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package org.scijava.console;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;

import java.util.LinkedList;

import org.junit.Test;

/**
 * Tests {@link SystemPropertyArgument}.
 * 
 * @author Curtis Rueden
 */
public class SystemPropertyArgumentTest {

	@Test
	public void testSystemProperties() {
		assertPropertySet("foo", "bar");
		assertPropertySet("prop.with.dots", "true");
		assertPropertySet("prop-with-dashes", "whiz");
		assertPropertySet("prop_with_underscores", "bang");
		assertPropertySet("empty.value", "");
		assertPropertySet("unspecified.value", null);
		assertPropertySet("_-_", "legal");
		assertPropertySet("-_-", "also legal");
	}

	private void assertPropertySet(final String key, final String value) {
		final SystemPropertyArgument spa = new SystemPropertyArgument();
		final LinkedList<String> args = new LinkedList<>();
		args.add(value == null ? "-D" + key : "-D" + key + "=" + value);
		assertTrue(spa.supports(args));
		assertNull(System.getProperty(key));
		spa.handle(args);
		assertTrue(args.isEmpty());
		assertEquals(value == null ? "" : value, System.getProperty(key));
	}

}
