Added ArrayUtils class.

Author: javadev

src/test/java/com_github_leetcode/ArrayUtils.java

@@ -0,0 +1,22 @@
+package com_github_leetcode;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ArrayUtils {
+
+    private ArrayUtils() {
+    }
+
+    public static List<List<Integer>> getLists(int[][] expected) {
+        List<List<Integer>> expectedList = new ArrayList<>();
+        for (int[] value : expected) {
+            List<Integer> expectedItem = new ArrayList<>();
+            expectedList.add(expectedItem);
+            for (int item : value) {
+                expectedItem.add(item);
+            }
+        }
+        return expectedList;
+    }
+}

src/test/java/g0001_0100/s0077_combinations/SolutionTest.java

@@ -3,22 +3,13 @@
 import static org.hamcrest.CoreMatchers.equalTo;
 import static org.hamcrest.MatcherAssert.assertThat;
 
-import java.util.ArrayList;
-import java.util.List;
+import com_github_leetcode.ArrayUtils;
 import org.junit.Test;
 
 public class SolutionTest {
     @Test
     public void combine() {
         int[][] expected = {{1, 2}, {1, 3}, {1, 4}, {2, 3}, {2, 4}, {3, 4}};
-        List<List<Integer>> expectedList = new ArrayList<>();
-        for (int[] value : expected) {
-            List<Integer> expectedItem = new ArrayList<>();
-            expectedList.add(expectedItem);
-            for (int item : value) {
-                expectedItem.add(item);
-            }
-        }
-        assertThat(new Solution().combine(4, 2), equalTo(expectedList));
+        assertThat(new Solution().combine(4, 2), equalTo(ArrayUtils.getLists(expected)));
     }
 }

src/test/java/g0001_0100/s0078_subsets/SolutionTest.java

@@ -3,22 +3,13 @@
 import static org.hamcrest.CoreMatchers.equalTo;
 import static org.hamcrest.MatcherAssert.assertThat;
 
-import java.util.ArrayList;
-import java.util.List;
+import com_github_leetcode.ArrayUtils;
 import org.junit.Test;
 
 public class SolutionTest {
     @Test
     public void subsets() {
         int[][] expected = {{}, {1}, {1, 2}, {1, 2, 3}, {1, 3}, {2}, {2, 3}, {3}};
-        List<List<Integer>> expectedList = new ArrayList<>();
-        for (int[] value : expected) {
-            List<Integer> expectedItem = new ArrayList<>();
-            expectedList.add(expectedItem);
-            for (int item : value) {
-                expectedItem.add(item);
-            }
-        }
-        assertThat(new Solution().subsets(new int[] {1, 2, 3}), equalTo(expectedList));
+        assertThat(new Solution().subsets(new int[] {1, 2, 3}), equalTo(ArrayUtils.getLists(expected)));
     }
 }

src/test/java/g0001_0100/s0090_subsets_ii/SolutionTest.java

@@ -3,22 +3,13 @@
 import static org.hamcrest.CoreMatchers.equalTo;
 import static org.hamcrest.MatcherAssert.assertThat;
 
-import java.util.ArrayList;
-import java.util.List;
+import com_github_leetcode.ArrayUtils;
 import org.junit.Test;
 
 public class SolutionTest {
     @Test
     public void subsetsWithDup() {
         int[][] expected = {{1}, {1, 2}, {1, 2, 2}, {2}, {2, 2}, {}};
-        List<List<Integer>> expectedList = new ArrayList<>();
-        for (int[] value : expected) {
-            List<Integer> expectedItem = new ArrayList<>();
-            expectedList.add(expectedItem);
-            for (int item : value) {
-                expectedItem.add(item);
-            }
-        }
-        assertThat(new Solution().subsetsWithDup(new int[] {1, 2, 2}), equalTo(expectedList));
+        assertThat(new Solution().subsetsWithDup(new int[] {1, 2, 2}), equalTo(ArrayUtils.getLists(expected)));
     }
 }