Currently the TCK test use BeforeMethod to setup the validator under test, for example:

	@BeforeMethod
	public void setupValidator() {
		executableValidator = TestUtil.getValidatorUnderTest().forExecutables();
	}

Due to the fact that the Arquillian TestNg runner cannot influence the execution of these life cycle methods, the annotated methods are executed also in the JVM executing the tests, not only in the remote container. For that reason the bean validation provider must be on the classpath of the client side as well which is otherwise not required.

See also http://planet.jboss.org/post/arquillian_and_testng