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Model Common Understanding

The Art of Modelling series from Curiosity Software Learn how to use visual representations or models, to garner a common understanding of what your system process should look like.

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Scope and Articulate Flow

Decision gates laid down on the Test Modeller canvas serve to generate tests. These tests are based on coverage types. In this example, test generation results in four possible flows, which terminate in being able to make a perfect cup of tea or not.

In the video above, you’ll meet Huw Price (Managing Director, Curiosity Software). Huw will discuss the need to throw down a rough process flow to help articulate a series of data states as decision groups, ahead of starting to visually model. This approach favours seeing the bigger picture in which test steps can be agreed, modified and refined in the model amongst all stakeholders including testers, business users, SMEs, developers, SDETS, manual testers and likely end-users.


Be Mindful of Decision Gates

Use visual representations, to garner a common understanding of what the process should look like. What we're doing is we're visualising everything. So what we've had to do is actually double up with the Logic Gates in terms of wanting sugar and wanting milk. The reason we're doing, this is because we need to put it all into a visual representation. So once you've finished with your preliminary model, what you need to do then is to start thinking about creating some tests or user stories.

In this video, Huw Price introduces techniques that you can use to test every scenario along various paths of a model. This features ahead of the subsequent clip, which shows the use of Rules as a way of limiting the amount of possible scenarios, but equally how a mixed approach using Rules with Logic Gates can be used to inform best practice modelling when executing test steps.



Overlay Logic to Reduce Repetition

Where the previous clip introduced a fully visual model, Logic Gates though had to be repeated, which may be tricky to maintain. So Boolean states are a more embedded solution and though less overtly visualized - you have to look at the Boolean logic itself - if you're only interested in the User Stories or Test Cases, that's the way to go.

Finally, what you may find is to use a mixed approach where you're balancing the visual elements to make the model more understandable while overlaying complexity through Boolean logic states. This shows you a different way to solve the same problem, where we're going to use constraints or Boolean logic to overlay onto the model. 

And what we've done is add in a new endpoint called no tea. What you'll see is that we have a little hexagon here; we have some rules to find here. Associated with each block in the Assignment we've picked up, HaveTea Yes, HaveTea No, like so; and we've done that for each of the data states. You need to go in and define Rules; and we've created a very simple one here. So if any of these is not true, we cannot make a cup of tea.


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