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 * Institute of Molecular Cell Biology and Genetics.
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package org.scijava.script;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;

import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.util.Arrays;
import java.util.List;

import javax.script.ScriptEngine;
import javax.script.ScriptException;

import org.junit.Test;
import org.scijava.Context;
import org.scijava.plugin.Plugin;

/**
 * Basic tests for the {@link ScriptService}.
 * 
 * @author Johannes Schindelin
 */
public class ScriptEngineTest {

	@Test
	public void testRot13() throws Exception {
		final Context context = new Context(ScriptService.class);
		final ScriptService scriptService = context.getService(ScriptService.class);
		final ScriptLanguage hello = scriptService.getLanguageByName("Hello");
		assertNotNull(hello);
		final ScriptLanguage rot13 = scriptService.getLanguageByName("Rot13");
		assertEquals(hello, rot13);
		assertEquals("Svool", rot13.getScriptEngine().eval("Hello"));
	}

	@Plugin(type = ScriptLanguage.class)
	public static class Rot13 extends AbstractScriptLanguage {

		@Override
		public ScriptEngine getScriptEngine() {
			return new Rot13Engine();
		}

		@Override
		public List<String> getNames() {
			return Arrays.asList("Hello", "World", "Rot13");
		}
	}

	public static class Rot13Engine extends AbstractScriptEngine {

		@Override
		public Object eval(String script) throws ScriptException {
			return eval(new StringReader(script));
		}

		@Override
		public Object eval(Reader reader) throws ScriptException {
			final StringBuilder builder = new StringBuilder();
			try {
				for (;;) {
					int c = reader.read();
					if (c < 0) {
						break;
					}
					if (c >= 'A' && c <= 'Z') {
						c = 'Z' - c + 'A';
					} else if (c >= 'a' && c <= 'z') {
						c = 'z' - c + 'a';
					}
					builder.append((char) c);
				}
			} catch (final IOException e) {
				throw new ScriptException(e);
			}
			return builder.toString();
		}
	}
}

Add a unit test for the script service