content: /*
   * Copyright 2015, The Android Open Source Project
   *
   * 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.example.android.testing.androidjunitrunnersample;
  
  import static com.google.common.truth.Truth.assertThat;
  
  import androidx.test.ext.junit.runners.AndroidJUnit4;
  import androidx.test.filters.SmallTest;
  
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  
  
  /**
   * JUnit4 unit tests for the calculator logic.
   */
  @RunWith(AndroidJUnit4.class)
  @SmallTest
  public class CalculatorTest {
  
      private Calculator mCalculator;
  
      @Before
      public void setUp() {
          mCalculator = new Calculator();
      }
  
      @Test
      public void addTwoNumbers() {
          double resultAdd = mCalculator.add(1d, 1d);
          assertThat(resultAdd).isEqualTo(2d);
      }
  
      @Test
      public void subTwoNumbers() {
          double resultSub = mCalculator.sub(1d, 1d);
          assertThat(resultSub).isEqualTo(0d);
      }
  
      @Test
      public void subWorksWithNegativeResult() {
          double resultSub = mCalculator.sub(1d, 17d);
          assertThat(resultSub).isEqualTo(-16d);
      }
  
      @Test
      public void divTwoNumbers() {
          double resultDiv = mCalculator.div(32d,2d);
          assertThat(resultDiv).isEqualTo(16d);
      }
  
      @Test(expected = IllegalArgumentException.class)
      public void divDivideByZeroThrows() {
          mCalculator.div(32d,0d);
      }
  
      @Test
      public void mulTwoNumbers() {
          double resultMul = mCalculator.mul(32d, 2d);
          assertThat(resultMul).isEqualTo(64d);
      }
  
  }