Setup and tear down

Fourth, the TearDown method is called to perform the common cleanup activities, and finally the instance is destroyed destructor called. Then, these five steps are performed for the next test method and so on. So much for the general idea of SetUp of TearDown. However, there are some things to keep in mind when implementing tests: Surely, SetUp and TearDown can help to reduce code duplication across tests. However, their use can lead to different kinds of problems:. Therefore, it can be beneficial to go for a different approach to reduce code duplication across test methods.

Instead of putting common code into SetUp and TearDown which are called implicitly by the test framework you can do the following: You create helper methods of your own that have easy-to-understand names, like "ensureTrafficLightIsGreen", which contain the respective common setup and teardown code.

These methods will, certainly, not be called implicitly before each test method, but instead you would call them explicitly. This leaves a bit of code duplication, but brings the benefit that it becomes clear from the test method itself which setup activities actually take place. Your own helper methods can certainly take parameters, for example "ensureTrafficLightIs Green ". Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 7 years, 3 months ago. Active 1 year, 3 months ago. Viewed 41k times. Improve this question. For example, if initializeCityDatabase returned a promise that resolved when the database was initialized, we would want to return that promise:.

In some cases, you only need to do setup once, at the beginning of a file. This can be especially bothersome when the setup is asynchronous, so you can't do it inline. Jest provides beforeAll and afterAll to handle this situation. For example, if both initializeCityDatabase and clearCityDatabase returned promises, and the city database could be reused between tests, we could change our test code to:. By default, the beforeAll and afterAll blocks apply to every test in a file.

To perform this test, we might need Jane to have an account, and have already logged on to the application. We could use the Background step for this, as illustrated here:. Background steps are implemented just like any other Cucumber step. Using the Action Classes pattern, the step definitions might look something like this:.

Background steps are run before each scenario, including each example, so sometimes the test code might need to check whether a particular setup action has already been completed.

For example, the opensAnAccountFor method might be able to check whether an account for Jane already exists, and if it does simply clear any relevant data for this account. Naturally this kind of logic will depend on the nature of your application. The steps in a background section also appear in the test reports, which can be useful if the steps are relevant to understanding the scenario from a business perspective, but less so if they are simply about setting up test date.

Setup and teardown play a crucial role in the testing world. We have seen how to use setup and teardown in our test cases and also how they are executed. Musab Zayadneh.

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