add unit test for _025 solution

Author: Lanhbao

src/test/java/com/blankj/hard/_025/SolutionTest.java

@@ -0,0 +1,103 @@
+package com.blankj.hard._025;
+import com.blankj.structure.ListNode;
+import org.hamcrest.CoreMatchers;
+import org.junit.jupiter.api.Test;
+import java.lang.ArithmeticException;
+import java.util.List;
+
+import static org.junit.Assert.assertThat;
+import static org.junit.jupiter.api.Assertions.*;
+
+public class SolutionTest {
+    Solution solution = new Solution();
+
+    @Test
+    public void TestReverseKGroupsWithHeadNull_1(){
+        ListNode actual = solution.reverseKGroup(ListNode.createTestData("[]"), -1);
+        assertNull(actual);
+    }
+
+
+    @Test
+    public void TestReverseKGroupsWithHeadNull_2(){
+        ListNode actual = solution.reverseKGroup(ListNode.createTestData("[]"), 0);
+        assertNull(actual);
+    }
+
+
+
+
+    @Test
+    public void TestReverseKGroupsWithHeadNull_3(){
+        ListNode actual = solution.reverseKGroup(ListNode.createTestData("[]"), 1);
+        assertNull(actual);
+    }
+
+    @Test
+    public void TestReverseKGroupWith_k_isZero() throws Exception {
+        try {
+            ListNode actual = solution.reverseKGroup(ListNode.createTestData("[1]"), 0);
+            fail("Not throw exception");
+        } catch (Exception e) {
+            assertThat(e, CoreMatchers.instanceOf(ArithmeticException.class));
+            assertEquals(e.getMessage(), "/ by zero");
+        }
+    }
+
+    @Test
+    public void TestReverseKGroupWith_k_isN() throws Exception {
+        try {
+            ListNode actual = solution.reverseKGroup(ListNode.createTestData("[1]"), -1);
+            fail("Not throw exception");
+        } catch (Exception e) {
+            assertThat(e, CoreMatchers.instanceOf(ArithmeticException.class));
+            assertEquals(e.getMessage(), "/ k must greater than 0");
+        }
+    }
+
+    @Test
+    public void TestReverseKGroupsWith_k_(){
+        ListNode actual = solution.reverseKGroup(ListNode.createTestData("[1]"), 1);
+        String actualString = actual.toString(actual);
+        ListNode expect = ListNode.createTestData("[1]");
+        String expectString = expect.toString(expect);
+        assertEquals(expectString, actualString);
+    }
+
+    @Test
+    public void TestReverseKGroupsWith_k_greaterTh(){
+        ListNode actual = solution.reverseKGroup(ListNode.createTestData("[1]"), 2);
+        String actualString = actual.toString(actual);
+        ListNode expect = ListNode.createTestData("[1]");
+        String expectString = expect.toString(expect);
+        assertEquals(expectString, actualString);
+    }
+
+    @Test
+    public void TestReverseKGroupsWith_k_isSmThanLengthOfListNode(){
+        ListNode actual = solution.reverseKGroup(ListNode.createTestData("[1,2,3]"), 2);
+        String actualString = actual.toString(actual);
+        ListNode expect = ListNode.createTestData("[2,1,3]");
+        String expectString = expect.toString(expect);
+        assertEquals(expectString, actualString);
+    }
+
+    @Test
+    public void TestReverseKGroupsWith_k_isEqualToLength(){
+        ListNode actual = solution.reverseKGroup(ListNode.createTestData("[1,2,3]"), 3);
+        String actualString = actual.toString(actual);
+        ListNode expect = ListNode.createTestData("[3,2,1]");
+        String expectString = expect.toString(expect);
+        assertEquals(expectString, actualString);
+    }
+
+//    public static void main(String[] args) {
+//        Solution solution = new Solution();
+//        ListNode actual = solution.reverseKGroup(ListNode.createTestData("[1,2,3,4,5,6,7,8]"), 3);
+//        String actualString = actual.toString(actual);
+//        ListNode expect = ListNode.createTestData("[3,2,1,6,5,4,7,8]");
+//        String expectString = expect.toString(expect);
+//        assertEquals(expectString, actualString);
+//        assert
+//    }
+}