What is a Data Driven Testing?

Essentially, data driven testing is when we test the same behavior multiple times with different parameters and assertions. A classic example of this would be testing a mathematical operation such as squaring a number. Depending on the various permutations of operands, the result will be different. In Java, the term we may be more familiar with is parameterized testing.


Rest: quick start web app using maven and jersey

Below lines works wonder using maven, creates web app structure and pull all dependencies.

mvn archetype:generate -DarchetypeGroupId=org.glassfish.jersey.archetypes -DarchetypeArtifactId=jersey-quickstart-webapp -DarchetypeVersionId=2.16

Groovy: Multi threaded producer consumer program

import java.util.concurrent.BlockingQueue
import java.util.concurrent.LinkedBlockingQueue

BlockingQueue queue = new LinkedBlockingQueue();

Thread.start('Producer') {
    10.times {
        println(Thread.currentThread().name + " adding $it")
        queue << it

Thread.start('Consumer') {
    for(i in 0..9){
        println("consuming ${queue.take()}")

Groovy: Closure Composition

Closure composition corresponds to the concept of function composition, that is to say creating a new function by composing two or more functions (chaining calls), as illustrated in this example:

def plus2  = { it + 2 }
def times3 = { it * 3 }

def times3plus2 = plus2 << times3
assert times3plus2(3) == 11
assert times3plus2(4) == plus2(times3(4))

def plus2times3 = times3 << plus2
assert plus2times3(3) == 15
assert plus2times3(5) == times3(plus2(5))

// reverse composition
assert times3plus2(3) == (times3 >> plus2)(3)


SDK MAN – Software Development Kit Manager

I use sdk man to maintain multiple versions of Groovy, Java, Scala. It makes switching very easy.

SDKMAN! is a tool for managing parallel versions of multiple Software Development Kits on most Unix based systems. It provides a convenient Command Line Interface (CLI) and API for installing, switching, removing and listing Candidates. Formerly known as GVM the Groovy enVironment Manager, it was inspired by the very useful RVM and rbenv tools, used at large by the Ruby community.

Installing SDKMAN! on UNIX-like platforms is as easy as ever. SDKMAN! installs smoothly on Mac OSX, Linux, Cygwin, Solaris and FreeBSD. We also support Bash and ZSH shells.
Simply open a new terminal and enter:

$ curl -s "https://get.sdkman.io" | bash

Follow the instructions on-screen to complete installation.
Next, open a new terminal or enter:

$ source "$HOME/.sdkman/bin/sdkman-init.sh"

Lastly, run the following code snippet to ensure that installation succeeded:

$ sdk version

If all went well, the version should be displayed. Something like:

  sdkman 5.0.0+51

Architecture: Bridge Design Pattern

Hi Friends,
I have made a project of “Remote Control Application” by implementing Bridge design pattern.

Project: Solves the problem of dependency / coupling between parallel development / evolution of 2 different components by creating a bridge between their interfaces 😉

What is Bridge Design Pattern: decouples an abstraction so two classes can vary independently

Github project code: https://github.com/premaseem/DesignPatternsJava9/tree/bridge-pattern

I have written the working code based on the Architectural diagram, which can be downloaded from Github.


Bridge Design Pattern class diagram.png