introduce Junit5

Author: fishercoder1534

build.gradle

@@ -35,10 +35,17 @@ dependencies {
     compile 'junit:junit:4.13'
     compile group: 'org.apache.commons', name: 'commons-collections4', version: '4.0'
     testCompile "junit:junit:4.13.1"
-    testCompile("org.assertj:assertj-core:3.11.1")
 
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.1'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1'
+
+    testCompile("org.assertj:assertj-core:3.11.1")
     compileOnly 'org.projectlombok:lombok:1.18.12'
     annotationProcessor 'org.projectlombok:lombok:1.18.12'
     testCompileOnly 'org.projectlombok:lombok:1.18.12'
     testAnnotationProcessor 'org.projectlombok:lombok:1.18.12'
 }
+
+test {
+    useJUnitPlatform()
+}

src/test/java/com/fishercoder/_2716Test.java

@@ -1,16 +1,17 @@
 package com.fishercoder;
 
 import com.fishercoder.solutions._2716;
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
-import static org.junit.Assert.assertEquals;
 
 public class _2716Test {
     private static _2716.Solution1 solution1;
 
-    @BeforeClass
-    public static void setup() {
+    @BeforeEach
+    public void setup() {
         solution1 = new _2716.Solution1();
     }