I - What is Unit Test?
A unit test is a way of testing a unit - the smallest piece of code that can be logically isolated in a system.
A unit test characteristics -
1. Verifies a small piece of code (also known as a unit),
2. Does it quickly,
3. And does it in an isolated manner
II - Why to do Unit Test?
A project without tests has a head start but quickly slows down to the point that it’s hard to make any progress. This phenomenon of quickly decreasing development speed is also known as software entropy.
III - How to structure Unit Test?

Using the AAA pattern - split each test into three parts: arrange, act, and assert.

IV - Test Doubles (Dummy, Fake, Stub, Mock and Spies)

V - Example of Stub using sinon library

Master XPath for UI Automation Testing: [ Ссылка ]

JAVASCRIPT
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FRAMEWORK, ASSERTION, REPORT
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ELEMENT LOCATOR
jQuery -
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CSS SELECTOR
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XPath
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Nodejs Basics [ Ссылка ]

WEB & API CONCEPTS

Important API Testing Concepts - API TESTING 101
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Cypress Tutorial - : [ Ссылка ]

Learn API Testing using Postman: [ Ссылка ]

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