Increase test coverage

[DavisRayM]

Requested Changes

Currently the test coverage across the codebase is at around 75% we should look into increasing the coverage to 95% minimum:

Name                           Stmts   Miss  Cover
--------------------------------------------------
app/__init__.py                    0      0   100%
app/common_tags.py                 5      0   100%
app/database.py                    7      0   100%
app/jobs/jobs.py                  13      6    54%
app/jobs/scheduler.py             27     12    56%
app/libs/s3/client.py             30     20    33%
app/libs/tableau/client.py        24     18    25%
app/main.py                       51     14    73%
app/models.py                    141      6    96%
app/routers/__init__.py            0      0   100%
app/routers/configuration.py      60     14    77%
app/routers/file.py              142     30    79%
app/routers/oauth.py              63      7    89%
app/routers/server.py             28      3    89%
app/schemas.py                   103      0   100%
app/settings.py                   33      0   100%
app/utils/__init__.py              0      0   100%
app/utils/auth_utils.py           71      9    87%
app/utils/hyper_utils.py          53     38    28%
app/utils/onadata_utils.py       126     74    41%
app/utils/utils.py                34     26    24%
--------------------------------------------------
TOTAL                           1011    277    73%

Suggested breakdown

• Increase coverage for /app/utils/utils.py
• Increase coverage for /app/utils/onadata_utils.py
• Increase coverage for /app/utils/hyper_utils.py
• Increase coverage for /app/utils/auth_utils.py
• Increase coverage for /app/libs/tableau/client.py & /app/libs/s3/client.py

[AlfiyaZi]

Can I take this task?

[DavisRayM]

@AlfiyaZi yes, feel free to pick this up