@Test(expected = IllegalArgumentException.class)
public void testFilterRequiredClientHostName() {
// Given
Feature f1 = ff4j.getFeature(F1);
Assert.assertNotNull(f1.getFlippingStrategy());
org.ff4j.strategy.ClientFilterStrategy cStra = (ClientFilterStrategy) f1.getFlippingStrategy();
Assert.assertNotNull(cStra.getInitParams());
Assert.assertEquals(1, cStra.getInitParams().size());
Assert.assertTrue(f1.isEnable());
// When
FlippingExecutionContext fex = new FlippingExecutionContext();
fex.addValue(FEATURE_NEW, FEATURE_NEW);