Ex2_Test.java

//לואי שרקיה  206706285
import static org.junit.jupiter.api.Assertions.*;
import org.junit.jupiter.api.Test;
import static org.junit.Assert.fail;//

class Ex2_Test {
	static double[] po1 = { 2, 0, 3, -1, 0 }, po2 = { 0.1, 0, 1, 0.1, 3 };
	static final double EPS = 0.0001;

	@Test
	void testadd() {
		double[] p1 = { 2, 3, 4 };
		double[] p2 = { 2, 3 };
		double[] p3 = {4,6,4};

		assertEquals(p3,Ex2.add(p1, p2));
	}
	@Test
	void testmull() {
		double[] p1 = { 2, 3, 4 };
		double[] p2 = { 2, 3 };
		double[] p3 = {4,12,17,12};

		assertEquals(p3,Ex2.mul(p1, p2));
	}
	@Test
	void testpoly() {
		double[] arr = { 2, 0, 3, -1 };
		String s="-1.0x^3+3.0x^2+2.0";

		assertEquals(s,Ex2.poly(arr));
	}

	@Test
	void testF() {
		double fx0 = Ex2.f(po1, 0);
		double fx1 = Ex2.f(po1, 1);
		double fx2 = Ex2.f(po1, 2);
		assertEquals(fx0,2);
		assertEquals(fx1,4);
		assertEquals(fx2,6);
	}

	@Test
	void testRoot() {
		double x12 = Ex2.root(po1, 0, 10, EPS);
		assertEquals(x12, 3.1958, 0.001);
	}

	@Test
	void testDerivativeArrayDoubleArray() {
		double[] p = { 1, 2, 3 }; // 3X^2+2x+1
		double[] dp1 = { 2, 6 }; // 6x+2
		double[] dp2 = Ex2.derivative(p);
		assertEquals(dp1[0], dp2[0], EPS);
		assertEquals(dp1[1], dp2[1], EPS);
		assertEquals(dp1.length, dp2.length);
	}
}