API & Microservices Testing
Agentic Testing for APIs & Microservices
Autonomous agents that generate, execute, and monitor API test suites — validating contracts, performance, and integration across your service mesh.
Microservices Multiply Your Integration Surface
A monolith has internal method calls. Microservices have HTTP APIs, message queues, event buses, and shared databases. Every service boundary is a potential point of failure, and every deployment can break a consumer that the deploying team doesn't even know about. The integration surface grows quadratically with the number of services.
Contract Drift
Service A changes a response field. Services B, C, and D consume that field. Nobody knows until B crashes in production — because contract testing wasn't in place or wasn't kept current.
Dependency Chains
Testing Service A requires Service B, which requires Service C. Setting up realistic test environments for integration testing is a project in itself.
Slow Feedback
Integration tests run in staging or nightly environments. By the time a break is detected, multiple PRs have been merged and the responsible change is buried.
Partial Outage Complexity
When one service degrades, the cascading impact across dependent services is hard to predict and harder to test. Circuit breakers and fallbacks are rarely validated.
Continuous Contract and Integration Validation
QualityWatcher agents infer API contracts from specs, captured traffic, and existing documentation. They generate comprehensive test suites that validate contracts, performance, error handling, and cascading failure behaviour — and run them on every pull request, not just in nightly builds.
Every endpoint
Contract Coverage
On every PR
Feedback Speed
-60%
Integration Failures
What You Get
Contract Generation From Specs
Import OpenAPI, AsyncAPI, or GraphQL schemas to auto-generate contract test suites.
The platform parses your API specifications and generates tests for every endpoint — request validation, response schema verification, required vs. optional fields, enum constraints, and nested structures. When the spec changes, the tests update. When the implementation drifts from the spec, the failure is immediate.
Consumer-Driven Contract Testing
Validate that provider changes don't break any consumer's expectations.
Each consumer service defines the subset of the provider's API it depends on. When the provider deploys a change, the platform validates it against all consumer contracts. A provider can't merge a change that would break a consumer — even if the change is technically backwards-compatible for most consumers.
Edge Case & Error Scenario Generation
Agents generate the boundary values, malformed inputs, and error scenarios that hand-written tests miss.
For every endpoint, the platform generates tests for null values, empty strings, type mismatches, oversized payloads, special characters, SQL injection patterns, and authentication edge cases. This coverage would take days to write manually and is generated in minutes.
Performance Baseline Monitoring
Track response times per endpoint and flag regressions with commit-level attribution.
The platform establishes P50/P95/P99 baselines per endpoint and validates them on every run. When a new database index or a changed query introduces latency, the regression is flagged on the PR that caused it — not discovered during a load test two weeks later.
Cascading Failure Testing
Validate circuit breakers, fallbacks, retries, and timeout behaviour when dependencies fail.
Agents simulate upstream failures — timeouts, 500 errors, malformed responses, connection resets — and validate that your service handles them correctly. Circuit breaker activation, fallback responses, retry behaviour, and graceful degradation are all tested explicitly.
Multi-Service Chain Validation
Test end-to-end workflows that span multiple services in sequence.
Define chains where the output of one API feeds into the next — create user → create order → process payment → send confirmation. The platform manages authentication, data dependencies, and state between services, validating the complete distributed workflow.
See It in Context
Breaking Schema Change
Situation
The payments service renames a response field from `transactionId` to `txnId`. The order service, notification service, and analytics service all consume that field. None of them have contract tests.
Outcome
Consumer-driven contracts catch the break on the payments team's PR. The diff shows exactly which field changed and which consumers are affected. The break is resolved before it reaches any environment beyond the developer's machine.
Service Degradation
Situation
The recommendation service starts timing out under load. The product page depends on it, but the fallback logic hasn't been tested since it was written 18 months ago. In production, the fallback fails silently and the product page shows empty results.
Outcome
Cascading failure tests validated the fallback logic on every build. When the fallback implementation drifted from the expected behaviour, the test caught it. When the real timeout occurs, the fallback works correctly.
API Version Migration
Situation
A platform team needs to migrate 40 internal consumers from API v2 to v3 over 3 months. Both versions must coexist, and each consumer must be validated against v3 before switching.
Outcome
Contract tests for each consumer are run against both v2 and v3. The platform tracks migration status per consumer and validates that v3 serves every consumer's needs before v2 is deprecated.
How It Works
Import or Infer Contracts
Upload OpenAPI specs, capture API traffic, or let agents infer contracts from existing integration patterns.
Generate Test Suites
Agents produce contract tests, edge case tests, performance baselines, and cascading failure scenarios for every service.
Validate on Every PR
Contract and integration tests run on every pull request. Consumer-driven contracts ensure provider changes don't break any consumer.
Monitor Service Health
Dashboards show contract compliance, latency trends, and integration health across your entire service mesh.