with evaluation datasets, scoring rubrics, A/B testing, and automated grading to iterate on prompts with evidence.
·9 min read · #prompt-engineering#evaluation#ai
Chaos Engineering: Test Your System's Resilience
Learn chaos engineering principles and tools. Run controlled experiments with Chaos Monkey, Litmus, and Gremlin to find weaknesses before they cause real outages.
·8 min read · #devops#chaos-engineering#resilience
Python Testing with pytest: Fixtures, Marks, and Plugins
Master pytest from fixtures and parametrize to marks, plugins, and CI integration. Write fast, maintainable Python tests with practical examples.
·9 min read · #python#pytest#testing
Integration Testing: Test Real Dependencies, Not Mocks
Learn how to write effective integration tests that verify real database queries, API calls, and service interactions using testcontainers and proper test infrastructure.
·8 min read · #testing#integration-testing#testcontainers
Performance Testing: Load, Stress, and Spike Testing
Learn load testing, stress testing, and spike testing with k6 and Locust. Includes test scripts, result interpretation, and strategies for finding bottlenecks.
·9 min read · #testing#performance#load-testing
Test-Driven Development (TDD): A Practical Guide
Learn the TDD workflow with real examples in Python and JavaScript. Covers red-green-refactor, when TDD works best, and how to handle common challenges.
·9 min read · #testing#tdd#test-driven-development
Automated Testing in CI/CD: Unit, Integration, and E2E
Structure automated tests in your CI/CD pipeline — unit, integration, and end-to-end testing strategies, parallel execution, and failure handling.
·5 min read · #cicd#testing#automation
REST API Testing: Postman, curl, and Automated Tests
Learn to test REST APIs manually with Postman and curl, then automate with Jest and Supertest. Covers status codes, response validation, and CI integration.
·7 min read · #rest#api#testing
React Testing Library: Complete Testing Guide
Learn to test React components with React Testing Library. Covers rendering, user events, async testing, mocking, and accessibility-driven queries.
·7 min read · #react#testing#react-testing-library
Python Mocking with unittest.mock: Complete Guide
Master Python's unittest.mock library for testing. Learn Mock, MagicMock, patch, side_effect, and spec with real-world examples for unit testing.
·8 min read · #python#testing#mocking
Jest vs Vitest: JavaScript Test Runners Compared
Compare Jest and Vitest for JavaScript testing. Understand speed, configuration, compatibility, and migration tradeoffs to pick the right test runner.
·8 min read · #jest#vitest#testing
Testing FastAPI Apps with TestClient and Pytest Fixtures
Build a robust test suite for FastAPI with TestClient, pytest fixtures, dependency overrides, and async testing patterns.
·6 min read · #fastapi#testing#pytest
Dependency Injection Patterns in Go
Learn practical dependency injection in Go using interfaces, constructor injection, and functional options without heavy frameworks.
·6 min read · #go#dependency-injection#design-patterns
Go Fuzz Testing Tutorial
Write fuzz tests in Go to discover edge cases and bugs automatically. Learn the fuzzing API, corpus management, and fixing found crashes.
·6 min read · #go#fuzzing#testing
E2E Testing Next.js Apps with Playwright
Set up Playwright for end-to-end testing of Next.js applications. Covers configuration, writing tests, handling auth, and CI integration.
·7 min read · #nextjs#playwright#testing
Node.js Built-in Test Runner: A Complete Guide to node:test
Learn how to use the native Node.js test runner with no external dependencies. Covers test organization, mocking, snapshots, and code coverage.
·6 min read · #nodejs#testing#node-test
Dependency Injection in Python Without a Framework
Learn how to apply dependency injection in Python using constructor injection, factory functions, and simple containers -- no framework required.
·5 min read · #python#dependency-injection#architecture
Advanced pytest Patterns for Real-World Projects
Master pytest fixtures, parametrize, monkeypatch, and custom markers to write maintainable, expressive tests for production Python code.
·4 min read · #python#pytest#testing
React Testing Library: Advanced Patterns for Complex UIs
Advanced testing patterns with React Testing Library including custom render wrappers, async flows, portals, context-heavy components, and integration testing.
·7 min read · #react#testing#react-testing-library
WCAG Compliance Auditing and Automated Testing
Audit your site for WCAG 2.2 compliance using automated tools, manual testing checklists, and CI integration. Covers axe-core, Lighthouse, screen reader testing, and remediation.
·6 min read · #accessibility#wcag#testing
Contract Testing with Pact for Microservices
Learn how Pact contract testing catches integration bugs between microservices without needing a full end-to-end environment.
·8 min read · #testing#pact#contract-testing
API Testing with Supertest and Jest
Learn how to write fast, reliable API tests for Express and Node.js backends using Supertest and Jest.
·7 min read · #testing#supertest#jest
Chaos Engineering: Principles and First Experiments
Learn chaos engineering fundamentals and run your first experiments to build confidence in your system's resilience.
·8 min read · #testing#chaos-engineering#resilience
Load Testing with k6 for Performance
Learn how to write and run load tests with k6 to find performance bottlenecks before your users do.
·7 min read · #testing#k6#load-testing
Mutation Testing: Measuring Test Suite Quality
Learn how mutation testing works, why code coverage alone is misleading, and how to use tools like Stryker and mutmut to find weak tests.
·7 min read · #testing#mutation-testing#quality
Property-Based Testing with Hypothesis in Python
Learn property-based testing with Hypothesis to find edge cases your example-based tests miss and write more robust Python code.
·6 min read · #testing#python#hypothesis
Snapshot Testing: Patterns and Anti-Patterns
Learn when snapshot tests help, when they hurt, and how to use them effectively in React, API, and configuration testing.
·7 min read · #testing#snapshot-testing#jest
TDD Workflow with a Real-World Example
Walk through the red-green-refactor cycle step by step, building a password validator to learn practical test-driven development.
·8 min read · #testing#tdd#test-driven-development
Mocks, Stubs, Spies, and Fakes Compared
Understand the differences between test doubles: mocks, stubs, spies, and fakes, with practical examples in JavaScript and Python.
·7 min read · #testing#mocking#test-doubles
Visual Regression Testing with Playwright
Catch unintended UI changes automatically by comparing screenshots with Playwright's built-in visual comparison tools.
·7 min read · #testing#playwright#visual-regression
Table-Driven Tests and Test Helpers in Go
Write clear, maintainable Go tests using table-driven patterns, test helpers, subtests, and cleanup functions.
·7 min read · #go#testing#best-practices
Testing Custom React Hooks with renderHook
Learn how to test custom React hooks using renderHook from React Testing Library, covering state, effects, async behavior, and context.
·6 min read · #react#testing#hooks
Testing Strategies in Go
Write effective Go tests — table-driven tests, subtests, test helpers, mocking with interfaces, benchmarks, and integration testing patterns.
·4 min read · #go#testing#intermediate
Node.js Native Test Runner
Learn to write tests with Node.js built-in test runner. Covers test organization, assertions, mocking, subtests, code coverage, and watch mode.
·7 min read · #nodejs#testing#intermediate
End-to-End Testing with Cypress
Write reliable E2E tests with Cypress — selectors, assertions, network stubbing, custom commands, and CI integration.
·4 min read · #testing#cypress#intermediate
Integration Tests vs Unit Tests: Finding the Right Balance
Understand the tradeoffs between unit tests and integration tests. Learn the testing pyramid, trophy, and practical strategies for effective test suites.
·7 min read · #testing#strategy#intermediate
Mocking Strategies for Unit Tests
Learn when and how to mock dependencies in unit tests. Covers stubs, spies, fakes, mock patterns, and how to avoid over-mocking.
·7 min read · #testing#mocking#intermediate
pytest Fixtures: A Complete Guide
Master pytest fixtures for reusable test setup and teardown. Covers scopes, parameterization, factories, autouse, and fixture composition.
·6 min read · #testing#pytest#intermediate
Testing React Components with Testing Library
Learn to test React components the right way with React Testing Library. Covers rendering, queries, user events, async testing, and best practices.
·7 min read · #testing#react#intermediate
AI Evaluation Frameworks Overview
A practical overview of evaluation frameworks for AI applications: what they measure, how they differ, and how to pick one that matches your workflow.
·4 min read · #ai#evaluation#llm
C++ Unit Testing with GoogleTest
Set up GoogleTest in a CMake project and write clear unit tests with assertions, fixtures, and parameterized tests for confident C++ code.
·4 min read · #cpp#testing#gtest
FastAPI Testing with pytest
Write fast, reliable tests for FastAPI apps using TestClient, pytest fixtures, dependency overrides, and a separate test database.
·3 min read · #fastapi#pytest#testing
Go Testing Package Tutorial
Write effective tests in Go with the standard testing package: table-driven tests, subtests, fixtures, parallelism, benchmarks, and fuzzing.
·4 min read · #go#testing#benchmarks
Go Tooling: go vet, gofmt, and go test
A practical guide to Go's built-in tooling trio: gofmt for formatting, go vet for static checks, and go test for unit, benchmark, and coverage workflows.
·5 min read · #go#golang#tooling