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Test automation framework architecture. Part 2.2 - Two-layered architecture

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As we've learned in previous posts of the series - Layered (also known as Tiered) architecture is a de-facto standard of the industry.

There're two major variations of this architectural pattern that one should be aware of: 3-layered architecture (described here) and 2-layered architecture. This post is going to concentrate on 2-layered architecture.



2-layered architecture is typically seen in UI-specific test automation frameworks. The key feature of this pattern is absence of Business-layer, so most of business-related logic are actually to be put into Page Objects.

In order to avoid "The God class" anti-pattern and still be able to contain business-related logic in Page Object, one usually uses libraries or frameworks that allow to simplify DOM-elements location, thus letting Page Objects to concentrate less on locating elements and more on bsiness-logic itself.

The good thing in this architectural pattern is that it actually allows you to write less code (and let…

Agile, testing and more frequent deliveries.

Yet another time I think I see people using word Agile wrong. Yet another guy claimed "we need to have more predictability and stability so I think we would go for Agile methodologies, Scrum in particular".

Nonesense.

I don't think that "predictability, stability, whatevershitability" has anything to do with Agile. If you start Agile transformation with such goal you've already failed.
Agile is about maximizing value delivery rate in a state of uncertainty, that's pretty much what it is.

If your business is uncertain as hell why do you think that "predictability" with engineering teams is going to fix things? It is not.
Worse, if you make engineering teams predictable while having unpredictable environment, you will miss the whole point and make things worse while still thinking you're doing fine.

Nonesense.

Agile team is about removing management layers between engineering and customer, not making management happier.

Having an abi…

Test automation framework architecture. Part 2.1 - Layered architecture example

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Let's consider an example of what Layered (Tiered) architecture may look like for a test automation framework. As a system under test we're going to use this simple and neat "Todo list" application.

First let's do a brief analysis of the application. From my brief exploration I came up with the following check list:

  Area/Group    Things to check    Comments  Todos CRUD1 Create itemBasic scenario, UI-level case1.1 Create item with same nameCase is not valid. There's no validation for that - nothing to check really.1.2 Create item with empty/not valid/malicious nameWhile it would be nice thing to test manually, from test automation stand point I would expect this to be filtered on service or repository level, so either integration or unit test.2 Mark item completeBasic scenario, UI-level case2.1 Un-mark item completeBasic scenario, UI-level case3 Delete itemBasic scenario, UI-level case3.1 Delete item when there're multiple items with the same nameKnowing …

Why I would prefer writing 100 unit test to one UI test

Choosing between writing one UI tests and 100 Unit test I would always prefer second option. Why?

Well, I am actually lame with UI testing, but that not the main reason.

The only thing I worry about is speed. How fast we can change a software? Quality - I don't care about it much cause quality standards are contextual and can change. The only thing that is certain - there're going to be changes and we mostlikely don't know what those changes are about. So there's only one thing that matters - how fast we can adapt to this change.

Internal quality is something that actually makes us able to change fast. UI tests do not contribute to internal quality. UI tests may even make things worse.


That is the reason.


And I invite you to Testcon Moscow to talk about this more - I am going to present some more thoughts on this topic there.