package net.sf.javaml.core;

import static org.junit.Assert.*;
import org.junit.Test;

public class TestComplex {
	public static boolean apprEq(double d1, double d2){
		final double accuracy = 0.000001;
		double diff = d1 - d2;
		return diff <= accuracy && diff >= -accuracy;
	}
	
	@Test
	public void test(){
		Complex c = new Complex();
		c = new Complex(0, 1);
		
		assertNotNull(c.toString());
		assertTrue(apprEq(c.abs(), 1.0));
		
		Complex res = Complex.multiply(c, Complex.I);
		assertTrue(apprEq(res.re, -1.0) && apprEq(res.im, 0.0));
		
		res = Complex.multiply(c, 5.0);
		assertTrue(apprEq(res.re, 0) && apprEq(res.im, 5.0));

		res = Complex.plus(c, Complex.I);
		assertTrue(apprEq(res.re, 0) && apprEq(res.im, 2.0));

		
		assertTrue(apprEq(c.im, 1.0) && apprEq(c.re, 0.0));

		c.conjugate();
		assertTrue(apprEq(c.im, -1.0));
		c.conjugate();
		assertTrue(apprEq(c.im, 1.0));
		
		c.times(0.0);
		assertTrue(apprEq(c.im, 0.0) && apprEq(c.re, 0.0));
		
		c.re = 2.0; c.im = 2.0;
		c.times(new Complex(2.0, 2.0));
		assertTrue(apprEq(c.re, 0.0) && apprEq(c.im, 8.0));
		
		c.minus(c);
		assertTrue(apprEq(c.re, 0.0) && apprEq(c.im, 0.0));
		
		c.re = 2.0; c.im = 2.0;
		c.plus(c);
		c.minus(c);
		c.minus(c);
		assertTrue(apprEq(c.re, 0.0) && apprEq(c.im, 0.0));
				
	}
}