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Apache Struts 2 Documentation
How can we test Actions
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The Struts 2 Action doesn't expose HTTP in its signature. When access to HTTP resources is needed, references to these resources can be injected at runtime, but, to the Action, the servlet resources appear as ordinary Maps. When running tests outside of the framework, the test scaffolding can create and set a Map with whatever objects are needed by the test.

There are several approaches to unit testing Struts 2-based applications, whether using JUnit or TestNG. Two popular techniques are direct Action invocation and testing interceptors and result-types independently. We will demonstrate both approaches using JUnit 3.

## Direct Action Invocation

The simplest approach is to instantiate your Actions, call the appropriate setters, then invoke `execute`. Calling the Action directly allows you to bypass all the complicated container setup.

Taken from Petsoar

## Testing Interceptors and/or Result Types

Check out the test suites in XWork and Struts 2. These suites are comprehensive and provide a good starting point. Here's an example.

Test for ParametersInterceptor

The framework also provides built-in support for JUnit 3.8 via an abstract StrutsTestCase, which provides common Struts variables and setup code.