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LargestNumberSolverTest.java
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LargestNumberSolverTest.java
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package assign04;
import static org.junit.jupiter.api.Assertions.*;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.Vector;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
/**
* Overall JUnit tester for the LargestNumberSolver class
*
* @author Kyle Williams, Nils Streedain
* @version February 17, 2021
*/
class LargestNumberSolverTest {
private Integer[] emptyIntegerArray;
private String[] emptyStringArray;
private ArrayList<Integer[]> emptyArrayList;
private ArrayList<Integer[]> largeArrayList;
private ArrayList<Integer[]> arrayListWithEmptyIntegerArrays;
private ArrayList<Integer[]> plainArrayList;
private LinkedList<Integer[]> plainLinkedList;
private Vector<Integer[]> plainVector;
@BeforeEach
void setUp() throws Exception {
plainArrayList = new ArrayList<>();
plainArrayList.add(new Integer[] { 3, 3, 3 });
plainArrayList.add(new Integer[] { 2, 2, 2 });
plainArrayList.add(new Integer[] { 1, 1, 1 });
plainLinkedList = new LinkedList<>();
plainLinkedList.add(new Integer[] { 3, 3, 3 });
plainLinkedList.add(new Integer[] { 2, 2, 2 });
plainLinkedList.add(new Integer[] { 1, 1, 1 });
plainVector = new Vector<>();
plainVector.add(new Integer[] { 3, 3, 3 });
plainVector.add(new Integer[] { 2, 2, 2 });
plainVector.add(new Integer[] { 1, 1, 1 });
emptyArrayList = new ArrayList<>();
largeArrayList = new ArrayList<>();
for (int i = 0; i < 100; i++)
largeArrayList.add(new Integer[] { i, i, i });
arrayListWithEmptyIntegerArrays = new ArrayList<>();
arrayListWithEmptyIntegerArrays.add(new Integer[] { 3, 3, 3 });
arrayListWithEmptyIntegerArrays.add(new Integer[0]);
arrayListWithEmptyIntegerArrays.add(new Integer[] { 2, 2, 2 });
arrayListWithEmptyIntegerArrays.add(new Integer[0]);
arrayListWithEmptyIntegerArrays.add(new Integer[] { 1, 1, 1 });
}
// -------------------------------------------------- insertionSort method tests --------------------------------------------------
// Tests insertionSort() for an empty Integer array
@Test
void insertionSortEmpty() {
emptyIntegerArray = new Integer[0];
LargestNumberSolver.insertionSort(emptyIntegerArray, (o1, o2) -> o1 - o2);
assertArrayEquals(new Integer[0], emptyIntegerArray);
}
// Tests insertionSort for an Integer array with two elements
@Test
void insertionSortTwoValues() {
emptyIntegerArray = new Integer[] { 1, 0 };
LargestNumberSolver.insertionSort(emptyIntegerArray, (o1, o2) -> o1 - o2);
assertArrayEquals(new Integer[] { 0, 1 }, emptyIntegerArray);
}
// Tests insertionSort for an Integer array with five elements
@Test
void insertionSortFiveValues() {
emptyIntegerArray = new Integer[] { 3, 2, 4, 1, 0 };
LargestNumberSolver.insertionSort(emptyIntegerArray, (o1, o2) -> o1 - o2);
assertArrayEquals(new Integer[] { 0, 1, 2, 3, 4 }, emptyIntegerArray);
}
// Tests insertionSort for an Integer array with five elements using the
// finLargestNumber lambda expression
@Test
void insertionSortFiveLinearValues() {
emptyIntegerArray = new Integer[] { 0, 4, 2, 1, 3 };
LargestNumberSolver.insertionSort(emptyIntegerArray,
(o1, o2) -> Integer.valueOf("" + o2 + o1) - Integer.valueOf("" + o1 + o2));
assertArrayEquals(new Integer[] { 4, 3, 2, 1, 0 }, emptyIntegerArray);
}
// Test insertionSort for an Integer array with five of the same elements
@Test
void insertionSortSameValues() {
emptyIntegerArray = new Integer[] { 0, 0, 0, 0, 0 };
LargestNumberSolver.insertionSort(emptyIntegerArray, (o1, o2) -> o1 - o2);
assertArrayEquals(new Integer[] { 0, 0, 0, 0, 0 }, emptyIntegerArray);
}
// Tests insertionSort for an Integer array with 1000 elements
@Test
void insertionSortLargeArray() {
emptyIntegerArray = new Integer[1000];
for (int i = 0; i < 1000; i++)
emptyIntegerArray[i] = 999 - i;
LargestNumberSolver.insertionSort(emptyIntegerArray, (o1, o2) -> o1 - o2);
assertEquals(999, emptyIntegerArray[999]);
}
@Test
void insertionSortStringLengthArray() {
emptyStringArray = new String[] {"4444", "333", "1", "22"};
LargestNumberSolver.insertionSort(emptyStringArray, (o1, o2) -> o1.length() - o2.length());
assertArrayEquals(new String[] {"1", "22", "333", "4444"}, emptyStringArray);
}
@Test
void insertionSortStringLexArray() {
emptyStringArray = new String[] {"c", "a", "b"};
LargestNumberSolver.insertionSort(emptyStringArray, (s1, s2) -> s1.compareTo(s2));
assertArrayEquals(new String[] {"a", "b", "c"}, emptyStringArray);
}
// -------------------------------------------------- findLargestNumber() method tests --------------------------------------------------
// Tests findLargestNumber for empty array
@Test
void findLargestNumberEmptyArray() {
emptyIntegerArray = new Integer[] { 0 };
assertEquals(new BigInteger("0"), LargestNumberSolver.findLargestNumber(emptyIntegerArray));
}
// Tests findLargestNumber for an array with two elements
@Test
void findLargestNumberSmallArray() {
emptyIntegerArray = new Integer[] { 0, 1 };
assertEquals(new BigInteger("10"), LargestNumberSolver.findLargestNumber(emptyIntegerArray));
}
// Tests findLargestNumber for an array with five elements
@Test
void findLargestNumberMedArray() {
emptyIntegerArray = new Integer[] { 1, 2, 3, 4, 5 };
assertEquals(new BigInteger("54321"), LargestNumberSolver.findLargestNumber(emptyIntegerArray));
}
// Tests findLargestNumber for an array with twenty elements
@Test
void findLargestNumberLargeArray() {
emptyIntegerArray = new Integer[20];
for (int i = 0; i < 20; i++)
emptyIntegerArray[i] = i + 1;
assertEquals(new BigInteger("9876543220191817161514131211110"), LargestNumberSolver.findLargestNumber(emptyIntegerArray));
}
// -------------------------------------------------- findLargestInt() method tests --------------------------------------------------
// Tests findLargestInt for empty array
@Test
void findLargestIntEmptyArray() {
emptyIntegerArray = new Integer[] { 0 };
assertEquals(0, LargestNumberSolver.findLargestInt(emptyIntegerArray));
}
// Tests findLargestInt for an array with two elements
@Test
void findLargestIntSmallArray() {
emptyIntegerArray = new Integer[] { 0, 1 };
assertEquals(10, LargestNumberSolver.findLargestInt(emptyIntegerArray));
}
// Tests findLargestInt for an array with five elements
@Test
void findLargestIntMedArray() {
emptyIntegerArray = new Integer[] { 1, 2, 3, 4, 5 };
assertEquals(54321, LargestNumberSolver.findLargestInt(emptyIntegerArray));
}
// Test findLargestInt for an array past the bounds of int
@Test
void findLargestIntErr() {
emptyIntegerArray = new Integer[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 };
assertThrows(OutOfRangeException.class, () -> {
LargestNumberSolver.findLargestInt(emptyIntegerArray);
});
}
// -------------------------------------------------- findLargestLong() method tests --------------------------------------------------
// Tests findLargestLong for empty array
@Test
void findLargestLongEmptyArray() {
emptyIntegerArray = new Integer[] { 0 };
assertEquals(0, LargestNumberSolver.findLargestLong(emptyIntegerArray));
}
// Tests findLargestLong for an array with two elements
@Test
void findLargestLongSmallArray() {
emptyIntegerArray = new Integer[] { 0, 1 };
assertEquals(10, LargestNumberSolver.findLargestLong(emptyIntegerArray));
}
// Tests findLargestLong for an array with five elements
@Test
void findLargestLongMedArray() {
emptyIntegerArray = new Integer[] { 1, 2, 3, 4, 5 };
assertEquals(54321, LargestNumberSolver.findLargestLong(emptyIntegerArray));
}
// Tests findLargestLong for an array past the bounds of long
@Test
void findLargestLongErr() {
emptyIntegerArray = new Integer[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 };
assertThrows(OutOfRangeException.class, () -> {
LargestNumberSolver.findLargestLong(emptyIntegerArray);
});
}
// ------------------------------------------------------- sum() method tests -------------------------------------------------------
// Tests sum with an ArrayList containing 3 Integer arrays of 3 elements
@Test
void sumSmallArrayList() {
assertEquals(new BigInteger("666"), LargestNumberSolver.sum(plainArrayList));
}
// Tests sum with a LinkedList containing 3 Integer arrays of 3 elements
@Test
void sumSmallLinkedList() {
assertEquals(new BigInteger("666"), LargestNumberSolver.sum(plainLinkedList));
}
// Tests sum with a Vector containing 3 Integer arrays of 3 elements
@Test
void sumSmallVector() {
assertEquals(new BigInteger("666"), LargestNumberSolver.sum(plainVector));
}
// Tests sum with an empty Integer ArrayList
@Test
void sumEmptyArrayList() {
assertEquals(new BigInteger("0"), LargestNumberSolver.sum(emptyArrayList));
}
// Tests sum with a large Integer ArrayList
@Test
void sumLargeArrayList() {
assertEquals(new BigInteger("49550400"), LargestNumberSolver.sum(largeArrayList));
}
// Tests sum with a an ArrayList containing some empty Integer arrays
@Test
void sumTooShortArrayList() {
assertEquals(new BigInteger("666"), LargestNumberSolver.sum(arrayListWithEmptyIntegerArrays));
}
// -------------------------------------------------- findKthLargest() method tests --------------------------------------------------
// Tests findKth with an ArrayList containing 3 Integer arrays of 3 elements
@Test
void findKthSmallArrayList() {
assertArrayEquals(new Integer[] { 3, 3, 3 }, LargestNumberSolver.findKthLargest(plainArrayList, 0));
}
// Tests findKth with a LinkedList containing 3 Integer arrays of 3 elements
@Test
void findKthSmallLinkedList() {
assertArrayEquals(new Integer[] { 3, 3, 3 }, LargestNumberSolver.findKthLargest(plainLinkedList, 0));
}
// Tests findKth with a Vector containing 3 Integer arrays of 3 elements
@Test
void findKthSmallVector() {
assertArrayEquals(new Integer[] { 3, 3, 3 }, LargestNumberSolver.findKthLargest(plainVector, 0));
}
// Tests finKth with an empty Integer ArrayList
@Test
void findKthEmptyArrayList() {
assertThrows(IllegalArgumentException.class, () -> {
LargestNumberSolver.findKthLargest(emptyArrayList, 0);
});
}
// Tests findKth with a an ArrayList containing an empty Integer
@Test
void findKthArrayListEmptyIntArray() {
emptyArrayList.add(new Integer[0]);
assertArrayEquals(new Integer[0], LargestNumberSolver.findKthLargest(emptyArrayList, 0));
}
// Tests findKth with a large Integer ArrayList
@Test
void findKthLargeArrayList() {
assertArrayEquals(new Integer[] { 99, 99, 99 }, LargestNumberSolver.findKthLargest(largeArrayList, 0));
}
// Tests last value of findKth with a large Integer ArrayList
@Test
void findLastKthLargeArrayList() {
assertArrayEquals(new Integer[] { 0, 0, 0 }, LargestNumberSolver.findKthLargest(largeArrayList, 99));
}
// Tests findKth with a an ArrayList containing some empty Integer arrays
@Test
void findKthTooShortArrayList() {
assertArrayEquals(new Integer[] { 3, 3, 3 },
LargestNumberSolver.findKthLargest(arrayListWithEmptyIntegerArrays, 0));
}
// -------------------------------------------------- readFile() method tests --------------------------------------------------
// Tests readFile by inputting the file and confirming three indexes
@Test
void readFileArrayList() {
ArrayList<Integer[]> file = (ArrayList<Integer[]>) LargestNumberSolver.readFile("src/assign04/integers.txt");
assertArrayEquals(new Integer[] { 88, 51 }, file.get(7));
assertArrayEquals(new Integer[] { 92, 89, 39, 7, 21 }, file.get(13));
assertArrayEquals(new Integer[] { 21, 75, 100, 99 }, file.get(739));
}
// Test readFile by inputting an invalid file and expecting an empty array
@Test
void readFileNoFile() {
ArrayList<Integer[]> file = (ArrayList<Integer[]>) LargestNumberSolver.readFile("");
assertEquals(new ArrayList<Integer[]>(), file);
}
// Test readFile by inputting an invalid file and expecting an empty file
@Test
void readFileEmptyFile() {
ArrayList<Integer[]> file = (ArrayList<Integer[]>) LargestNumberSolver.readFile("src/assign04/empty.txt");
assertEquals(new ArrayList<Integer[]>(), file);
}
}