Java/src/test/java/com/thealgorithms/others/ArrayRotationTest.java at ced68c89a699599d417aaa5941a8d6273d7b5fac · TheAlgorithms/Java · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
package com.thealgorithms.others;

import static org.junit.jupiter.api.Assertions.assertArrayEquals;

import org.junit.jupiter.api.Test;

public class ArrayRotationTest {

    @Test
    void shouldRotateArrayRightByTwoPositions() {
        int[] values = {1, 2, 3, 4, 5};

        ArrayRotation.rotateRight(values, 2);

        assertArrayEquals(new int[] {4, 5, 1, 2, 3}, values);
    }

    @Test
    void shouldRotateArrayLeftByTwoPositions() {
        int[] values = {1, 2, 3, 4, 5};

        ArrayRotation.rotateLeft(values, 2);

        assertArrayEquals(new int[] {3, 4, 5, 1, 2}, values);
    }

    @Test
    void shouldHandleRotationGreaterThanArrayLength() {
        int[] values = {10, 20, 30, 40};

        ArrayRotation.rotateRight(values, 6);

        assertArrayEquals(new int[] {30, 40, 10, 20}, values);
    }

    @Test
    void shouldHandleLeftRotationGreaterThanArrayLength() {
        int[] values = {10, 20, 30, 40};

        ArrayRotation.rotateLeft(values, 6);

        assertArrayEquals(new int[] {30, 40, 10, 20}, values);
    }

    @Test
    void shouldKeepSingleElementArrayUnchanged() {
        int[] values = {99};

        ArrayRotation.rotateLeft(values, 5);

        assertArrayEquals(new int[] {99}, values);
    }

    @Test
    void shouldHandleEmptyArrayWithoutErrors() {
        int[] values = {};

        ArrayRotation.rotateRight(values, 3);

        assertArrayEquals(new int[] {}, values);
    }

    @Test
    void shouldReturnOriginalArrayWhenRotationIsZero() {
        int[] values = {7, 8, 9};

        ArrayRotation.rotateLeft(values, 0);

        assertArrayEquals(new int[] {7, 8, 9}, values);
    }

    @Test
    void shouldHandleNegativeRotation() {
        int[] values = {1, 2, 3, 4, 5};

        ArrayRotation.rotateRight(values, -2);

        assertArrayEquals(new int[] {3, 4, 5, 1, 2}, values);
    }
}