Add integration tests to the test suite

[rogebrd]

Checklist

General Contributing

• Have you read the Code of Conduct and signed the CLA?

Is This a Code Change?

• Non-code related change (markdown/git settings etc)
• SDK Code Change
• Example/Test Code Change

Validation

• Does tox pass?
• Do the tests pass?

[codecov]

Codecov Report

Merging #377 (8aa6809) into main (f17bc14) will increase coverage by 0.58%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #377      +/-   ##
==========================================
+ Coverage   63.63%   64.21%   +0.58%     
==========================================
  Files          30       30              
  Lines       50823    50823              
  Branches     3724     3724              
==========================================
+ Hits        32343    32638     +295     
+ Misses      18453    18028     -425     
- Partials       27      157     +130     

Flag	Coverage Δ
integration	64.13% <ø> (?)
unit	63.63% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
dropbox/team.py	66.75% <0.00%> (+0.54%)	⬆️
dropbox/auth.py	74.57% <0.00%> (+1.27%)	⬆️
dropbox/base_team.py	30.52% <0.00%> (+1.44%)	⬆️
dropbox/files.py	68.67% <0.00%> (+1.90%)	⬆️
dropbox/base.py	29.37% <0.00%> (+3.44%)	⬆️
dropbox/team_common.py	76.64% <0.00%> (+3.64%)	⬆️
dropbox/users.py	67.00% <0.00%> (+4.07%)	⬆️
dropbox/common.py	77.95% <0.00%> (+5.51%)	⬆️
dropbox/check.py	86.11% <0.00%> (+8.33%)	⬆️
dropbox/exceptions.py	77.55% <0.00%> (+16.32%)	⬆️
... and 2 more

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