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Spring Actionscript made some extensions to FlexUnit that are being used in the unit test project.
Its true that these functions shouldn't be part of Spring Actionscript itself, and there has been talk about a flex-commons project as well. Just like the springAS offshoot as3-commons.
This hasn't been realised yet though, it probably will happen in the future but for now the dependency is a fact.
The SAS flexunit package contains only one class: FlexUnitTestCase, which is an exentension of TestCase. So only the TestCase from FlexUnit will be linked into SAS, I doubt this will yield much size increase... As you will see in the distribution package the spring-actionscript-core-0.8.1.swc file is around 165Kb.
So no worries there