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Within the project, you can find the code using Citrus in the REST project, in the Assertion module, under src/test/java/be/cetic/M2/features

This part of the project is made to design new test cases and should not be modified by Software vendors.

Further information

Citrus has a pretty well made and complete documentation including examples on their website : https://citrusframework.org/citrus/reference/2.8.0/html/index.html