AppTest.java

package uk.ac.ebi.example;

import static junit.framework.Assert.assertEquals;
import static junit.framework.Assert.assertTrue;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;

import junit.framework.Assert;

import org.junit.BeforeClass;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Unit test for the example CLI {@link App}.
 */
public class AppTest
{
	private static Logger log = LoggerFactory.getLogger ( AppTest.class );

	@BeforeClass
	public static void setNoExitOption ()
	{
		// Prevents the CLI from invoking System.exit()
		System.setProperty ( App.NO_EXIT_PROP, "true" );
	}
	
	
	
	@Test
	public void testApp()
	{
		// Capture the output into memory
		PrintStream outBkp = System.out;
		ByteArrayOutputStream outBuf = new ByteArrayOutputStream ();
		System.setOut ( new PrintStream ( outBuf ) );
		
		App.main (  "a", "b", "c" );

		System.setOut ( outBkp ); // restore the original output
		
		log.debug ( "CLI output:\n{}", outBuf.toString () );
		Assert.assertTrue ( "Can't find CLI output!", outBuf.toString ().contains ( "a\tb\tc" ) );
		assertEquals ( "Bad exit code!", 0, App.getExitCode () );
	}

	@Test
	public void testHelpOption()
	{
		// Capture the output into memory
		PrintStream outBkp = System.out;
		ByteArrayOutputStream outBuf = new ByteArrayOutputStream ();
		System.setOut ( new PrintStream ( outBuf ) );

		App.main (  "--help" );
		
		System.setOut ( outBkp );  // restore the original output

		log.debug ( "CLI output:\n{}", outBuf.toString () );
		assertTrue ( "Can't find CLI output!", outBuf.toString ().contains ( "*** Command Line Example ***" ) );
		assertEquals ( "Bad exit code!", 1, App.getExitCode () );
	}

}