Supply Chain Security
In February 2021, security researcher Alex Birsan compromised 35 major companies — including Apple, Microsoft, PayPal, and Tesla — using a technique called dependency confusion. He uploaded malicious packages to public registries with the same names as internal private packages, then watched as the build systems of major corporations automatically downloaded and
Load Testing
Running load tests manually after every deployment is a discipline that erodes over time.
playwright
Component tests that hit real APIs are integration tests wearing a costume.
Testing
The Pareto principle doesn't care about your opinion of the codebase. In most software systems, roughly 20% of modules contain roughly 80% of the defects.
Security Testing
Web applications are the front door to your business. They handle user data, process payments, manage authentication, and connect to your most sensitive infrastructure. That makes them a prime target for attackers — and the reason penetration testing has become a non-negotiable part of any serious security program. This guide
Testing Tools
Production applications generate errors constantly. Most of them are noise — bots hitting 404s, occasional network timeouts, browser extensions injecting malformed scripts. A small subset are real bugs that affect real users and need to be fixed. The challenge is separating signal from noise efficiently. Bugsnag was designed to solve this
Ruby
RSpec is the dominant testing framework in the Rails ecosystem. Its BDD-style syntax encourages you to write tests that read like specifications, which makes test failures easier to diagnose and test suites easier to navigate. This tutorial walks through everything you need to get RSpec working well in a
Ruby
Test doubles let you isolate the unit under test by replacing collaborators with controlled stand-ins. RSpec ships with a full mocking library — no extra gems needed. This guide covers everything from basic stubs to strict message expectations. The Four Types of Test Doubles Type Purpose Double Pure stand-in
Test Automation
Running your entire test suite on every commit is safe but slow. A 45-minute test run discourages frequent commits, creates a bottleneck in CI, and provides little additional safety over a well-selected subset of tests. Delta testing — also called change-based testing or test impact analysis — runs only
Ruby Testing
Mocking and stubbing are how you isolate the thing you're testing from everything it depends on. Without them, a unit test that touches a database, an external API, or a slow service stops being a unit test — it becomes an integration test wearing a unit test costume. RSpec
Testing
Delta Lake adds ACID transactions, time travel, and schema enforcement to Apache Spark data lakes. These features introduce behaviors that require specific testing: concurrent writes must not corrupt data, time travel must return correct historical snapshots, schema changes must follow defined rules. This guide covers how to test Delta Lake
Test Automation
Testing a DeFi protocol is unlike testing any other software. Your contract interacts with Uniswap liquidity pools, Chainlink price oracles, Aave lending markets, and Compound interest rate models—all live, all changing, all outside your control. A naive implementation collapses when prices move, fails when pools are illiquid, or gets