import static org.junit.Assert.*;
import org.junit.Test;
import java.util.ArrayList;

/**
 * Tester for lab02
 */

/**
 * @author rachelcardell-oliver
 *
 */
public class lab02Test {

	double delta = 0.00001; //error tolerance for doubles
	
	
	/**
	 * Test method for normal case of {@link lab02#sum(double[])}.
	 */
	@Test
	public void testSumNormal() {
		double testarr[] = {0.5, 1.5, 0.3, -1.0, 43.0, 1.0};
		assertEquals(45.3,lab02.sum(testarr),delta);
	}
	
	/**
	 * Test method for boundary case of {@link lab02#sum(double[])}.
	 * Question: or should this throw an exception
	 */
	@Test
	public void testSumEmpty() {
		double testarr[] = {};
		assertEquals(0.0,lab02.sum(testarr),delta);
	}
	
	/**
	 * Test method for exceptional case of {@link lab02#sum(double[])}.
	 * when all values are negative
	 */
	@Test
	public void testSumNeg() {
		double testarr[] = {-1,-2,-3};
		assertEquals(-6.0,lab02.sum(testarr),delta);
	}

	/**
	 * Test method for {@link lab02#average(double[])}.
	 */
	@Test
	public void testAverageNormal() {
		double testarr[] = {0.5, 1.5, -1.0, 43.0, 1.0};
		assertEquals(9.0,lab02.average(testarr),delta);
	}

	/**
	 * Test method for {@link lab02#mode(double[])}.
	 */
	@Test
	public void testModeNormal() {
		double testarr[] = {3,4,6,4,7,8,9,4,4};
		assertEquals(4.0,lab02.mode(testarr),delta);
	}
	
	/**
	 * Test method for {@link lab02#mode(double[])}.
	 */
	@Test
	public void testModeTies() {
		double testarr[] = {5,3,4,6,4,5,7,8,9,5,4};
		assertTrue((4.0 == lab02.mode(testarr)) || (5.0 == lab02.mode(testarr)));
	}

	/**
	 * Test method for {@link lab02#stddev(double[])}.
	 */
	@Test
	public void testStddev() {
		double testarr[] = {3,4,6,4,7,8,9,4,4};
		assertEquals(4.0247,lab02.stddev(testarr),delta);
	}
	
	/**
	 * Test method for {@link lab02#startsWith( String [ ] arr, char ch )}.
	 * ArrayList<String> startsWith( String [ ] arr, char ch )
	 */
	@Test
	public void testStartsWithNormal() {
		String[] wordlist = {"once","upon","a","time","there","lived","a","toad"};
		ArrayList<String> resarr = lab02.startsWith(wordlist,'t');

		assertTrue(resarr.get(0).equals("time"));
		assertTrue(resarr.get(1).equals("there"));
		assertTrue(resarr.get(2).equals("toad"));
	}
	
	/**
	 * Test method for {@link lab02#startsWith( String [ ] arr, char ch )}.
	 * ArrayList<String> startsWith( String [ ] arr, char ch )
	 */
	@Test
	public void testStartsWithNone() {
		String[] wordlist = {"once","upon","a","time","there","lived","a","friendly","toad"};
		ArrayList<String> resarr = lab02.startsWith(wordlist,'s');

		assertEquals(0,resarr.size());
	}

}