Automated contract testing
Blog post from Qase
APIs serve as crucial intermediaries that facilitate communication and data exchange between different software systems, offering benefits such as integration, increased efficiency, innovation, and improved security. In the context of software testing, APIs are primarily tested through integration tests to ensure seamless communication between various components, with API contract testing playing a vital role in validating an API's behavior against its agreed-upon specifications. This helps detect breaking changes, improve collaboration, and automate testing processes for increased reliability. The article details a method for automatic contract testing using an OpenAPI specification to generate Postman JSON, which is then filled with semantically correct data and tested in a CI pipeline with Newman. This approach aims to minimize human error, ensure that server changes do not disrupt the API's functionality, and save time on manual testing by blocking CI processes if tests fail, thereby preventing faulty code or specifications from reaching production.
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