!define TEST_SYSTEM {fit:A}

!define TEST_SYSTEM {fit:A} 59

Posted by Brett Schuchert Tue, 04 Nov 2008 00:08:00 GMT

Uncle Bob has been busy with FitNesse lately. If you have been following him on Twitter or if you read his blog post on the subject, then you are aware of his work on Slim.

This post, however, is not about that. It is about something he did to make it possible to execute different tests in different VM’s.

By default, when you click on the test or suite buttons to run tests, FitNesse finds the tests it will run and executes them in a single VM.

If you want to select a particular test runner in FitNesse, you can add the following to a page:

                    !define TEST_SYSTEM {fit}
                  

Or you could add the following:

                    !define TEST_SYSTEM {slim}
                  

If you do not define this variable, then fit is the test system used to execute tests, making the first example redundant…almost.

These variable definitions are inherited. FitNesse will search up the page hierarchy to find variable definitions. If you do not define TEST_SYSTEM anywhere in a page’s hierarchy, then that test will be executed with fit. However, if any of the pages above the current page changed the runner to slim, then Slim will be the test runner.

The other thing that you can do is add a “logical-vm name” to the end of the runner. Here are two examples:

On some page

                    !define TEST_SYSTEM {fit:vm1}
                  

On a different page

                    !define TEST_SYSTEM {fit:vm2}
                  

All tests under the page containing the first define run in a vm with the logical name vm1. The same is true for vm2.

By default (i.e., you have not defined TEST_SYSTEM anywhere), all tests are run in the same vm. More precisely:

When you click the test button, all tests executed as a result of that button click run in one VM.
When you click the suite button, all tests executed as a result are executed in the same VM.

As soon as you introduce the TEST_SYSTEM variable, the tests might execute in the same VM or different VM’s.

Conceptually, there’s a default or unnamed VM under which all tests execute. As soon as a page contains a TEST_SYSTEM with the added :VMName syntax, that page and all pages hierarchically below it run in a different VM.

If for some reason you want to have two unrelated page hierarchies execute in the same VM, you can. Define the TEST_SYSTEM variable with the same logical VM name.

Why did he add this feature

I asked him to. He was working on that part of FitNesse so I figured he’d be able to add the feature for a project I’m working on.

It has to do with service-level testing of a SOA-based solution. If you’re interested in hearing about that and the rationale for adding this feature to FitNesse, let me know in the comments and I’ll describe the background.

Posted in Schuchert's Scattered Synapses
Tags FitNesse, isloation, runner, slim, test
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Scott Pfister 7 days later:

Brett—would be quite interested in hearing more about how you’re using Fitnesse and different VMs for doing service-level testing. We’re still deciding between Fitnesse, a Ruby DSL, or some internally developed alternatives for solving that problem.

—Scott
Brett L. Schuchert 7 days later:

Scott,

Will do. In a nutshell, however, each service runs as an EAR – under WebSphere in the case in question. Each EAR has its own class loader as a child to the WebShere extensions class loader (I think that’s it, it is about 5 levels deep if you count the root class loader as level 1) and as a sibling of all the other EARS.

So when you run M services in N EARs, you can load the “same” class N times. It might be the same byte codes or different. It doesn’t matter, the same class (by same, same fully-qualified name) loaded by different class loaders is considered a different class.

Different class loader -> different “namespace.”

Since FitNesse runs all classes under one classloader, it introduces dependencies that, when doing integration level testing, can cause unintended side-effects.

I’ll eventually write more, but does this give you a basic idea?
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