import static org.junit.Assert.*;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class MathUtilitiesTest
{
    private MathUtilities utilities;
    private static final double DELTA = 0.009;

    @Before
    public void setup(){
        utilities = new MathUtilities();
    }

    @Test
    public void testAddInteger(){
        //Given
        int expected = 15;

        //When
        int actual = utilities.add(7, 8);

        //Then
        assertEquals(expected, actual);
    }

    @Test
    public void testAddDouble(){
        //Given
        double expected = 11.22;

        //When
        double actual = utilities.add(10, 1.22);

        //Then
        assertEquals(expected, actual, DELTA);
    }

    @Test
    public void testHalfForEven(){
        //Given
        double expected = 2.0;

        //When
        double actual = utilities.half(4);

        //Then
        assertEquals(expected, actual, DELTA);
    }

    @Test
    public void testHalfForOdd(){
        //Given
        double expected = 12.5;

        //When
        double actual = utilities.half(25);

        //Then
        assertEquals(expected, actual, DELTA);
    }

    @Test
    public void testIsOddForOddNumber(){
        assertTrue(utilities.isOdd(7));
    }

    @Test
    public void testIsOddForEvenNumber(){
        assertFalse(utilities.isOdd(12));
    }

    @Test
    public void testSquareForBaseCase() {
      //Given
      int expected = 1;

      //When
      int actual = utilities.square(1);

      //Then
      assertEquals(expected, actual);
    }

    @Test
    public void testSquareForOneDigit() {
      //Given
      int expected = 9;

      //When
      int actual = utilities.square(3);

      //Then
      assertEquals(expected, actual);
    }

    @Test
    public void testSquareForTwoDigit() {
      //Given
      int expected = 121;

      //When
      int actual = utilities.square(11);

      //Then
      assertEquals(expected, actual);
    }
}