@Test
public void testSetVariable() {
elp.setVariable("xx", "100");
Object result = elp.getValue("xx + 11", String.class);
assertEquals(result, "111");
elp.setVariable("xx", null);
assertEquals(elp.eval("xx"), null);
elp.setVariable("yy", "abc");
assertEquals(elp.eval("yy = 123; abc"), 123L);
assertEquals(elp.eval("abc = 456; yy"), 456L);
}
