Skip to main content

Simple code: Acceptance tests

Acceptance test are a great tool to verify that the application or system works as expected from end to end. Sometimes these tests can be called as end-to-end tests but sometimes end-to-end tests have a different meaning. Another term to describe the same functionality is QA tests and a subset of acceptance tests is often referred as smoke tests.

The idea

The idea is to define a input and the expected output and once the system and all it's dependant services are running the whole system can be verified to work as expected. In a ideal world the acceptance tests would be implemented based on the acceptance criteria of the use case.

The implementation

Acceptance tests can and should be implemented in the code just like unit and integration tests are implemented. The acceptance tests don't neccessarily reside in the same code repository as the code but they can, depending on what's the need.

When a system is API the acceptance tests could be e.g. predefined HTTP requests with predefined responses. These type of tests could easily be implemented with any unit test library or with a help of tools like SoapUI or Postman.

When a system is a web application that's used via browser the tests could be a flow of navigating the application with a browser and verifying that the interactions work as expected. These type of tests can also be easily automated with tools like testcafe and cypress.
Similar tools exist for mobile applications.

Acceptance vs integration tests

Acceptance and integration tests seem very similar and they are. They do basically the same thing but they do it in a different environment. Where a integration test (my idea of a integration test) is executed as part of the systems automated tests in the developers computer and in the CI system the acceptance test is executed against a real system running in a real environment where all the dependant services are running on their own and we as developers aren't neccessarily controlling the system but just executing the tests and observing the behaviour. Acceptance tests can and should also be run automatically by the CI system

When to implement acceptance tests

Just like any other tests acceptance tests can be implemented at any phase of the development process. Sometimes acceptance tests are implemented by someone else than the developer of the system e.g. a QA/tester who's a expert in these type of tests.

One approach is to implement acceptance tests before any code is written. This enables the development of the system with a test driven approach that's called acceptance test driven development i.e. ATDD. Another form of this is called BDD i.e. behaviour driven development.

Next part

In the next part I'll be moving from testing to version control systems and the importance of work log.




Labels:
Location: Espoo, Finland

Popular posts from this blog

Simple code: Naming things

There are two hard things in programming and naming is one them. If you don't believe me ask Martin Fowler https://www.martinfowler.com/bliki/TwoHardThings.html . In this post I'll be covering some general conventions for naming things to improve readability and understandabilty of the code. There are lots of things that need a name in programming. Starting from higher abstractions to lower we need to name a project, API or library, we probably need to name the source code repository, when we get to the code we need to name our modules or packages, we give names to classes, objects, interfaces and in those we name our functions or methods and within those we name our variables. Overall a lot of things to name. TLDR; Basic rule There's a single basic convention to follow to achiveve better, more descriptive naming of things. Give it a meaningful name i.e. don't use shorthands like gen or single letter variables like a, x, z instead tell what it represents, what it does...
Read more

Simple code: Version control commits

Currently the most popular version control system is git and I'll be writing this based on git and it's functionalities and capabilities. Git is often seen as a way to enable distributed programming i.e. multiple programmers can work on the same code repository quite easily without disturbing each others work (much). In addition to that just like other VCS's it's also a log of work but to my experience that part is often unfortunately neglected. What I will be focusing this time is the log part because I think it deserves more attention. Why to create a meaningful log? The git log should consist from small meaningful changesets where each commit addresses a single problem. By dividing the log to small commits it enables resilient way of working. Being resilient enables simple and fast procedures to rollbacks, reviews, tags, branching etc. Lets say that a developer is implementing a REST API. The API needs a web layer that receives the HTTP requests, it probably has some...
Read more

Simple code extra: Readability examples

Seven ways to write the same code snippet  Here are eight ways to write the exactly same code. Some are easier to read than others and all are a variation of a code I've seen in a real code base. My personal favorite is #7, what's yours?  #1 One liner DAO.filter { it.name == "foo" }.map { it.company }.toSet() #2 two lines, three operations DAO.filter { it.name == "foo" }   .map { it.company }.toSet() #3 Evaluation on it's own line DAO.filter {   it.name == "foo" }.map { it.company }.toSet() #4 Each operation and evaluation on their own lines DAO.filter {   it.name == "foo" }.map { it.company } .toSet() #5 All function calls and evaluation on their own lines DAO   .filter {     it.name == "foo"   }.map { it.company }   .toSet() #6 Everything on it's own line DAO   .filter {     it.name == "foo"   }   .map { it.company }   .toSet() #7 All function calls on their own lines DAO   .filter {  i...
Read more