@Test
public void testClear() {

    ColumnStore<Node> store = new ColumnStore(Node.class, false);
    ColumnImpl col = new ColumnImpl("0", Integer.class, null, null, Origin.DATA, false, false);
    store.addColumn(col);
    store.clear();
    Assert.assertFalse(store.hasColumn("0"));
    Assert.assertEquals(store.size(), 0);
}