private void cleanup() {
        stateManager.detach(bulletAppState);
        stateManager.detach(stateManager.getState(BulletDebugAppState.class));
        for (Spatial s : testObjects) {
            rootNode.detachChild(s);
        }
    }
Test demonstrating a GImpactCollisionShape falling through a curved mesh, when using JBullet. Bullet native
does not experience this issue at the time this test was created.

@author lou
jme3-examples/src/main/java/jme3test/bullet/TestIssue1120.java