@Test
public void sumUsingRecursion() {
assertThat(arrayOperations.sumUsingRecursion(null), is(0));
assertThat(arrayOperations.sumUsingRecursion(new int[] {}), is(0));
assertThat(arrayOperations.sumUsingRecursion(new int[] {1}), is(1));
assertThat(arrayOperations.sumUsingRecursion(new int[] {1, 4, 5, 8}), is(18));
}
@Test
public void sumUsingStreams() throws Exception {
assertThat(arrayOperations.sumUsingStreams(null), is(0));
assertThat(arrayOperations.sumUsingStreams(new int[] {}), is(0));
assertThat(arrayOperations.sumUsingStreams(new int[] {1}), is(1));
assertThat(arrayOperations.sumUsingStreams(new int[] {1, 4, 5, 8}), is(18));
}
@Test
public void mergeArrays() {
assertThat(arrayOperations.mergeArrays(null, null), is(new int[0]));
assertThat(arrayOperations.mergeArrays(null, new int[0]), is(new int[0]));
assertThat(arrayOperations.mergeArrays(new int[0], null), is(new int[0]));
assertThat(arrayOperations.mergeArrays(null, new int[] {2, 3}), is(new int[] {2, 3}));
assertThat(arrayOperations.mergeArrays(new int[] {2, 3}, null), is(new int[] {2, 3}));
assertThat(arrayOperations.mergeArrays(new int[0], new int[] {2, 3}), is(new int[] {2, 3}));
assertThat(arrayOperations.mergeArrays(new int[] {2, 3}, new int[0]), is(new int[] {2, 3}));
assertThat(arrayOperations.mergeArrays(new int[] {14}, new int[] {33}), is(new int[] {14, 33}));
assertThat(arrayOperations.mergeArrays(new int[] {27}, new int[] {10}), is(new int[] {10, 27}));
assertThat(
arrayOperations.mergeArrays(new int[] {14, 33}, new int[] {10, 27}),
is(new int[] {10, 14, 27, 33}));
assertThat(
arrayOperations.mergeArrays(new int[] {19, 35}, new int[] {42, 44}),
is(new int[] {19, 35, 42, 44}));
assertThat(
arrayOperations.mergeArrays(
new int[] {10, 14, 27, 33},
new int[] {
19, 35, 42, 44,
}),
is(new int[] {10, 14, 19, 27, 33, 35, 42, 44}));
}
@Test
public void sortArrayUsingMergeSort() {
int[] emptyArrayOfNumbers = new int[] {};
assertThat(arrayOperations.sortArrayUsingMergeSort(emptyArrayOfNumbers), is(new int[] {}));
int[] oneElementArray = new int[] {1};
assertThat(arrayOperations.sortArrayUsingMergeSort(oneElementArray), is(new int[] {1}));
int[] twoElementArray = new int[] {4, -5};
assertThat(arrayOperations.sortArrayUsingMergeSort(twoElementArray), is(new int[] {-5, 4}));
int[] sortedArray = new int[] {-1, 0, 1};
assertThat(arrayOperations.sortArrayUsingMergeSort(sortedArray), is(new int[] {-1, 0, 1}));
int[] unsortedArray = new int[] {1000, 10000, 0, 10, -100000};
assertThat(
arrayOperations.sortArrayUsingMergeSort(unsortedArray),
is(new int[] {-100000, 0, 10, 1000, 10000}));
}
@Test
public void numberOccurringOddNumberOfTimes() {
assertThat(arrayOperations.numberOccurringOddNumberOfTimes(null), is(-1));
assertThat(arrayOperations.numberOccurringOddNumberOfTimes(new int[0]), is(-1));
assertThat(arrayOperations.numberOccurringOddNumberOfTimes(new int[] {1, 1}), is(-1));
assertThat(arrayOperations.numberOccurringOddNumberOfTimes(new int[] {1, 2, 2}), is(1));
assertThat(arrayOperations.numberOccurringOddNumberOfTimes(new int[] {1, 1, 2, 3, 3}), is(2));
assertThat(
arrayOperations.numberOccurringOddNumberOfTimes(new int[] {1, 1, 2, 2, 3, 4, 5}), is(3));
assertThat(
arrayOperations.numberOccurringOddNumberOfTimes(new int[] {1, 1, 2, 2, 3, 3, 5, 5, 5}),
is(5));
}
@Test
public void numbersOccurringOddNumberOfTimes() throws Exception {
assertThat(arrayOperations.numbersOccurringOddNumberOfTimes(null), is(new int[0]));
assertThat(arrayOperations.numbersOccurringOddNumberOfTimes(new int[0]), is(new int[0]));
assertThat(arrayOperations.numbersOccurringOddNumberOfTimes(new int[] {1, 1}), is(new int[0]));
assertThat(
arrayOperations.numbersOccurringOddNumberOfTimes(new int[] {1, 2, 2}), is(new int[] {1}));
assertThat(
arrayOperations.numbersOccurringOddNumberOfTimes(new int[] {1, 1, 2, 3, 3}),
is(new int[] {2}));
assertThat(
arrayOperations.numbersOccurringOddNumberOfTimes(new int[] {1, 1, 2, 2, 3, 4, 5}),
is(new int[] {3, 4, 5}));
assertThat(
arrayOperations.numbersOccurringOddNumberOfTimes(new int[] {1, 1, 2, 2, 3, 3, 5, 5, 5}),
is(new int[] {5}));
}
@Test
public void findSumTuples() {
assertThat(arrayOperations.findSumTuples(null, 10), is(new int[0][]));
assertThat(arrayOperations.findSumTuples(new int[0], 10), is(new int[0][]));
assertThat(arrayOperations.findSumTuples(new int[0], -1), is(new int[0][]));
assertThat(arrayOperations.findSumTuples(new int[] {1, 2, 3}, 10), is(new int[0][]));
assertThat(arrayOperations.findSumTuples(new int[] {1, 2, 3}, -1), is(new int[0][]));
assertThat(arrayOperations.findSumTuples(new int[] {3, 5}, 8), is(new int[][] {{3, 5}}));
assertThat(
arrayOperations.findSumTuples(new int[] {1, 2, 4, -1}, 3),
is(new int[][] {{-1, 4}, {1, 2}}));
assertThat(
arrayOperations.findSumTuples(new int[] {1, 2, 3, 4, 5, 6, 7, 10, -2, -7}, 3),
is(new int[][] {{1, 2}, {-2, 5}, {-7, 10}}));
}
@Test
public void hasElement() {
assertFalse(arrayOperations.hasElement(null, 10));
assertFalse(arrayOperations.hasElement(new int[] {}, 10));
assertFalse(arrayOperations.hasElement(new int[] {4}, 10));
assertFalse(arrayOperations.hasElement(new int[] {4, 5}, 10));
assertFalse(arrayOperations.hasElement(new int[] {1, 4, 5, 10}, 20));
assertTrue(arrayOperations.hasElement(new int[] {4}, 4));
assertTrue(arrayOperations.hasElement(new int[] {-10, -5}, -10));
assertTrue(arrayOperations.hasElement(new int[] {-10, -5}, -5));
assertTrue(arrayOperations.hasElement(new int[] {-1, 4, 5, 10}, -1));
assertTrue(arrayOperations.hasElement(new int[] {1, 4, 5, 10}, 10));
assertTrue(arrayOperations.hasElement(new int[] {1, 4, 5, 10}, 1));
assertTrue(arrayOperations.hasElement(new int[] {1, 4, 5, 10}, 4));
assertTrue(arrayOperations.hasElement(new int[] {1, 4, 5, 10}, 5));
}