/*
 * The MIT License
 * Copyright © 2014-2019 Ilkka Seppälä
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package com.iluwatar.arrangeactassert;

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

import org.junit.Test;

/**
 * Arrange/Act/Assert (AAA) is a pattern for organizing unit tests. It is a way to structure your
 * tests so they're easier to read, maintain and enhance.
 *
 * <p>It breaks tests down into three clear and distinct steps:
 * <p>1. Arrange: Perform the setup and initialization required for the test.
 * <p>2. Act: Take action(s) required for the test.
 * <p>3. Assert: Verify the outcome(s) of the test.
 *
 * <p>This pattern has several significant benefits. It creates a clear separation between a test's
 * setup, operations, and results. This structure makes the code easier to read and understand. If
 * you place the steps in order and format your code to separate them, you can scan a test and
 * quickly comprehend what it does.
 *
 * <p>It also enforces a certain degree of discipline when you write your tests. You have to think
 * clearly about the three steps your test will perform. But it makes tests more natural to write at
 * the same time since you already have an outline.
 *
 * <p>In ({@link CashAAATest}) we have four test methods. Each of them has only one reason to
 * change and one reason to fail. In a large and complicated code base, tests that honor the single
 * responsibility principle are much easier to troubleshoot.
 */
public class CashAAATest {

  @Test
  public void testPlus() {
    //Arrange
    var cash = new Cash(3);
    //Act
    cash.plus(4);
    //Assert
    assertEquals(7, cash.count());
  }

  @Test
  public void testMinus() {
    //Arrange
    var cash = new Cash(8);
    //Act
    var result = cash.minus(5);
    //Assert
    assertTrue(result);
    assertEquals(3, cash.count());
  }

  @Test
  public void testInsufficientMinus() {
    //Arrange
    var cash = new Cash(1);
    //Act
    var result = cash.minus(6);
    //Assert
    assertFalse(result);
    assertEquals(1, cash.count());
  }

  @Test
  public void testUpdate() {
    //Arrange
    var cash = new Cash(5);
    //Act
    cash.plus(6);
    var result = cash.minus(3);
    //Assert
    assertTrue(result);
    assertEquals(8, cash.count());
  }
}