@Test
    public void testSetTransitionLength_positiveNumberInput_noExceptionThrown() {
        AnimClip animClip = new AnimClip("clip");
        ClipAction clipAction = new ClipAction(animClip);
        clipAction.setTransitionLength(1.23d);
        assertEquals(1.23d, clipAction.getTransitionLength(), 0);
    }
Test to verify setTransitionLength on BlendableAction accepts positive values.
jme3-core/src/test/java/com/jme3/anim/tween/action/ClipActionTest.java