The main motief of Lightening Talk (build.gradle to avoid slow test problem) written by @mike_neck

build.gradle

apply plugin: 'groovy'

repositories {
    mavenCentral()
}

dependencies {
    compile 'org.codehaus.groovy:groovy:1.8.1'
    testCompile 'junit:junit:4.9'
}

task deleteTest {
    dependsOn << clean
    'rm /Users/mike/IdeaProjects/GradleSlowTest/src/test/java/orz/mikeneck/gradle/slow/test/*.java'.execute()
}

task createTest(dependsOn : deleteTest) {
    'groovy /Users/mike/IdeaProjects/GradleSlowTest/script/CreateTest.groovy'.execute().text.eachLine { line ->
        println line
    }
}

test {
    maxParallelForks = 4
    forkEvery = 20
}

task slowTest {
    dependsOn << createTest
    dependsOn << test
}

CreateTest.groovy

/**
 * Created by IntelliJ IDEA.
 * User: mike
 * Date: 11/11/05
 * Time: 15:34
 * To change this template use File | Settings | File Templates.
 */
import static groovyx.gpars.GParsPool.*;

def path = '/Users/mike/IdeaProjects/GradleSlowTest/src/test/java/orz/mikeneck/gradle/slow/test'
def packagePath = path.replace('/Users/mike/IdeaProjects/GradleSlowTest/src/test/java/', '')

assert new File(path).isDirectory()

def head = $/package orz.mikeneck.gradle.slow.test;
import org.junit.Before;
import org.junit.Test;
import java.util.List;
import java.util.ArrayList;
import static org.hamcrest.CoreMatchers.*;
import static org.junit.Assert.*;
/$

def body =$/
    public static final int SIZE = 100;
    private List<Integer> intList;
    @Test
    public void test() throws InterruptedException {
        int number = 0;
        for (Integer i : intList) {
            assertThat(i, is(number++));
            Thread.sleep(10);
        }
    }
    @Before
    public void setUp() {
        intList = new ArrayList<Integer>();
        for (int i = 0; i <= SIZE; i++ ) {
            intList.add(i);
        }
    }
}
/$

def tests = []
(1..100).each {
    tests << it
}

withPool {
    tests.collectParallel {test ->
        def className = "GradleTest${test}"
        def name = "${className}.java"
        def fileName = "${path}/${name}"
        def define = "public class ${className} {"
        def contents = new StringWriter()
        contents << head
        contents << define
        contents << body
        println '----'
        println "creating ${fileName}"
        new File(fileName).write(contents.toString(), 'UTF-8')
        assert new File(fileName).exists()
    }
}