@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); }