JexlScriptEngineOptionalTest.java

/*
* Copyright 2016 Nabarun Mondal
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/


package com.noga.njexl.lang.scripting;

import java.io.StringWriter;
import javax.script.Compilable;
import javax.script.CompiledScript;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import junit.framework.TestCase;

public class JexlScriptEngineOptionalTest extends TestCase {
    private final JexlScriptEngineFactory factory = new JexlScriptEngineFactory();
    private final ScriptEngineManager manager = new ScriptEngineManager();
    private final ScriptEngine engine = manager.getEngineByName("jexl");

    public void testOutput() throws Exception {
        String output = factory.getOutputStatement("foo\u00a9bar");
        assertEquals("JEXL.out.print('foo\\u00a9bar')", output);
        // redirect output to capture evaluation result
        final StringWriter outContent = new StringWriter();
        engine.getContext().setWriter(outContent);
        engine.eval(output);
        assertEquals("foo\u00a9bar", outContent.toString());
    }

    public void testError() throws Exception {
        String error = "JEXL.err.print('ERROR')";
        // redirect error to capture evaluation result
        final StringWriter outContent = new StringWriter();
        engine.getContext().setErrorWriter(outContent);
        engine.eval(error);
        assertEquals("ERROR", outContent.toString());
    }

    public void testCompilable() throws Exception {
        assertTrue("Engine should implement Compilable", engine instanceof Compilable);
        Compilable cengine = (Compilable) engine;
        CompiledScript script = cengine.compile("40 + 2");
        assertEquals(Integer.valueOf(42), script.eval());
        assertEquals(Integer.valueOf(42), script.eval());
    }
}