Category: community
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API Regression Testing: Catch Breaking Changes Early
API regression testing re-runs your API tests after every code change so existing endpoints keep returning what clients expect. A solid setup checks response shapes, auth, and latency, mocks external dependencies, and runs a fast suite on each pull request with the full suite nightly. Keploy, an open-source tool, generates that suite and its dependency…
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Regression Testing vs Integration Testing: Key Differences
Here is a situation most backend teams have lived through. A developer changes how the user service formats dates. It is a tiny change: one line, a cleaner ISO format, every unit test still green. The pull request gets approved in five minutes. Two days later, the billing service starts failing to generate invoices, because…
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Integration Testing vs Functional Testing: Key Differences
Ask five engineers whether a test is "functional" or "integration" and you will probably get three answers. That is not because people are confused. It is because the same test can honestly be both. Here is the short version. Integration testing checks that components work together. Functional testing checks that the software does what the…
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Regression Testing in Agile: Test Every Sprint Without Slowing Down
Regression testing in agile happens inside every sprint, alongside the stories being built. Targeted tests run on each pull request, the full suite runs before sprint review and every release, and hotfixes get a check of their own. The whole team shares the work while one tester curates the suite, and it stays fast when…
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What is API Simulation? Tools, Types & Use Cases
API simulation replaces real dependencies with stand-ins that respond like the actual service, keeping tests deterministic and free from rate limits, per-call fees, or unfinished upstream APIs. Simulators are built from hand-written stubs, OpenAPI specs, or recorded traffic; Keploy follows the recorded-traffic approach, capturing real HTTP, gRPC, database, and queue calls and replaying them automatically.…
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14 best API mocking tools in 2026 (open source and paid)
Your frontend is ready, but the backend endpoint it depends on ships next sprint. Your QA team wants to test a payment flow, but the third party sandbox is down again. Your CI pipeline fails twice a week because a staging database returned different data. All three problems have the same fix: an API mocking…
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10 best BDD testing tools in 2026 (compared by language)
For years, picking a BDD testing tool was a two-option decision: Cucumber if you wrote Java, JavaScript, or Ruby, and SpecFlow if you lived in .NET. That changed when SpecFlow reached end of life in December 2024, and newer stacks like Playwright and Go now have their own BDD options. This guide compares the 10…
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10 Best Service Virtualization Tools (2026): By Use Case
Service virtualization tools don’t all solve the same problem. One team needs to simulate a single flaky HTTP dependency in CI. Another is dealing with mainframe middleware and legacy messaging protocols that most tools don’t touch. A third is running microservices on Kubernetes and wants traffic captured automatically without writing a single stub file. The…
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What Is Service Virtualization: Definition, Types & Tools (2026)
Service virtualization replaces real external dependencies (APIs, databases, queues, or third-party services) with controlled simulations that respond like the real thing. Tests run against these virtual services whether the real dependency is unavailable, expensive to call, or still being built. Keploy implements this by capturing real dependency interactions from live traffic and replaying them automatically…
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Playwright API Testing: A Complete Guide (2026)
Playwright API testing uses the HTTP client built into Playwright, called APIRequestContext, to send requests and assert on responses inside a Playwright test. You don’t need a browser or a separate tool. If your team already uses Playwright for end-to-end browser tests, the API layer requires no separate testing framework. It runs inside the same…