recover deleted JMH tests

update gradle and other third-party libs

build.gradle

@@ -1,8 +1,20 @@
-plugins {
-  // usage: gradle dependencyUpdates -Drevision=release
-  id "com.github.ben-manes.versions" version "0.20.0"
+
+buildscript {
+  repositories {
+    maven {
+      url "https://plugins.gradle.org/m2/"
+    }
+    jcenter()
+  }
+  dependencies {
+    classpath "me.champeau.gradle:jmh-gradle-plugin:0.5.0-rc-2"
+  }
 }
 
+plugins {
+  // usage: gradle dependencyUpdates -Drevision=release
+  id "com.github.ben-manes.versions" version "0.22.0"
+}
 apply plugin: 'java'
 apply plugin: 'eclipse'
 
@@ -14,6 +26,7 @@ subprojects {
 	apply plugin: 'eclipse'
 	apply plugin: 'maven'
 	apply plugin: 'maven-publish'
+	apply plugin: 'me.champeau.gradle.jmh'
 
 	// java compatibility version
 	sourceCompatibility = 10
@@ -31,9 +44,9 @@ subprojects {
 	uploadArchives {
 		repositories {
 			mavenDeployer {
-					if (!project.hasProperty('mavenDeployRepo')){
-							throw new IllegalStateException("Set the property 'mavenDeployRepo' to the repository URL. A good place is ~/.gradle/gradle.properties")
-					}
+				if (!project.hasProperty('mavenDeployRepo')){
+						throw new IllegalStateException("Set the property 'mavenDeployRepo' to the repository URL. A good place is ~/.gradle/gradle.properties")
+				}
 				repository(url: "${mavenDeployRepo}")
 				println "publishing to: ${mavenDeployRepo}"
 			}
@@ -52,16 +65,23 @@ subprojects {
 		
 	// dependencies that all sub-projects have 
 	dependencies {
-		testCompile 'org.junit.jupiter:junit-jupiter-api:5.4.2'
-    	testRuntime 'org.junit.jupiter:junit-jupiter-engine:5.4.2'
-    	testRuntime 'org.junit.platform:junit-platform-launcher:1.4.2' // needed by eclipse
+		testCompile 'org.junit.jupiter:junit-jupiter-api:5.5.1'
+    	testRuntime 'org.junit.jupiter:junit-jupiter-engine:5.5.1'
+    	testRuntime 'org.junit.platform:junit-platform-launcher:1.5.1' // needed by eclipse
 	}
 	
 	test {
 	    useJUnitPlatform()
 	}
+	
+	jmh {
+		//jvmArgsAppend = ""
+		resultFormat = "JSON"
+		//include = ['.*Union.*'] // include pattern (regular expression) for benchmarks to be executed
+		//exclude = ['some regular expression'] // exclude pattern (regular expression) for benchmarks to be executed
+	}
 }
 
 wrapper() {
-	gradleVersion = '5.4.1'
+	gradleVersion = '5.6'
 }