Add test environment

[NadezhdaShosheva]

Summary

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A brief description of the pull request.
Screenshot in case of UI changes

Test plan

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List of steps to manually test introduced functionality:

• Log in
• Go to http://localhost:3000
• You should see everything works fine

Checklist

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• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added tests for new functionality
• My pull request is shorter than 500 lines

Screenshots

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Previous	Current
Previous screen	Current screen

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