With more than 25 years in software development, Thomas is an independent consultant based in Stockholm, Sweden.

He has a Masters degree in Computer Science from the Royal Institute of Technology (KTH), Sweden's leading technical university. After graduation, Thomas also taught at KTH.

Thomas currently teaches Behaviour-Driven Development, BDD, with Aslak Hellesøy, the creator of Cucumber. Thomas has commit privileges on the open-source Cucumber project, and works in partnership with Cucumber Ltd. as well as Mozaic Works.

As a consultant, trainer, and developer Thomas has created value for many teams around Europe. For the last ten years, Thomas has been an invited conference speaker at GeeCON, I T.A.K.E. Unconference, and European Testing Conference on topics including software craftsmanship, clean code, test automation, and continuous deployment.

His blog at thinkcode.se/blog shares his obsessions with technical excellence, Test-Driven Development, TDD, and BDD.

Thomas tweets as @thomassundberg

Posts by Thomas

• TDD with an AI assistant, my perspective as a beginning practitioner — 2026-02-16
• Compare time with AssertJ — 2020-04-30
• Context switching in git — 2020-03-11
• Delegating writing unit tests — 2020-02-27
• Setting execution permission from git — 2020-01-31
• Jenkins configuration as code — 2019-12-23
• Two Jenkins jobs - one Jenkinsfile — 2019-11-26
• Test-Driven development is hard — 2019-10-31
• What is the size of a baby step? — 2019-05-18
• What is BDD? — 2019-04-24
• How to implement a Cucumber-JVM plugin — 2019-03-07
• Kubernetes service node port range — 2019-02-20
• A Jersey client supporting https — 2019-01-27
• Data tables in Cucumber 3 — 2018-06-30
• I T.A.K.E. Unconference 2018 — 2018-05-20
• What does BDD really stand for? — 2018-04-17
• Testing stage 2018 — 2018-03-26
• Getting started with Cucumber for JavaScript — 2018-02-07
• Languages supported by Cucumber-JVM — 2018-01-24
• Finding the Unknown Unknown — 2017-12-20
• Cucumber - tagging scenarios — 2017-10-26
• Test automation and Selenium: 4 rules for keeping your tests simple — 2017-09-28
• Sharing state between steps in Cucumber-JVM using Guice — 2017-08-16
• Gradle: setTestClassesDir(File) method has been deprecated — 2017-08-14
• Use the same language — 2017-07-25
• Sharing state between steps in Cucumber-JVM using Spring — 2017-06-24
• Gherkin scenarios - some good properties — 2017-05-29
• Organising scenarios and steps in Cucumber — 2017-04-28
• Sharing state between steps in Cucumber-JVM using PicoContainer — 2017-04-01
• Zero-downtime deployment with HAProxy as load balancer — 2017-03-29
• How do you create a good specification? — 2017-02-26
• What is the difference between a specification and a good specification? — 2017-01-30
• Cucumber and Gherkin are not about flexibility — 2016-12-04
• Creating confidence when testing — 2016-10-03
• Why should you care about quality? — 2016-09-01
• Creating technical debt is like gaining weight — 2016-08-06
• Gatling - a tool for load testing — 2016-08-04
• The Right Tool for the Job — 2016-07-25
• Cucumber Anti-Patterns — 2016-06-22
• Hamcrest, JUnit, Mockito, IntelliJ IDEA, Gradle, and java.lang.NoSuchMethodError: org.hamcrest.Matcher.describeMismatch — 2016-04-18
• Cucumber regular expression cheat sheet — 2016-04-02
• Where should you use Behaviour Driven Development, BDD? — 2016-03-26
• Dependencies between tests — 2016-03-25
• Comments are deodorant for your code — 2016-02-16
• Separation of concern when using Selenium — 2016-01-14
• Gradle and Cucumber-JVM — 2015-12-26
• Continuous deployment - a case study — 2015-12-23
• Expected exceptions — 2015-11-20
• Different asserts are good in different situations — 2015-11-06
• When is evolutionary design a good way to implement software? — 2015-10-27
• Conference do’s and don’ts — 2015-09-15
• RPM Cheat sheet — 2015-09-10
• YUM Cheat sheet — 2015-09-10
• Increase the available disk on a CentOS host maintained by Vagrant and VirtualBox — 2015-09-10
• Packaging a zip file from Java using Apache Commons compress — 2015-08-21
• Tell, don’t ask — 2015-07-17
• Include header and footer in a Mustache template — 2015-06-19
• Separating acceptance tests — 2015-04-29
• Stubbing a var arg method using Mockito — 2015-04-28
• A Gradle plugin written in Java — 2015-03-22
• Gall's law — 2015-02-28
• When is it automated? — 2015-02-28
• Which artifacts do you want when you build a system? — 2015-02-16
• BDD with Cucumber-JVM at GeeCON TDD 2015 — 2015-01-30
• How do you recruit a good developer? — 2014-12-31
• Hard code first — 2014-11-30
• Removing the auto generated class header in IntelliJ IDEA — 2014-10-24
• An email marketing system built using test first and Cucumber-JVM — 2014-10-23
• Making life easier with a multi module Maven project — 2014-09-20
• Run SSH from Java — 2014-08-27
• Cucumber-JVM Hello world with Gradle — 2014-08-24
• Comparing Maven and Gradle — 2014-07-02
• Cucumber data tables — 2014-06-30
• Cucumber-JVM Hello world — 2014-05-29
• Use Maven build directory in your plugin — 2014-05-21
• Passing non primitive objects as parameters to a unit test — 2014-04-24
• Why Cucumber? — 2014-03-30
• Scripting with Ruby and Maven — 2014-02-28
• Test automation — 2014-01-28
• Parametrised unit tests — 2013-12-28
• Resources — 2013-11-30
• System Under Specification, SUS — 2013-10-15
• How is a hero created? — 2013-09-30
• Is the parameter used? — 2013-07-31
• Hero culture and curling — 2013-06-30
• Change the binary path for a Windows service — 2013-05-16
• Teaching - the difference between a lecture and a conversation — 2013-04-02
• Embrace change or embrace uncertainty — 2013-03-02
• Maven - the simplest possible introduction? — 2013-02-24
• Take control of your time — 2013-01-31
• Test coverage - friend or foe? — 2012-12-18
• Cucumber-JVM - not just for testing GUIs — 2012-11-01
• Building the model — 2012-11-01
• A JSF web application — 2012-11-01
• A Wicket web application — 2012-11-01
• Building a Swing GUI — 2012-11-01
• A RESTFul Web Service — 2012-11-01
• A SOAP Web Service — 2012-11-01
• Conclusion — 2012-11-01
• Selenium WebDriver - the simplest possible start? — 2012-10-29
• All computer systems are equal — 2012-10-13
• JBoss Drools - a hello world example — 2012-10-11
• Test drive an implementation using an Executable Specification - revisited — 2012-09-28
• Want change and is willing to change — 2012-09-19
• Want change but don’t want to change — 2012-09-03
• Separating tests in Maven — 2012-08-21
• Performing an action when a test fails — 2012-07-08
• Pair Programing — 2012-06-15
• Adding a JUnit test template in IntelliJ IDEA — 2012-06-01
• Using Hibernate Second level cache in JBoss 5.1 — 2012-05-10
• Execute tests in random order — 2012-05-03
• Challenging requirements — 2012-04-02
• What is a good test? — 2012-03-08
• Test coverage in a multi module Maven project — 2012-02-18
• Missing ant-jsch.jar — 2012-01-16
• ssh from Ant — 2012-01-16
• How many train wrecks are lurking in your code? — 2011-12-30
• Testing a Web Service with SoapUI, JUnit, Maven and Cucumber — 2011-11-16
• The simplest possible solution — 2011-11-16
• Why separate test definitions from a driving JUnit class? — 2011-10-31
• Testing a web application with Selenium 2 — 2011-10-18
• Maven Java heap space — 2011-10-14
• Why isn’t my tests being executed? — 2011-10-06
• Test drive an implementation using an Executable Specification — 2011-09-16
• Test drive the implementation of a database layer — 2011-08-07
• What is the difference between i++ and ++i? — 2011-08-05
• Magic numbers — 2011-07-28
• Do not return null — 2011-07-28
• Install a 3:rd part lib in Maven — 2011-06-10
• A Generics example — 2011-05-22
• FEST Assert - a fluent interface for assertions — 2011-04-24
• Software craftsmanship and raising the bar — 2011-04-20
• Why should you use different technical practises when you develop software? — 2011-04-14
• Four rules of simple design — 2011-04-06
• What is you passion? — 2011-03-28
• Set working directory for your Jenkins continuous build server — 2011-03-07
• Create an executable jar from Maven — 2011-03-05
• Build is platform dependent — 2011-02-22
• Unmappable character for encoding UTF-8 — 2011-02-17
• Stating the obvious — 2011-02-14
• Maven and Antrun — 2011-02-11
• Failing Maven builds in Hudson — 2011-01-21
• Automatically integration test an ejb with Maven — 2010-12-21
• Parameterized JUnits tests — 2010-07-11
• Maven and JBoss ESB - Hello World — 2010-07-09
• Dependency injection — 2010-05-16
• How to convert a POJO to XML with JAXB — 2010-01-19
• HttpComponents - a great tool with great examples based on a future release — 2009-08-04
• Getting started with Continuous Integration — 2009-04-22
• Integration test a web application with Selenium — 2009-04-17
• Hibernate, Spring and Maven — 2009-04-09
• How can I create a simple web application using Spring MVC? — 2009-04-06