Parallel tests with Maven – Junit

Hello guys,

Today I will post about multithreading with Maven. We have some plugins which are able to do the thread safe in your tests:

  • Surefire offers a variety of options to execute tests in parallel, allowing you to make best use of the hardware at your disposal.

  • Forking in particular can also help keeping the memory requirements low.


How can you configure the test execution ?

One can impose thread-count limitations on suites, classes or methods using one or more of the parameters threadCountSuites, threadCountClasses and threadCountMethods. If only threadCount is specified, Surefire attempts to estimate the thread counts for suites, classes and methods and reuses the threads in favor of a leaf, e.g. parallel methods (possibly increasing concurrent methods).
In the next post I will do some tests with junit and testng, so I can talk more about this plugin with each framework, but for now you can see the example pages: JUnit and TestNG.

As an example with an unlimited number of threads, there is maximum of three concurrent threads to execute suites: parallel = all, useUnlimitedThreads = true, threadCountSuites = 3. In the second example the thread-counts represent a ratio, e.g. for parallel = all, threadCount = 16, threadCountSuites = 2, threadCountClasses = 3, threadCountMethods = 5. Thus the concurrent suites will be 20%, concurrent classes 30%, and concurrent methods 50%.
Finally, the threadCount and useUnlimitedThreads may not be necessarily configured if the equivalent thread-counts are specified for the value in parallel.
The parameters parallelTestsTimeoutInSeconds and parallelTestsTimeoutForcedInSeconds are used to specify an optional timeout in parallel execution. If the timeout is elapsed, the plugin prints the summary log with ERROR lines: “These tests were executed in prior to the shutdown operation”, and “These tests are incomplete” if the running Threads were interrupted.
The important thing to remember with the parallel option is: the concurrency happens within the same JVM process. That is efficient in terms of memory and execution time, but you may be more vulnerable towards race conditions or other unexpected and hard to reproduce behavior.

Parallel Test Execution and Single Thread Execution

As mentioned above the parallel test execution is used with specific thread count. Since of Surefire 2.18, you can apply the JCIP annotation @net.jcip.annotations.NotThreadSafe on the Java class of JUnit test (test class, Suite, Parameterized, etc.) in order to execute it in single Thread instance. The Thread has name “maven-surefire-plugin@NotThreadSafe“.
This way the parallel execution of tests classes annotated with @NotThreadSafe are forked in single thread instance (don’t mean forked JVM process).
If the Suite or Parameterized is annotated with @NotThreadSafe, the suite classes are executed in single thread. You can also annotate individual test class referenced by Suite, and the other unannotated test classes in the Suite can be subject to run in parallel.

Note: As designed by JUnit runners, the static methods annotated with @BeforeClass and @AfterClass are called in parent thread. Assign classes to the @NotThreadSafe Suite to prevent from this trouble.


Forked Test Execution


The parameter forkCount defines the maximum number of JVM processes that Surefire will spawn concurrently to execute the tests. It supports the same syntax as -T in maven-core: if you terminate the value with a ‘C’, that value will be multiplied with the number of available CPU cores in your system. For example forkCount=2.5C on a Quad-Core system will result in forking up to ten concurrent JVM processes that execute tests.

The parameter reuseForks: to reuse the processes to execute the next tests (reuseForks=true/false). The default setting is forkCount=1/reuseForks=true, which means that Surefire creates one new JVM process to execute all tests in one maven module. forkCount=1/reuseForks=false executes each test class in its own JVM process, one after another. You can use the place holder ${surefire.forkNumber} within argLine, or within the system properties (both those specified via mvn test -D... and via systemPropertyVariables).

The following is an example configuration that makes use of up to three forked processes that execute the tests and then terminate. A system property databaseSchema is passed to the processes, that shall specify the database schema to use during the tests. The values for that will be MY_TEST_SCHEMA_1, MY_TEST_SCHEMA_2, and MY_TEST_SCHEMA_3 for the three processes.
        <argLine>-Xmx1024m -XX:MaxPermSize=256m</argLine>

In case of a multi module project with tests in different modules, you could also use, say, mvn -T 2 ... to start the build, yielding values for ${surefire.forkNumber} ranging from 1 to 6.
By setting reuseForks=true, you can reuse the same context for consecutive tests. And as many tests tend to use and access the same test data, you can avoid database locks during the concurrent execution by using distinct but uniform database schemas.
As reuseForks=false creates a new JVM process for each test class, using parallel=classes would have no effect. You can still useparallel=methods, though.
When using reuseForks=true and a forkCount value larger than one, test classes are handed over to the forked process one-by-one. Thus, parallel=classes would not change anything. However, you can use parallel=methods: classes are executed in forkCountconcurrent processes, each of the processes can then use threadCount threads to execute the methods of one class in parallel.


In your pom.xml file:

Add ths surefire plugin.



After, you must set the parallel parameter, and may change thethreadCount or useUnlimitedThreads attribute.


As of Surefire 2.7, no additional dependencies are needed to use the full set of options with parallel. As of Surefire 2.16, new thread-count attributes are introduced, namely threadCountSuites, threadCountClasses and threadCountMethods. Additionally, the new attributes parallelTestsTimeoutInSeconds and parallelTestsTimeoutForcedInSeconds are used to shut down the parallel execution after an elapsed timeout, and the attribute parallel specifies new values.

Thank you guys ! Hope you can enjoy and search even more about this. I’ve just summarised what I think it’s more important to know about junit, maven and parallel tests 🙂

As always if you have some question, suggestion feel free to comment below. I will reply as soon as possible and if I don’t know I will find someone to help me reply to you. Have an excellent weekend everyone ! See you next week !

Code example to catch url, Status code and time to load an url

Hi guys, today I will post a simple project that I did just to catch some information with Selenium and Java. So, I have a spreadsheet with some urls in the first column and when I run the project, it is being recorded the status code of the urls and how long is lasting to load this page in the following columns.

It is very simples. I know that there are many ways to do that and you don’t need to use selenium because will take more time to render the page and everything, but maybe someone is needing something similar. So, now the code and in the bottom the link to my project.

  • OPEN URL – Open the URL and write the StatusCode and the time to load the page in the following columns:
import org.openqa.selenium.WebDriver;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.openqa.selenium.By;

public class OpenUrl {

    OpenDataBase opendatabase = new OpenDataBase();
    FileOutputStream fOut = null;

    public void OpenURL(WebDriver driver) throws BiffException, Exception {
        String tablename = ("tb");
        File file = new File("BD.xls");
        int result = 0;
        String STR = "CRI -";
        int ARQ = 1;
        int WARNING = 2;
        int CRITICAL = 3;

        Workbook wb = new HSSFWorkbook(new FileInputStream(file.

        for (int i = 0; i < opendatabase.sheet.getRows(); i++) {

            String url = opendatabase.sheet.getCell(0, i).getContents();

            double start = System.currentTimeMillis();
            double finish = System.currentTimeMillis();
            double totalTime = finish - start;
            double totalTimeSec = totalTime / 1000;

            try {
            } catch (Exception e) {

            String titlepage = driver.getTitle().replace(" ", "");

            FileWriter fw = new FileWriter(titlepage + ".txt");
            int statusCode = Statuscode(driver.getCurrentUrl(), driver);
            String line = url + "," + totalTimeSec + "," + statusCode;




    public int Statuscode(String URLName, WebDriver driver) {
        try {
            int statuscode = Integer.parseInt(driver.findElement(By.xpath
("/html/body/div/span/span/pre[2]")).getText().substring(9, 12));
            return statuscode;
        } catch (Exception e) {
            return 1;
  • OPEN DATABASE CODE – Read the columns in the Excel Spreadsheet:
import jxl.Sheet;
import jxl.Workbook;
import jxl.WorkbookSettings;

public class OpenDataBase{

    Sheet sheet;
    Workbook bdurl;
    public Sheet Open(String tablename) throws BiffException, IOException, 
Exception { 

        File file = new File("BD.xls");
            WorkbookSettings ws = new WorkbookSettings();
            bdurl = Workbook.getWorkbook(new File(file.getCanonicalPath()), 
            sheet = bdurl.getSheet(tablename);
            return sheet;

    public void Close(Workbook bdurl) throws BiffException, IOException, 
Exception {



  • MAIN CLASS – statusCode:
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.firefox.FirefoxProfile;
import java.util.concurrent.TimeUnit;
import org.openqa.selenium.firefox.internal.ProfilesIni;
import org.openqa.selenium.remote.CapabilityType;
import org.openqa.selenium.remote.DesiredCapabilities;

public class statusCode {

    public static void main(String[] args) throws Exception {
        ProfilesIni profilesIni = new ProfilesIni();
        FirefoxProfile profile = profilesIni.getProfile("default");
        WebDriver driver = new FirefoxDriver(profile);

        DesiredCapabilities capabilities = new DesiredCapabilities();
        capabilities.setCapability(CapabilityType.ACCEPT_SSL_CERTS, true);
        profile.setPreference("browser.ssl_override_behavior", 1);
        profile.setPreference("network.proxy.type", 0);

        driver.manage().timeouts().implicitlyWait(5, TimeUnit.SECONDS);

        OpenUrl Openurl = new OpenUrl();

Thanks guys ! See you next week, if you have any questions, suggestion please feel free to comment below.


BDD – Summarized in 13 questions/tips and 1 example

Hi guys, today I will post a summary of a meet up that I went about BDD. It was very interesting and more clear than the others texts/posts that I found about.

1 –  Communication with all teams (business, developers, tests since beginning) is the key – Everyone should participate.

2 – What is the value of the scenario ?

3 – Could you write in another way/different steps ?

4 – Could you use the same steps ?

5 – Could you join some steps in other scenario to spend less time when you run the feature ?

6 – Your flow is decreasing the possible points of misunderstood gaps ?

7 – Are you doing the scenarios with participation of everyone in the beginning of the project ? When everyone is understanding the same thing and you starts to worry about tests in the beginning of the project, you spend less time/money than write test cases after development. Pay attention in your flow.

8 – Be curious ! Ask !

9 – Everything should be automated ? Remember that the effort spent when you automate something can be less valuable than manual testing.

10 – How many steps are you using in the scenarios, try don’t use more than 4 or 5. Make it simple.

11 – Use page object model – Better structure

12 – Be clear and objective when write the steps

13 – The feature is your documentation for end users, testers, developers. Following one of the Scrum rules, you don’t need more than this in your documentation process. Less time spent, more clear than huge documents (Because it uses examples), keeps the documentation together with the test.

14 – Use 4 layers – Example :


Thanks John F. Smart !

Understanding encapsulation

This technique is used to hide an idea, when you don’t want expose the inter details to the users.

As a more technical example we can describe what happens in a sales system, where we have records of employees, users, managers, clients, and other products. If happens a problem in the user, only this sector will be fixed and does not affect the others.

In a process of encapsulating the attributes of the classes are kind of private. To access these types of modifiers, you must create getters and setters methods.

The methods setters are used to change the information of a property of an object, and getters to return the value of this property.

See an example of encapsulation, in Listing 2 creates the attributes private (private) and is carried out the process of generating getters and setters methods.



public class Funcionario {
    private double salario;
    private String nome;
    public String getNome() {
        return nome;
    public void setNome(String nome) {
        this.nome = nome;
    public void setSalario(double salario) {
        this.salario = salario;
    public double getSalario() {
        return salario;

So, is instantiated class “Employee”, where the variable reference is used to invoke methods setters, reporting any data. In the end, the getters is used within the “System.out.println” to output the results that were passed in the methods setters.


public class TestaFuncionario {
    public static void main(String[] args) {
        Funcionario funcionario = new Funcionario();

This is easy and helps you avoid pass a lot of parameters in methods, classes and functions.

Open saved profiles in Firefox – Selenium (WebDriver)

Hello, I will put the code that you need for open some saved profile in Firefox with Selenium.

ProfilesIni profilesIni = new ProfilesIni();
FirefoxProfile profile = profilesIni.getProfile(“default“); //This is the name of profile, you can find this in the folder of firefox profiles.
WebDriver driver = new FirefoxDriver(profile);
DesiredCapabilities capabilities = new DesiredCapabilities();
capabilities.setCapability(CapabilityType.ACCEPT_SSL_CERTS, true); // Only necessary if you have invalid certificates in the page
profile.setPreference(“network.proxy.type”, 0); // open without proxy
profile.setAcceptUntrustedCertificates(true); // Only necessary if you have invalid certificates in the page
profile.setAssumeUntrustedCertificateIssuer(false); // Only necessary if you have invalid certificates in the page
I use this way for open a saved profile that contains a personal certificate. I needed open 
a page with this certificate installed.
Bye bye 🙂

Turn on caps lock in Automation

Hello guys !

This is a simple command to turn on or turn off the caps lock during the automation

                                        .setLockingKeyState(KeyEvent.VK_CAPS_LOCK, true);


You have the change the bold word for on or off 🙂

Ok, that is all !

Bye !

Regular Expression for value of the money (Java)

Do you have to catch only the value of some value of money ?

Use this simple expression, just change the value R$ for the correct money that you need take out.

String preco = precoatual.getText();

String replace = “”;
Pattern pattern = Pattern.compile(“[^0-9&&[R$]]”);
Matcher matcher = pattern.matcher(preco);
preco = matcher.replaceAll(replace);

And if the value is: R$ 124,28 – The result will are: 124,28

Simple don’t ?

Bye bye !