Thursday, 4 May 2017

Testing java slf4j over log4j logging in JUnit using SLF4J Test

Testing logging on failure paths has two problems:

  • It is hard to get the log message text
  • The logger outputs to the test log
The first leads to compromises eg verifying only that a message was logged, the second makes you, the programmer, think an error has occurred when the tests in fact passed.

Code to test

public class Sut { 
    public String perform() {
        getLog().debug("In perform");
        return "Hello world";

My clunky PowerMock Solution

My approach was problematic as it required the use of PowerMock which is as powerful as nitroglycerin.

Test Code

public class SutTest {

    public void testPerform() {
        Logger mockLog = mock(Logger.class);

        assertEquals("Hello world", new Sut().perform());
        verify(mockLog, times(1)).debug(startsWith("In perform"));

Elegant SLF4j Test Solution

The slf4j-test project by RobElliot266 provides a logger which stores messages and so can be asserted against.

POM Setup

Add the following to your dependencies


To ensure that this logger is used during tests only and that it takes precedence over the production logger in the test class path ensure the test logger is the first logger mentioned in the dependencies block and has a test scope.

As an additional measure you can explicitly exclude the production logger from the test class path:


Test Code

public class SutTest {
  public void testPerform() {
    assertEquals("Hello world", new Sut().perform());
    assertEquals("Testing", logger.getLoggingEvents().get(0).getMessage());

Much thanks to RobElliot266 for an neat solution to a problem that has been bugging me for a while.

Saturday, 18 March 2017

A stack chart of any CSV url

Stack chart.

Thursday, 15 December 2016

Migrate MelatiSite from CVS to github

Re-visiting (why did I not complete this at the time?)

Following How to export revision history from mercurial or git to cvs?

On hanuman I created an id file git_authors mapping cvs ids to github name, email format for all contributors:

timp=Tim Pizey<>
then create a repository on github (melati in this example, I already have uploaded my ssh public key for this machine)
cd ~
git cvsimport -d /usr/cvsroot -C MelatiSite -r cvs -k -A git_authors MelatiSite

cd melati
echo A jdbc to java object relational mapping system. 1999-2011 > README.txt
git add README.txt
git commit -m "Initial" README.txt
git remote add origin
git push -u origin master

Saturday, 14 May 2016

JaCoCo UnitTest and IntegrationTest Configuration Example

The number of ways in which Maven, Surefire, Failsafe, Jacoco, Selenium and Jetty can be mis-configured is enormous.

I have explored this space and honestly this is the only one which worked!

JaCoCo UnitTest and IntegrationTest Configuration Example on github with results on a Maven generated site.

Wednesday, 16 March 2016

CentOS setup on VirtualBox

Once you have Networking working there is still a long way to go.

yum groupinstall "Development Tools"
yum install kernel-devel
yum install kde-workspace
yum group install "X Window System"
yum groupinstall "Fonts" 
yum install gdm

Now we can login without a GUI but startx when one is needed.

Installing Guest Additions

The guest Centos is a stock distribution, you have to tell it that it is inside VirtualBox.

Make the additions visible to the guest:

In the "Devices" menu in the virtual machine's menu bar, VirtualBox has a handy menu item named "Insert Guest Additions CD image", which mounts the Guest Additions ISO file inside your virtual machine.

yum install dkms
mkdir -p /media/cdrom
# Note change from /dev/scd0 in CentOS6
mount /dev/sr0 /media/cdrom 
sh /media/cdrom/

We are now able to move the mouse seamlessly between our guest and host and window systems understand each other.

Sharing files between the host and guest

In the host (Windows) create C:\vbshared and using the VirtualBox interface share this with the guest. In the guest:

mkdir /vbshared
mount -t vboxsf vbshared /vbshared

it will be visible as /vbshared/ from inside the guest.

Enable networking in VirtualBox Centos Client

The CentOS 7 iso does not enable networking during the installation, unlike Ubuntu. So your shiny new CentOS cannot get to the outside world.

Based on Stack Overflow - CentOS 7 VirtualBox no internet access.

Add the following to /etc/sysconfig/network-scripts/ifcfg-enp0s3

# Note this was set to no

Friday, 4 March 2016

Current Software Development Pre-Requisites

When starting a new project or joining an existing one there are a number of tools and features which should be in place. I have ordered them in order both of importance and the order in which the global community learnt the painful lessons that none of these are optional.

This is based upon Project initiation - a recipe.

Short name

Google it, ensure it is available as a url, check twitter.


If there is no README create it now!

Source control

The only decision is public or private. It will be a git repo.

If any other SCM system is in place convert to git before doing anything else.

Decide on git usage strategy: git flow, release branches, developer forks with feature branches and merge to master.

Development machine

Do we really want to develop in Fortran under VMS? oh, OK.

Develop on the operating system you are deploying to. If you develop on OSX and deploy to debian it will bite you. Developing for Redhat using Windows should be made illegal.

Continuous Integration

Jenkins of course.

Track the code coverage, anything less than 100&percent; is not acceptable.

Static Analysis

For legacy projects Sonar establishes a baseline, for new projects it holds the line throughout the projects life.

Continuous Deployment

The closer to Continuous Deployment the fewer platform types are needed.


Metrics enable blue green deployment and A/B testing.

Issue tracking and work planning

Just you: gitthub, team: Jira