I am trying to run my first test with junit on a Spring Web Flow Project from within Eclipse and also from the console with mvn test and but give me the same error.
I have to keep Spring v2.5, downgrading to JUnit 4.4 resolves the problem.
Moreover, you'll see original cause hidden by Assume$AssumptionViolatedException ;)
FYI, Moving to latest spring-test 2.5.6 won't change anything.
Linked SO : Junit4 + Spring 2.5 : Asserts throw "NoClassDefFoundError"