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package org.scijava.util;

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

import org.junit.Test;

/**
 * Tests {@link VersionUtils}.
 * 
 * @author Curtis Rueden
 */
public class VersionUtilsTest {

	/** Tests {@link VersionUtils#compare(String, String)}. */
	@Test
	public void testCompare() {
		// SemVer PATCH version.
		assertTrue(VersionUtils.compare("1.5.1", "1.5.2") < 0);
		assertTrue(VersionUtils.compare("1.5.2", "1.5.1") > 0);

		// SemVer MINOR version.
		assertTrue(VersionUtils.compare("1.5.2", "1.6.2") < 0);
		assertTrue(VersionUtils.compare("1.6.2", "1.5.2") > 0);

		// SemVer MAJOR version.
		assertTrue(VersionUtils.compare("1.7.3", "2.7.3") < 0);
		assertTrue(VersionUtils.compare("2.7.3", "1.7.3") > 0);

		// Suffix indicates version is older than final release.
		assertTrue(VersionUtils.compare("1.5.2", "1.5.2-beta-1") > 0);

		// Check when number of version tokens does not match.
		assertTrue(VersionUtils.compare("1.5", "1.5.1") < 0);
		assertTrue(VersionUtils.compare("1.5.1", "1.5") > 0);

		// Check equality.
		assertEquals(VersionUtils.compare("1.5", "1.5"), 0);

		// Check ImageJ 1.x style versions.
		assertTrue(VersionUtils.compare("1.50a", "1.50b") < 0);

		// Check four version tokens.
		assertTrue(VersionUtils.compare("1.5.1.3", "1.5.1.4") < 0);
		assertTrue(VersionUtils.compare("1.5.1.6", "1.5.1.5") > 0);
		assertEquals(VersionUtils.compare("10.4.9.8", "10.4.9.8"), 0);

		// Check non-numeric tokens.
		assertTrue(VersionUtils.compare("a.b.c", "a.b.d") < 0);
		
		// Check for numerical (not lexicographic) comparison.
		assertTrue(VersionUtils.compare("2.0", "23.0") < 0);
		assertTrue(VersionUtils.compare("23.0", "2.0") > 0);
		assertTrue(VersionUtils.compare("3.0", "23.0") < 0);
		assertTrue(VersionUtils.compare("23.0", "3.0") > 0);

		// Check weird stuff.
		assertTrue(VersionUtils.compare("1", "a") < 0);
		assertTrue(VersionUtils.compare("1", "%") > 0);
		assertTrue(VersionUtils.compare("", "1") < 0);
		assertTrue(VersionUtils.compare("1", "1.") < 0);
		assertTrue(VersionUtils.compare("", ".") < 0);
		assertTrue(VersionUtils.compare("", "..") < 0);
		assertTrue(VersionUtils.compare(".", "..") < 0);
	}
}
