/*
 * Copyright (C) 2014 Pedro Vicente Gómez Sánchez.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.github.pedrovgs.problem39;

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

import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;

/**
 * @author Pedro Vicente Gómez Sánchez.
 */
public class MultiplyArrayElementsTest {

  private MultiplyArrayElements multiplyArrayElements;

  @Before public void setUp() {
    multiplyArrayElements = new MultiplyArrayElements();
  }

  @Test(expected = IllegalArgumentException.class) public void shouldNotAcceptNullArrays() {
    multiplyArrayElements.multiply(null);
  }

  @Test public void shouldSupportEmptyArrays() {
    int[] array = new int[0];

    int[] result = multiplyArrayElements.multiply(array);

    assertEquals(0, result.length);
  }

  @Test public void shouldDoNothingIfTheArrayWithJustOneElement() {
    int[] array = { 1 };

    int[] result = multiplyArrayElements.multiply(array);

    int[] expected = { 1 };
    assertArrayEquals(expected, result);
  }

  @Test public void shouldMultiplyEveryElementByTheRest() {
    int[] array = { 1, 2, 3 };

    int[] result = multiplyArrayElements.multiply(array);

    int[] expected = { 6, 3, 2 };
    assertArrayEquals(expected, result);
  }
}

Add some tests to problem 39