Basic tests to cover Fairdrive UI functionality

[IgorShadurin]

It's important to ensure that changes to Fairdrive don't break existing functionality. To maintain quality control, tests should be added to cover at least the following basic use cases:

• Login via FDS credentials
• Login via mocked MetaMask
• Copy address of the user from user menu
• Create a pod
• Upload a file
• Delete a file
• Create a directory
• Delete a directory
• Upload a file to a directory
• Delete a file from a directory

If possible, adding tests to cover the invite functionality would be beneficial, though it's not as high a priority as the above cases.