Introduction to testing mule
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Unit testing validates individual units of code, like Mule flows, to check their correctness in isolation. Integration testing validates how units of code work together by testing entire applications or groups of interconnected flows. The document provides guidance on unit and integration testing for Mule applications, including writing modular, short flows; using environments for integration tests; and parameterizing code with placeholders.
Introduction to testing mule
- 2. There are several types of testing. Likely, you focus on one or more types depending on your specific needs, such as specific contexts or products. From the point of view of a Mule applications developer, it’s fair to say that there are two main types of testing that you should focus on when validating the behavior of your Mule application: Unit testing Integration testing
- 3. Unit Testing The concept of the unit test may vary according to the programming paradigm that you are working on, but it always revolves around the same core concept: to validate the correctness of an individual unit of source code. In the context of unit testing, we consider a unit of code to be the smallest testable part of an application. What exactly constitutes the smallest testable part of an application depends on the application. In the case of Mule applications, we consider that the smallest testable part is a Mule flow (sub-flow); thus this is our unit of code.
- 4. Units of code collaborate between them to create an actual application. You test individual units of code with unit tests, and you test how units of code collaborate between them with integration tests. The goal of an Integration test is to validate that different units of code and modules work together as intended. Ideally, integration tests should aggregate units of code modules that have already been successfully unit-tested. For this reason, you should run your integration tests after your unit tests.
- 5. Depending on the nature of your application, integration tests may require sandboxes, that is, environments for your application to connect to. When working with sandboxes, take care to ensure that the state of the data in the sandbox is correct for the test to produce the intended result. Perform this before and after running the integration test.
- 6. Modularize your code: Breaking down your code in different files helps with readability. The usual way to do this is to group flows that help to achieve a common goal, or group code according to specific functional criteria. Modularizing your code allows you to load only that portion of code that you actually wish to test, avoiding the need to load unnecessary configurations during your test. Write short flows: Long flows are hard to follow and sometimes even harder to code; certainly they are harder to maintain. From the perspective of unit testing, long flows offer too many scenarios that can be triggered by a single point. Long flows can force you to perform very complex evaluations to validate a single scenario and are best avoided.
- 7. Define execution environments: Parameterize your code using placeholders. Normal use cases for this include addresses of outbound endpoints, such as DB or HTTP. Using placeholders allows you to modify the actual address when running tests (either unit or integration), and make it easier to promote your code between environments (DEV/QA/UAT/PROD). Mule applications running in Mule Runtime v3.8 and newer can only be tested using MUnit v1.2.0 or higher.