Unit Testing File Upload REST API using Spring MVC MockMvc

Today a colleague asked me how he could unit test a Spring MVC REST resource. I am using Spring MVC test support for some time now so the obvious answer was to use MockMvc. In case you have not used MockMvc, it allows you to declaratively write tests for your Spring MVC controllers. Rather than calling controllers directly, you use the MockMvc fluent API to make a request to a URL and verify the response returned by the API. You can read Spring MVC documentation to learn about MockMvc in detail.

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