Updated the project to use JUnit 5 instead of JUnit 4

build.gradle

@@ -31,10 +31,6 @@ dependencies {
     compile 'com.google.code.gson:gson:2.8.0'
     compile group: 'org.apache.commons', name: 'commons-collections4', version: '4.0'
 
-//    TODO: to remove Junit4 after all tests are migrated to Junit5
-    compile 'junit:junit:4.13'
-    testCompile "junit:junit:4.13.1"
-
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.1'
     testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1'
 

src/test/java/com/fishercoder/firstthousand/_100Test.java

@@ -3,20 +3,20 @@
 import com.fishercoder.common.classes.TreeNode;
 import com.fishercoder.common.utils.TreeUtils;
 import com.fishercoder.solutions.firstthousand._100;
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
 import java.util.Arrays;
 
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class _100Test {
-    private static _100.Solution1 solution1;
+    private _100.Solution1 solution1;
     private static TreeNode p;
     private static TreeNode q;
 
-    @BeforeClass
-    public static void setup() {
+    @BeforeEach
+    public void setup() {
         solution1 = new _100.Solution1();
     }
 

src/test/java/com/fishercoder/firstthousand/_101Test.java

@@ -6,18 +6,18 @@
 
 import java.util.Arrays;
 
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class _101Test {
-    private static _101.Solution1 solution1;
-    private static _101.Solution2 solution2;
+    private _101.Solution1 solution1;
+    private _101.Solution2 solution2;
     private static TreeNode root;
 
-    @BeforeClass
-    public static void setup() {
+    @BeforeEach
+    public void setup() {
         solution1 = new _101.Solution1();
         solution2 = new _101.Solution2();
     }

src/test/java/com/fishercoder/firstthousand/_102Test.java

@@ -4,17 +4,17 @@
 import com.fishercoder.common.utils.CommonUtils;
 import com.fishercoder.common.utils.TreeUtils;
 import com.fishercoder.solutions.firstthousand._102;
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
 import java.util.Arrays;
 
 public class _102Test {
-    private static _102.Solution1 solution1;
+    private _102.Solution1 solution1;
     private static TreeNode treeRoot;
 
-    @BeforeClass
-    public static void setup() {
+    @BeforeEach
+    public void setup() {
         solution1 = new _102.Solution1();
     }
 

src/test/java/com/fishercoder/firstthousand/_103Test.java

@@ -4,17 +4,17 @@
 import com.fishercoder.common.utils.CommonUtils;
 import com.fishercoder.common.utils.TreeUtils;
 import com.fishercoder.solutions.firstthousand._103;
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
 import java.util.Arrays;
 
 public class _103Test {
-    private static _103.Solution1 solution1;
+    private _103.Solution1 solution1;
     private static TreeNode root;
 
-    @BeforeClass
-    public static void setup() {
+    @BeforeEach
+    public void setup() {
         solution1 = new _103.Solution1();
     }
 

src/test/java/com/fishercoder/firstthousand/_104Test.java

@@ -6,18 +6,18 @@
 
 import java.util.Arrays;
 
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class _104Test {
-    private static _104.Solution1 solution1;
-    private static _104.Solution2 solution2;
+    private _104.Solution1 solution1;
+    private _104.Solution2 solution2;
     private static TreeNode root;
 
-    @BeforeClass
-    public static void setup() {
+    @BeforeEach
+    public void setup() {
         solution1 = new _104.Solution1();
         solution2 = new _104.Solution2();
     }

src/test/java/com/fishercoder/firstthousand/_105Test.java

@@ -6,20 +6,20 @@
 
 import java.util.Arrays;
 
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
-import static junit.framework.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class _105Test {
-    private static _105.Solution1 solution1;
+    private _105.Solution1 solution1;
     private static TreeNode expected;
     private static TreeNode actual;
     private static int[] preorder;
     private static int[] inorder;
 
-    @BeforeClass
-    public static void setup() {
+    @BeforeEach
+    public void setup() {
         solution1 = new _105.Solution1();
     }
 

src/test/java/com/fishercoder/firstthousand/_106Test.java

@@ -3,23 +3,23 @@
 import com.fishercoder.common.classes.TreeNode;
 import com.fishercoder.common.utils.TreeUtils;
 import com.fishercoder.solutions.firstthousand._106;
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
 import java.util.Arrays;
 
-import static junit.framework.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class _106Test {
-    private static _106.Solution1 solution1;
-    private static _106.Solution2 solution2;
+    private _106.Solution1 solution1;
+    private _106.Solution2 solution2;
     private static TreeNode expected;
     private static TreeNode actual;
     private static int[] inorder;
     private static int[] postorder;
 
-    @BeforeClass
-    public static void setup() {
+    @BeforeEach
+    public void setup() {
         solution1 = new _106.Solution1();
         solution2 = new _106.Solution2();
     }

src/test/java/com/fishercoder/firstthousand/_107Test.java

@@ -4,17 +4,17 @@
 import com.fishercoder.common.utils.CommonUtils;
 import com.fishercoder.common.utils.TreeUtils;
 import com.fishercoder.solutions.firstthousand._107;
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
 import java.util.Arrays;
 
 public class _107Test {
-    private static _107.Solution1 solution1;
+    private _107.Solution1 solution1;
     private static TreeNode root;
 
-    @BeforeClass
-    public static void setup() {
+    @BeforeEach
+    public void setup() {
         solution1 = new _107.Solution1();
     }
 

src/test/java/com/fishercoder/firstthousand/_108Test.java

@@ -2,15 +2,15 @@
 
 import com.fishercoder.common.utils.TreeUtils;
 import com.fishercoder.solutions.firstthousand._108;
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
 public class _108Test {
-    private static _108.Solution1 solution1;
+    private _108.Solution1 solution1;
     private static int[] nums;
 
-    @BeforeClass
-    public static void setup() {
+    @BeforeEach
+    public void setup() {
         solution1 = new _108.Solution1();
     }
 

src/test/java/com/fishercoder/firstthousand/_109Test.java

@@ -11,7 +11,7 @@
 import java.util.Arrays;
 
 public class _109Test {
-    private static _109.Solution1 solution1;
+    private _109.Solution1 solution1;
     private static ListNode head;
     private static TreeNode expected;
 

src/test/java/com/fishercoder/firstthousand/_10Test.java

@@ -7,7 +7,7 @@
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class _10Test {
-    private static _10.Solution1 solution1;
+    private _10.Solution1 solution1;
 
     @BeforeEach
     public void setup() {

src/test/java/com/fishercoder/firstthousand/_110Test.java

@@ -3,20 +3,20 @@
 import com.fishercoder.common.classes.TreeNode;
 import com.fishercoder.common.utils.TreeUtils;
 import com.fishercoder.solutions.firstthousand._110;
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
 import java.util.Arrays;
 
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class _110Test {
-    private static _110.Solution1 solution1;
-    private static _110.Solution2 solution2;
+    private _110.Solution1 solution1;
+    private _110.Solution2 solution2;
     private static TreeNode treeNode;
 
-    @BeforeClass
-    public static void setup() {
+    @BeforeEach
+    public void setup() {
         solution1 = new _110.Solution1();
         solution2 = new _110.Solution2();
     }

src/test/java/com/fishercoder/firstthousand/_113Test.java

@@ -3,24 +3,24 @@
 import com.fishercoder.common.classes.TreeNode;
 import com.fishercoder.common.utils.TreeUtils;
 import com.fishercoder.solutions.firstthousand._113;
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class _113Test {
-    private static _113.Solution1 solution1;
-    private static _113.Solution2 solution2;
+    private _113.Solution1 solution1;
+    private _113.Solution2 solution2;
     private static TreeNode root;
     private static int sum;
     private static List<List<Integer>> expected;
 
-    @BeforeClass
-    public static void setup() {
+    @BeforeEach
+    public void setup() {
         solution1 = new _113.Solution1();
         solution2 = new _113.Solution2();
     }

src/test/java/com/fishercoder/firstthousand/_114Test.java

@@ -3,17 +3,17 @@
 import com.fishercoder.common.classes.TreeNode;
 import com.fishercoder.common.utils.TreeUtils;
 import com.fishercoder.solutions.firstthousand._114;
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
 import java.util.Arrays;
 
 public class _114Test {
-  private static _114.Solution1 solution1;
+  private _114.Solution1 solution1;
   private static TreeNode root;
 
-  @BeforeClass
-  public static void setup() {
+  @BeforeEach
+    public void setUp() {
     solution1 = new _114.Solution1();
   }
 

src/test/java/com/fishercoder/firstthousand/_115Test.java

@@ -1,16 +1,16 @@
 package com.fishercoder.firstthousand;
 
 import com.fishercoder.solutions.firstthousand._115;
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class _115Test {
-  private static _115.Solution1 solution1;
+  private _115.Solution1 solution1;
 
-  @BeforeClass
-  public static void setup() {
+  @BeforeEach
+    public void setUp() {
     solution1 = new _115.Solution1();
   }
 

src/test/java/com/fishercoder/firstthousand/_116Test.java

@@ -5,9 +5,9 @@
 import org.junit.jupiter.api.Test;
 
 public class _116Test {
-    private static _116.Solution1 solution1;
-    private static _116.Solution2 solution2;
-    private static _116.Node root;
+    private _116.Solution1 solution1;
+    private _116.Solution2 solution2;
+    private _116.Node root;
 
     @BeforeEach
     public void setup() {

src/test/java/com/fishercoder/firstthousand/_117Test.java

@@ -1,15 +1,15 @@
 package com.fishercoder.firstthousand;
 
 import com.fishercoder.solutions.firstthousand._117;
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
 public class _117Test {
-    private static _117.Solution1 solution1;
-    private static _117.Node root;
+    private _117.Solution1 solution1;
+    private _117.Node root;
 
-    @BeforeClass
-    public static void setup() {
+    @BeforeEach
+    public void setup() {
         solution1 = new _117.Solution1();
     }