leetcode: RemoveElements: cover with tests

Author: unrealwork

src/main/java/com/leetcode/list/RemoveElements.java

@@ -4,7 +4,7 @@ public final class RemoveElements {
     private RemoveElements() {
     }
 
-    public ListNode removeElements(ListNode head, int val) {
+    public static ListNode removeElements(ListNode head, int val) {
         ListNode res = null;
         ListNode last = null;
         ListNode it = head;

src/test/java/com/leetcode/list/RemoveElementsTest.java

@@ -0,0 +1,22 @@
+package com.leetcode.list;
+
+import com.leetcode.array.IntArrayConverter;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.converter.ConvertWith;
+import org.junit.jupiter.params.provider.CsvSource;
+
+class RemoveElementsTest {
+
+    @ParameterizedTest
+    @CsvSource("'1,3,5,3,-1',3,'1,5,-1'")
+    void testRemoveElements(@ConvertWith(ListNodeConverter.class) ListNode list, int val,
+                            @ConvertWith(IntArrayConverter.class) int[] expected) {
+        ListNode actual = RemoveElements.removeElements(list, val);
+        int[] actualArray = ListNodeUtils.toCollection(actual)
+                .stream()
+                .mapToInt(Integer::intValue)
+                .toArray();
+        Assertions.assertArrayEquals(expected, actualArray);
+    }
+}