1+ package com .blankj .hard ._025 ;
2+ import com .blankj .structure .ListNode ;
3+ import org .hamcrest .CoreMatchers ;
4+ import org .junit .jupiter .api .Test ;
5+ import java .lang .ArithmeticException ;
6+ import java .util .List ;
7+
8+ import static org .junit .Assert .assertThat ;
9+ import static org .junit .jupiter .api .Assertions .*;
10+
11+ public class SolutionTest {
12+ Solution solution =new Solution ();
13+
14+ @ Test
15+ public void TestReverseKGroupsWithHeadNull_1 (){
16+ ListNode actual =solution .reverseKGroup (ListNode .createTestData ("[]" ), -1 );
17+ assertNull (actual );
18+ }
19+
20+
21+ @ Test
22+ public void TestReverseKGroupsWithHeadNull_2 (){
23+ ListNode actual =solution .reverseKGroup (ListNode .createTestData ("[]" ),0 );
24+ assertNull (actual );
25+ }
26+
27+
28+
29+
30+ @ Test
31+ public void TestReverseKGroupsWithHeadNull_3 (){
32+ ListNode actual =solution .reverseKGroup (ListNode .createTestData ("[]" ),1 );
33+ assertNull (actual );
34+ }
35+
36+ @ Test
37+ public void TestReverseKGroupWith_k_isZero ()throws Exception {
38+ try {
39+ ListNode actual =solution .reverseKGroup (ListNode .createTestData ("[1]" ),0 );
40+ fail ("Not throw exception" );
41+ }catch (Exception e ) {
42+ assertThat (e ,CoreMatchers .instanceOf (ArithmeticException .class ));
43+ assertEquals (e .getMessage (),"/ by zero" );
44+ }
45+ }
46+
47+ @ Test
48+ public void TestReverseKGroupWith_k_isN ()throws Exception {
49+ try {
50+ ListNode actual =solution .reverseKGroup (ListNode .createTestData ("[1]" ), -1 );
51+ fail ("Not throw exception" );
52+ }catch (Exception e ) {
53+ assertThat (e ,CoreMatchers .instanceOf (ArithmeticException .class ));
54+ assertEquals (e .getMessage (),"/ k must greater than 0" );
55+ }
56+ }
57+
58+ @ Test
59+ public void TestReverseKGroupsWith_k_ (){
60+ ListNode actual =solution .reverseKGroup (ListNode .createTestData ("[1]" ),1 );
61+ String actualString =actual .toString (actual );
62+ ListNode expect =ListNode .createTestData ("[1]" );
63+ String expectString =expect .toString (expect );
64+ assertEquals (expectString ,actualString );
65+ }
66+
67+ @ Test
68+ public void TestReverseKGroupsWith_k_greaterTh (){
69+ ListNode actual =solution .reverseKGroup (ListNode .createTestData ("[1]" ),2 );
70+ String actualString =actual .toString (actual );
71+ ListNode expect =ListNode .createTestData ("[1]" );
72+ String expectString =expect .toString (expect );
73+ assertEquals (expectString ,actualString );
74+ }
75+
76+ @ Test
77+ public void TestReverseKGroupsWith_k_isSmThanLengthOfListNode (){
78+ ListNode actual =solution .reverseKGroup (ListNode .createTestData ("[1,2,3]" ),2 );
79+ String actualString =actual .toString (actual );
80+ ListNode expect =ListNode .createTestData ("[2,1,3]" );
81+ String expectString =expect .toString (expect );
82+ assertEquals (expectString ,actualString );
83+ }
84+
85+ @ Test
86+ public void TestReverseKGroupsWith_k_isEqualToLength (){
87+ ListNode actual =solution .reverseKGroup (ListNode .createTestData ("[1,2,3]" ),3 );
88+ String actualString =actual .toString (actual );
89+ ListNode expect =ListNode .createTestData ("[3,2,1]" );
90+ String expectString =expect .toString (expect );
91+ assertEquals (expectString ,actualString );
92+ }
93+
94+ // public static void main(String[] args) {
95+ // Solution solution = new Solution();
96+ // ListNode actual = solution.reverseKGroup(ListNode.createTestData("[1,2,3,4,5,6,7,8]"), 3);
97+ // String actualString = actual.toString(actual);
98+ // ListNode expect = ListNode.createTestData("[3,2,1,6,5,4,7,8]");
99+ // String expectString = expect.toString(expect);
100+ // assertEquals(expectString, actualString);
101+ // assert
102+ // }
103+ }