ArrayUtilTest.java

package com.coderising.week02.array;


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

public class ArrayUtilTest {
	
	private ArrayUtil arrayUtil;
	
	@Before
	public void setUp() {
		arrayUtil = new ArrayUtil();
	}

	@Test
	public void testReverseArray() {
        int[] a = {};
        arrayUtil.reverseArray(a);
        Assert.assertArrayEquals(new int[] {}, a);

        int[] b = {1, 2, 3};
        arrayUtil.reverseArray(b);
        Assert.assertArrayEquals(new int[] {3, 2, 1}, b);

	}

	@Test
	public void testRemoveZero() {
        int oldArr1[] = {1, 3, 4, 5, 0, 0, 6, 6, 0, 5, 4, 7, 6, 7, 0, 5};
        int newArr1[] = {1, 3, 4, 5, 6, 6, 5, 4, 7, 6, 7, 5};
        Assert.assertArrayEquals(newArr1, arrayUtil.removeZero(oldArr1));

        int oldArr2[] = {0, 0, 0, 0, 0};
        int newArr2[] = {};
        Assert.assertArrayEquals(newArr2, arrayUtil.removeZero(oldArr2));

        int oldArr3[] = {0, 0, 0, 0, 0, 1, 2, 3};
        int newArr3[] = {1, 2, 3};
        Assert.assertArrayEquals(newArr3, arrayUtil.removeZero(oldArr3));

	}

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

	@Test
	public void testGrow() {
        int[] a1 = {2, 3, 6};
        Assert.assertArrayEquals(new int[] {2, 3, 6, 0, 0, 0}, arrayUtil.grow(a1, 3));
        Assert.assertArrayEquals(new int[] {2, 3, 6}, arrayUtil.grow(a1, 0));
	}

	@Test
	public void testFibonacci() {
        Assert.assertArrayEquals(new int[] {}, arrayUtil.fibonacci(1));
        Assert.assertArrayEquals(new int[] {1, 1, 2, 3, 5, 8, 13}, arrayUtil.fibonacci(15));

        int[] a = new int[] {1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597,
                2584, 4181, 6765};
        Assert.assertArrayEquals(a, arrayUtil.fibonacci(6766));
 
	}

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

	@Test
	public void testGetPerfectNumbers() {
        Assert.assertArrayEquals(new int[] {6, 28, 496}, arrayUtil.getPerfectNumbers(497));
        Assert.assertArrayEquals(new int[] {6, 28, 496, 8128}, arrayUtil.getPerfectNumbers(8129));

	}

	@Test
	public void testJoin() {
        Assert.assertEquals("", arrayUtil.join(new int[] {}, "-"));
        Assert.assertEquals("1", arrayUtil.join(new int[] {1}, "-"));
        Assert.assertEquals("1-2-8-3-4-5", arrayUtil.join(new int[] {1, 2, 8, 3, 4, 5}, "-"));

	}

}