Rest api tools like postman8/10/2023 ![]() Pact tests are written like any other unit test, and requires access to the code base of the System under Test to ensure that any expectations are based on how the consumer and provider behave, so that the tests can't drift from the actual implementation. The main purpose of Pact is to ensure that a consumer (such as a Web App or another API) and a provider API are compatible with each other - without ever having to test them together using an end-to-end integrated test suite. When combined with PactFlow (or a Pact Broker), it becomes a powerful continuous-delivery tool. It is a code-first tool for testing HTTP and message integrations using an approach known as contract tests. Pact is an open source consumer driven contract testing framework designed to test distributed systems. Screenshot of Postman (courtesy of ) Pact - the most broadly adopted contract testing specification Postman testers can set up test suites (in the form of collections) that contain consumer expectations however, these are not connected to real-world consumer behavior and must be maintained manually. ![]() Postman is a provider-only testing tool, in that it does not test how a consumer (e.g., a web application or another API) actually interacts with a provider. It's ideally suited to exploring and collaborating on APIs and running functional API tests. ![]() Postman (and Newman) do not require direct access to the code for the System under Test (SUT), as they test it from the outside in a black-box style test. Postman is a collaboration platform for API development, it has a fantastic IDE-like GUI that makes it easy to explore and navigate an API and a scripting language in NodeJS that you can use to automate checks against an API Provider that you can run in your CI pipelines. In this article, we discuss the differences in approach and the pros and cons of using the Pact consumer-driven contract testing framework and Postman for various API testing-related scenarios. Contract testing with the OSS Pact framework and PactFlow is often compared to tools like Postman, Insomnia and other REST API testing tools.
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