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package org.openjdk.jmc.common.test.unit;

import static org.openjdk.jmc.common.unit.DecimalPrefix.NONE;
import static org.openjdk.jmc.common.unit.DecimalPrefix.YOCTO;
import static org.openjdk.jmc.common.unit.DecimalPrefix.YOTTA;
import static org.openjdk.jmc.common.unit.DecimalPrefix.ZEPTO;
import static org.openjdk.jmc.common.unit.DecimalPrefix.ZETTA;
import static org.junit.Assert.assertEquals;

import org.junit.Test;
import org.openjdk.jmc.common.test.MCTestCase;
import org.openjdk.jmc.common.unit.DecimalPrefix;

public class DecimalPrefixTest extends MCTestCase {
	@Test
	public void testZero() {
		assertEquals(0, DecimalPrefix.getFloorLog1000(0));
		assertEquals(NONE, DecimalPrefix.getEngFloorPrefix(0));
	}

	@Test
	public void testYocto() {
		double yoctos = 2 * Math.pow(10, -24);
		assertEquals(-8, DecimalPrefix.getFloorLog1000(yoctos));
		assertEquals(YOCTO, DecimalPrefix.getEngFloorPrefix(yoctos));
		assertEquals(-8, DecimalPrefix.getFloorLog1000(-yoctos));
		assertEquals(YOCTO, DecimalPrefix.getEngFloorPrefix(-yoctos));
	}

	@Test
	public void testZepto() {
		double zeptos = 2 * Math.pow(10, -21);
		assertEquals(-7, DecimalPrefix.getFloorLog1000(zeptos));
		assertEquals(ZEPTO, DecimalPrefix.getEngFloorPrefix(zeptos));
		assertEquals(-7, DecimalPrefix.getFloorLog1000(-zeptos));
		assertEquals(ZEPTO, DecimalPrefix.getEngFloorPrefix(-zeptos));
	}

	@Test
	public void testYotta() {
		double yottas = 2 * Math.pow(10, 24);
		assertEquals(8, DecimalPrefix.getFloorLog1000(yottas));
		assertEquals(YOTTA, DecimalPrefix.getEngFloorPrefix(yottas));
		assertEquals(8, DecimalPrefix.getFloorLog1000(-yottas));
		assertEquals(YOTTA, DecimalPrefix.getEngFloorPrefix(-yottas));
	}

	@Test
	public void testZetta() {
		double zettas = 2 * Math.pow(10, 21);
		assertEquals(7, DecimalPrefix.getFloorLog1000(zettas));
		assertEquals(ZETTA, DecimalPrefix.getEngFloorPrefix(zettas));
		assertEquals(7, DecimalPrefix.getFloorLog1000(-zettas));
		assertEquals(ZETTA, DecimalPrefix.getEngFloorPrefix(-zettas));
	}
}
