gistfile1.java

package cs417;

import static org.junit.Assert.*;

import java.util.ArrayList;
import java.util.Arrays;

import cs417.BuggleSort;

import org.junit.Before;
import org.junit.Test;


public class TestBuggleSort {
  private BuggleSort bs;

  @Before
	public void setUp() {
		bs = new BuggleSort();
	}
	
	// Test empty array (mode 0)
	@Test
	public void testEmpty0() {
		double[] array = new double[] {};
		double[] out_array = bs.buggleSort(array, 0);
		assertSorted(array, out_array, 0);
	}
	
	// Test single value array (mode 0)
	@Test
	public void testSingle0() {
		double[] array = new double[] {1};
		double[] out_array = bs.buggleSort(array, 0);
		assertSorted(array, out_array, 0);
	}
	
	// Test empty array (mode 1)
	@Test
	public void testEmpty1() {
		double[] array = new double[] {};
		double[] out_array = bs.buggleSort(array, 1);
		assertSorted(array, out_array, 1);
	}
	
	// Test single value array (mode 1)
	@Test
	public void testSingle1() {
		double[] array = new double[] {1};
		double[] out_array = bs.buggleSort(array, 1);
		assertSorted(array, out_array, 1);
	}
	
	// Tests array with negative values (mode 0)
	@Test
	public void testNegatives0(){
		double[] array = new double[] {1, -2, 4, -5, 10};
		double[] out_array = bs.buggleSort(array, 0);
		assertSorted(array, out_array, 0);
	}
	
	// Tests array with negative values (mode 1)
		@Test
		public void testNegatives1(){
			double[] array = new double[] {1, -2, 4, -5, 10};
			double[] out_array = bs.buggleSort(array, 1);
			assertSorted(array, out_array, 1);
		}
	
	// Tests that the original array was unaltered by the sort.
	@Test
	public void testUnchangedOriginal() {
		double[] array = new double[] {1, 3, 2};
		double[] same_array = new double[] {1, 3, 2};
		
		bs.buggleSort(array, 0);
		
		for (int i=0; i<array.length; i++) {
			assertTrue("The original array was altered", array[i] == same_array[i]);
		}
	}
	
	// Tests that it can handle duplicate values in mode 0
	@Test(timeout=3000)
	public void testWithDuplicates0() {
		double[] array = new double[] {3, 2, 2, 1, 4, 7, 5};
		double[] same_array = new double[] {3, 2, 2, 1, 4, 7, 5};
		double[] other = bs.buggleSort(array, 0);
		assertSorted(same_array, other, 0);
	}
	
	// Tests that it can handle duplicate values in mode 1
	@Test(timeout=3000)
	public void testWithDuplicates1() {
		double[] array = new double[] {3, 2, 2, 1, 4, 7, 5};
		double[] same_array = new double[] {3, 2, 2, 1, 4, 7, 5};
		double[] other = bs.buggleSort(array, 1);
		assertSorted(same_array, other, 1);
	}
	
	// Tests that the sorter can handle decimal values.
	@Test
	public void testDecimals() {
		double[] in_array = new double[] {1.1, 1.8, 2.4, 1.6, 0.4};
		double[] same_array = new double[] {1.1, 1.8, 2.4, 1.6, 0.4};
		double[] out_array = bs.buggleSort(in_array, 0);
		assertSorted(same_array, out_array, 0);
	}
	
	// Test large arrays (larger than 100 elements)
	@Test(timeout=1000)
	public void testLargeArray() {
		double[] in_array = new double [101];
		for (int i=0; i<101; i++) {
			in_array[i] = i;
		}
		double[] out_array = bs.buggleSort(in_array, 0);
	}
	
	
	public boolean assertSorted(double[] in_array, double[] out_array, int mode) {
		
		// Check that the arrays are the same length
		if (in_array.length != out_array.length) fail("Arrays have different lengths");
		
		// Check if the array is longer than one value.
		if (in_array.length < 2) return true;
		
		// Check that the array is in order
		double lastVal, value;
		for (int i=1; i<in_array.length; i++) {
			lastVal = out_array[i-1];
			value = out_array[i];
			if (mode == 0 && lastVal > value) fail("Sorted array not in correct order.");
			if (mode == 1 && lastVal < value) fail("Sorted array not in correct order.");
		}
		
		
		// Check that the arrays have the same objects.
		// This works by constructing an ArrayList out of one of the arrays, and then
		// checking that each value in the other array is in the ArrayList.  If it is
		// in the ArrayList, we remove it from the ArrayList so that we can account
		// for duplicates.
		Double test = new Double(1.5);
		ArrayList<Double> al = new ArrayList<Double>();
		for (int i=0; i<out_array.length; i++) {
			al.add(new Double(out_array[i]));
		}
		
		for (int i=0; i<in_array.length; i++) {
			if (!al.remove(in_array[i])) fail("Incorrect value in sorted array.");
		}
		
		return true;
	}
	
}