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

/**
 * The test class FunctionsTest.
 *
 * @author  (your name)
 * @version (a version number or a date)
 */
public class FunctionsTest
{
    /**
     * Default constructor for test class FunctionsTest
     */
    public FunctionsTest()
    {
    }

    /**
     * Sets up the test fixture.
     *
     * Called before every test case method.
     */
    @Before
    public void setUp()
    {
    }

    /**
     * Tears down the test fixture.
     *
     * Called after every test case method.
     */
    @After
    public void tearDown()
    {
    }

    @Test
    public void testAdd() {
        // : Given
        double expected = 17.0;
        double first = 9;
        double second = 8;
        // : When
        double actual = Functions.add(first, second);

        // : Then
        assertEquals(expected, actual, 0);
    }

    @Test
    public void testSubtract() {
        // : Given
        double expected = 17.0;
        double first = 40;
        double second = 23;
        // : When
        double actual = Functions.subtract(first, second);

        // : Then
        assertEquals(expected, actual, 0);
    }

    @Test
    public void testMultiply() {
        // : Given
        double expected = 72.0;
        double first = 9;
        double second = 8;
        // : When
        double actual = Functions.multiply(first, second);

        // : Then
        assertEquals(expected, actual, 0);
    }

    @Test
    public void testDivide() {
        // : Given
        double expected = 1.125;
        double first = 9;
        double second = 8;
        // : When
        double actual = Functions.divide(first, second);

        // : Then
        assertEquals(expected, actual, 0);
    }

    @Test
    public void testSquare() {
        // : Given
        double expected = 144.0;
        double input = 12;
        // : When
        double actual = Functions.square(input);

        // : Then
        assertEquals(expected, actual, 0);
    }

    @Test
    public void testSqRoot() {
        // : Given
        double expected = 12.0;
        double first = 144;

        // : When
        double actual = Functions.squareRoot(first);

        // : Then
        assertEquals(expected, actual, 0);
    }

    @Test
    public void testExponent() {
        // : Given
        double expected = 43046721.0;
        double first = 9;
        double second = 8;
        // : When
        double actual = Functions.exponent(first, second);

        // : Then
        assertEquals(expected, actual, 0);
    }

    @Test
    public void testInverse() {
        // : Given
        double expected = 0.25;
        double first = 4;

        // : When
        double actual = Functions.inverse(first);

        // : Then
        assertEquals(expected, actual, 0);
    }

    @Test
    public void testInvert() {
        // : Given
        double expected = -17.0;
        double first = 17;

        // : When
        double actual = Functions.invertSign(first);

        // : Then
        assertEquals(expected, actual, 0);
    }
    
    final double pi = Math.PI;
    
    @Test
    public void testSin() {
        // : Given
        double expected = 1.0;
        double first = 90;
        
        // : When
        double actual = Functions.sin(first);

        // : Then
        assertEquals(expected, actual, 0);
    }
    

    @Test
    public void testCos() {
        // : Given
        double expected = 1.0;
        double first = 0;
        
        // : When
        double actual = Functions.cos(first);

        // : Then
        assertEquals(expected, actual, 0);
    }

    @Test
    public void testTan() {
        // : Given
        double expected = 1.0;
        double first = 45;
        
        // : When
        double actual = (float)Functions.tan(first);

        // : Then
        assertEquals(expected, actual, 0.1);
    }

    @Test
    public void testArcsin() {
        // : Given
        double expected = 90.0;
        double first = 1;

        // : When
        double actual = Functions.arcsin(first);

        // : Then
        assertEquals(expected, actual, 0);
    }

    @Test
    public void testArccos() {
        // : Given
        double expected = 90.0;
        double first = 0;

        // : When
        double actual = Functions.arccos(first);

        // : Then
        assertEquals(expected, actual, 0);
    }

    @Test
    public void testArctan() {
        // : Given
        double expected = 45.0;
        double first = 1;

        // : When
        double actual = Functions.arctan(first);

        // : Then
        assertEquals(expected, actual, 0);
    }

    @Test
    public void testCsc() {
        // : Given
        double expected = Math.sqrt(2);
        double first = 45;

        // : When
        double actual = Functions.csc(first);

        // : Then
        assertEquals(expected, actual, 0);
    }

    @Test
    public void testSec() {
        // : Given
        double expected = (float)Math.sqrt(2);
        double first = 45;
        
        // : When
        double actual = (float)Functions.sec(first);

        // : Then
        assertEquals(expected, actual, 0);
    }

    @Test
    public void testCot() {
        // : Given
        double expected = 1.0;
        double first = 45;

        // : When
        double actual = (float)Functions.cot(first);

        // : Then
        assertEquals(expected, actual, 0);
    }

    @Test
    public void testLn() {
        // : Given
        double expected = 0.0;
        double first = 1;

        // : When
        double actual = Functions.ln(first);

        // : Then
        assertEquals(expected, actual, 0);
    }

    @Test
    public void testinverseLn() {
        // : Given
        double expected = 17.0;
        double first = 17;

        // : When
        double actual = Functions.inverseLn(first);

        // : Then
        assertEquals(expected, actual, 0);
    }
}