/*
 * 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.problem56;

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

import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

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

  private IsRotationUsingIsSubstring isRotation;

  @Before public void setUp() {
    isRotation = new IsRotationUsingIsSubstring();
  }

  @Test(expected = IllegalArgumentException.class)
  public void shouldNotAcceptNullInstancesAsFirstParameter() {
    isRotation.check(null, "");
  }

  @Test(expected = IllegalArgumentException.class)
  public void shouldNotAcceptNullInstancesAsSecondParameter() {
    isRotation.check("", null);
  }

  @Test public void shouldReturnFalseIfS2IsNotRotationOfS1() {
    String s1 = "waterbottle";
    String s2 = "pedro";

    boolean result = isRotation.check(s1, s2);

    assertFalse(result);
  }

  @Test public void shouldReturnTrueIfS2IsNotRotationOfS1() {
    String s1 = "waterbottle";
    String s2 = "erbottlewat";

    boolean result = isRotation.check(s1, s2);

    assertTrue(result);
  }
}

Add some tests to problem 56
Add some tests to problem 56
