ArrayUtilTest.java

package week02.test;

import org.junit.Assert;
import org.junit.Test;

import week02.array.ArrayUtil;

public class ArrayUtilTest {

	@Test
	public void testReverseArray() {
		int[] a = new int[] { 7, 9, 30, 3 };
		int[] b = new int[] { 7, 9, 30, 3, 4 };

		ArrayUtil.reverseArray(a);
		ArrayUtil.reverseArray(b);

		Assert.assertArrayEquals(new int[] { 3, 30, 9, 7 }, a);
		Assert.assertArrayEquals(new int[] { 4, 3, 30, 9, 7 }, b);
	}

	@Test
	public void testRemoveZero() {
		int[] oldArr = new int[] { 1, 3, 4, 5, 0, 0, 6, 6, 0, 5, 4, 7, 6, 7, 0, 5 };
		int[] newArray = ArrayUtil.removeZero(oldArr);
		Assert.assertArrayEquals(new int[] { 1, 3, 4, 5, 6, 6, 5, 4, 7, 6, 7, 5 }, newArray);
	}

	@Test
	public void testMerge() {
		int[] a1 = new int[] { 3, 5, 7, 8 };
		int[] a2 = new int[] { 4, 5, 6, 6, 7, 7 };
		int[] a3 = ArrayUtil.merge(a1, a2);
		Assert.assertArrayEquals(new int[] { 3, 4, 5, 6, 7, 8 }, a3);
	}

	@Test
	public void testGrow() {
		int[] oldArray = new int[] { 2, 3, 6 };
		int size = 3;
		int[] newArray = ArrayUtil.grow(oldArray, size);
		Assert.assertArrayEquals(new int[] { 2, 3, 6, 0, 0, 0 }, newArray);
	}

	@Test
	public void testFibonacci() {
		int max = 15;
		int max2 = 1;
		int[] newArray = ArrayUtil.fibonacci(max);
		int[] newArray2 = ArrayUtil.fibonacci(max2);
		Assert.assertArrayEquals(new int[] { 1, 1, 2, 3, 5, 8, 13 }, newArray);
		Assert.assertArrayEquals(new int[] {}, newArray2);
	}

	@Test
	public void testGetPrimes() {
		int[] newArray = ArrayUtil.getPrimes(23);
		Assert.assertArrayEquals(new int[] { 2, 3, 5, 7, 11, 13, 17, 19 }, newArray);
	}

	@Test
	public void testGetPerfectNumbers() {
		int[] newArray = ArrayUtil.getPerfectNumbers(1000);
		Assert.assertArrayEquals(new int[] { 6, 28, 496 }, newArray);
	}

	@Test
	public void testJoin() {
		int[] array = new int[] { 3, 8, 9 };
		String seperator = "-";
		String result = ArrayUtil.join(array, seperator);
		Assert.assertEquals("3-8-9", result);
	}

}