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

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

import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.scijava.Context;
import org.scijava.console.ConsoleService;
import org.scijava.main.console.MainArgument;

/**
 * Tests {@link MainService}.
 *
 * @author Curtis Rueden
 */
public class MainServiceTest {

	private MainService mainService;

	@Before
	public void setUp() {
		MathMain.resultCount = 0;
		final Context context = new Context();
		mainService = context.service(MainService.class);
	}

	@After
	public void tearDown() {
		mainService.context().dispose();
	}

	/**
	 * Tests {@link MainService#execMains()},
	 * {@link MainService#addMain(String, String...)} and
	 * {@link MainService#getMains()}.
	 */
	@Test
	public void testMainService() {
		final int mainCount0 = mainService.execMains();
		assertEquals(0, mainCount0);

		mainService.addMain(MathMain.class.getName(), "12.3", "/", "4.56");

		final int mainCount1 = mainService.execMains();
		assertEquals(1, mainCount1);
		assertEquals(System.getProperty(key(0)), "2.697368421052632");
	}

	/** Tests usage of {@link MainService} via {@code --main} CLI arguments. */
	@Test
	public void testConsoleArgs() {
		assertEquals(0, mainService.getMains().length);

		final ConsoleService consoleService = mainService.context().service(
			ConsoleService.class);
		consoleService.processArgs("-Dfoo=bar", //
			"--main", "org.scijava.main.MainServiceTest$MathMain", "5", "+", "6", //
			"--", "-Dwhiz=bang", //
			"--main", "org.scijava.main.MainServiceTest$MathMain", "7", "-", "4");

		final MainService.Main[] m = mainService.getMains();
		assertEquals(2, m.length);
		assertEquals("org.scijava.main.MainServiceTest$MathMain", m[0].className());
		assertArrayEquals(new String[] {"5", "+", "6"}, m[0].args());
		assertEquals("org.scijava.main.MainServiceTest$MathMain", m[1].className());
		assertArrayEquals(new String[] {"7", "-", "4"}, m[1].args());

		final int mainCount = mainService.execMains();
		assertEquals(2, mainCount);
		assertEquals(System.getProperty(key(0)), "11.0");
		assertEquals(System.getProperty(key(1)), "3.0");

		assertEquals(System.getProperty("foo"), "bar");
		assertEquals(System.getProperty("whiz"), "bang");
	}

	// -- Helper methods --

	private static String key(final int index) {
		return MathMain.class.getName() + ":" + index;
	}

	// -- Helper classes --

	private static class MathMain {
		private static int resultCount = 0;
		@SuppressWarnings("unused")
		public static void main(final String[] args) {
			if (args.length != 3) {
				throw new IllegalArgumentException("Invalid args: " + args);
			}

			// compute a result from the arguments
			final double operand1 = Double.parseDouble(args[0]);
			final String operator = args[1];
			final double operand2 = Double.parseDouble(args[2]);
			final double result;
			if (operator.equals("+")) result = operand1 + operand2;
			else if (operator.equals("-")) result = operand1 - operand2;
			else if (operator.equals("*")) result = operand1 * operand2;
			else if (operator.equals("/")) result = operand1 / operand2;
			else throw new IllegalArgumentException("Unknown operator: " + operator);

			// save the result to a system property, for later checking
			final String key = MathMain.class.getName() + ":" + resultCount++;
			final String value = "" + result;
			System.setProperty(key, value);
		}
	}
}

Add tests for the MainService