package edu.neu.ccs.evergreen.util;

import static org.junit.Assert.assertEquals;

import org.junit.Test;

/**
 * Test results returned by app mean.
 */
public class AppMeanTest {
	/**
	 * Test no weights.
	 */
	@Test
	public void testAppMean() {
		double weights[] = new double[256];
		double result = AppMean.appMean(weights);
		assertEquals(Double.MIN_VALUE, result, Polynomial.DELTA);
	}

	/**
	 * Verify max bias returned by polynomial.
	 */
	@Test
	public void testMax0To1() {
		Polynomial polynomial = new Polynomial(1, -3, 3, 0);
		double result = AppMean.maxX0To1(polynomial);
		assertEquals(1.0, result, Polynomial.DELTA);

		polynomial = new Polynomial(0, -1, 1, 0);
		result = AppMean.maxX0To1(polynomial);
		assertEquals(0.5, result, Polynomial.DELTA);

		polynomial = new Polynomial(0, 1, -2, 1);
		result = AppMean.maxX0To1(polynomial);
		assertEquals(0.0, result, Polynomial.DELTA);

		polynomial = new Polynomial(1, 0, 0, 0);
		result = AppMean.maxX0To1(polynomial);
		assertEquals(1.0, result, Polynomial.DELTA);

		polynomial = new Polynomial(-1, 0, 0, 0);
		result = AppMean.maxX0To1(polynomial);
		assertEquals(0.0, result, Polynomial.DELTA);

		polynomial = new Polynomial(1, -2, 1, 0);
		result = AppMean.maxX0To1(polynomial);
		assertEquals(1.0 / 3.0, result, Polynomial.DELTA);

		polynomial = new Polynomial(1.0 / 3.0, 0, 2, 0);
		result = AppMean.maxX0To1(polynomial);
		assertEquals(1.0, result, Polynomial.DELTA);
	}
}