/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You 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 org.apache.commons.jexl3.scripting;
  
  import java.io.StringWriter;
  import javax.script.Compilable;
  import javax.script.CompiledScript;
  
  import javax.script.ScriptEngine;
  import javax.script.ScriptEngineManager;
  import org.junit.Assert;
  import org.junit.Test;
  
  public class JexlScriptEngineOptionalTest {
      private final JexlScriptEngineFactory factory = new JexlScriptEngineFactory();
      private final ScriptEngineManager manager = new ScriptEngineManager();
      private final ScriptEngine engine = manager.getEngineByName("jexl");
  
      @Test
      public void testOutput() throws Exception {
          final String output = factory.getOutputStatement("foo\u00a9bar");
          Assert.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);
          Assert.assertEquals("foo\u00a9bar", outContent.toString());
      }
  
      @Test
      public void testError() throws Exception {
          final String error = "JEXL.err.print('ERROR')";
          // redirect error to capture evaluation result
          final StringWriter outContent = new StringWriter();
          engine.getContext().setErrorWriter(outContent);
          engine.eval(error);
          Assert.assertEquals("ERROR", outContent.toString());
      }
  
      @Test
      public void testCompilable() throws Exception {
          Assert.assertTrue("Engine should implement Compilable", engine instanceof Compilable);
          final Compilable cengine = (Compilable) engine;
          final CompiledScript script = cengine.compile("40 + 2");
          Assert.assertEquals(42, script.eval());
          Assert.assertEquals(42, script.eval());
      }
  }