Update client tests

build.gradle

@@ -18,11 +18,19 @@ version '1.0-SNAPSHOT'
 sourceCompatibility = 1.8
 
 def grpc_java_version = '1.15.0'
+def junit_version = '5.3.1'
 
 tasks.withType(JavaCompile) {
     options.encoding = "UTF-8"
 }
 
+test {
+    useJUnitPlatform()
+//    testLogging {
+//        events "passed", "skipped", "failed"
+//    }
+}
+
 javadoc {
     source = sourceSets.main.allJava
     classpath = configurations.compile
@@ -60,5 +68,7 @@ dependencies {
     compile 'io.grpc:grpc-netty-shaded:' + grpc_java_version
     compile 'io.grpc:grpc-protobuf:' + grpc_java_version
     compile 'io.grpc:grpc-stub:' + grpc_java_version
-    testCompile group: 'junit', name: 'junit', version: '4.12'
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:' + junit_version
+    testImplementation 'org.junit.jupiter:junit-jupiter-params:' + junit_version
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:' + junit_version
 }