Ply is a modern testing tool used for testing APIs, contracts, and system behavior via declarative YAML test cases. It enables developers and QA teams to write readable, reusable test cases for REST APIs, including request assertions and sequence validations. Ply also supports mock servers, test-driven API development (TD-API), and integration with CI pipelines. It is ideal for ensuring API stability, contract enforcement, and test automation in microservices.
At ITBCO Solutions, Ply is used in projects with strict API contracts to ensure consistency and avoid breaking changes across teams. We use Ply to test endpoints in our Node.js and Express apps before deploying to staging and production. It simplifies writing test scenarios for public and private APIs using clean, maintainable YAML syntax. We also use it as part of our CI workflows for integration and contract validation.
API testing and contract validation
Microservice-based architectures
Test-driven API development
CI-integrated test pipelines
Ply enables contract-based testing with human-readable syntax. It reduces test setup complexity while providing full validation and coverage. Great for collaboration between frontend, backend, and QA teams. Integrates well with CI pipelines and supports mock API workflows.
YAML-based readable test cases
Mock server support for test isolation
Detailed assertion reporting
Lightweight and easy to integrate
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