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Testing
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=======
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> Note: This section is under development.
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TODO:
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- https://github.com/yiisoft/yii2/blob/master/extensions/codeception/README.md
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Testing is an important part of software development. Whether we are aware of it or not, we conduct testing continuously.
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For example, when we write a class in PHP, we may debug it step by step or simply use echo or die statements to verify
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that implementation is correct. In case of web application we're entering some test data in forms to ensure the page
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interacts with us as expected. The testing process could be automated so that each time when we need to test something,
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we just need to call up the code that perform testing for us. This is known as automated testing, which is the main topic
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of testing chapters.
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The testing support provided by Yii includes:
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- [Unit testing](test-unit.md) - verifies that a single unit of code is working as expected.
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- [Functional testing](test-functional.md) - verifies scenarios from a user's perspective via browser emulation.
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- [Acceptance testing](test-acceptance.md) - verifies scenarios from a user's perspective in a browser.
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Yii provides ready to use test sets for all three testing types in both basic and advanced application templates.
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Test environment setup
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----------------------
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In order to run tests with Yii you need to install [Codeception](http://codeception.com/). A good way to install it is
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the following:
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```
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composer global require "codeception/codeception=2.0.*"
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composer global require "codeception/specify=*"
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composer global require "codeception/verify=*"
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```
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That's it. Now we're able to use `codecept` from command line.
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