ADD more test cases to improve test coverage

[PIG208]

Improving the test coverage will help us move more smoothly when doing code migrations and save some time from debugging. Specifically, we may want to test features that require external services like GitHub by mocking responses.

Setting up a workable GitHub organization with a bot user in the local development environment is troublesome and we can't use the token for automated tests. So coming up with a reasonable white-box testing infrastructure for these features can be crucial for maintaining the functionality API server. It will prevent us from bringing broken function calls or backward-incompatible changes to the codebase. I think this will also be helpful for #281.

----------- coverage: platform linux, python 3.9.5-final-0 -----------
Name                                                                Stmts   Miss  Cover
---------------------------------------------------------------------------------------
/home/pig208/Anubis/api/anubis/__init__.py                              0      0   100%
/home/pig208/Anubis/api/anubis/app.py                                  33     10    70%
/home/pig208/Anubis/api/anubis/config.py                               32      4    88%
/home/pig208/Anubis/api/anubis/k8s/__init__.py                          0      0   100%
/home/pig208/Anubis/api/anubis/k8s/pipeline.py                         29     20    31%
/home/pig208/Anubis/api/anubis/k8s/theia.py                           189    167    12%
/home/pig208/Anubis/api/anubis/lms/__init__.py                          0      0   100%
/home/pig208/Anubis/api/anubis/lms/assignments.py                     112     85    24%
/home/pig208/Anubis/api/anubis/lms/autograde.py                        48     34    29%
/home/pig208/Anubis/api/anubis/lms/courses.py                         161    122    24%
/home/pig208/Anubis/api/anubis/lms/lectures.py                         13      6    54%
/home/pig208/Anubis/api/anubis/lms/questions.py                       137    115    16%
/home/pig208/Anubis/api/anubis/lms/repos.py                             8      2    75%
/home/pig208/Anubis/api/anubis/lms/students.py                         17      9    47%
/home/pig208/Anubis/api/anubis/lms/submissions.py                     128    110    14%
/home/pig208/Anubis/api/anubis/lms/theia.py                            38     18    53%
/home/pig208/Anubis/api/anubis/lms/webhook.py                          35     29    17%
/home/pig208/Anubis/api/anubis/models/__init__.py                     355     59    83%
/home/pig208/Anubis/api/anubis/rpc/__init__.py                          0      0   100%
/home/pig208/Anubis/api/anubis/rpc/batch.py                             7      3    57%
/home/pig208/Anubis/api/anubis/rpc/lms.py                              17     12    29%
/home/pig208/Anubis/api/anubis/rpc/pipeline.py                         31     23    26%
/home/pig208/Anubis/api/anubis/rpc/seed.py                             53     47    11%
/home/pig208/Anubis/api/anubis/rpc/theia.py                            62     48    23%
/home/pig208/Anubis/api/anubis/rpc/visualizations.py                   18      8    56%
/home/pig208/Anubis/api/anubis/utils/__init__.py                        0      0   100%
/home/pig208/Anubis/api/anubis/utils/auth/__init__.py                   0      0   100%
/home/pig208/Anubis/api/anubis/utils/auth/http.py                      49     26    47%
/home/pig208/Anubis/api/anubis/utils/auth/oauth.py                      5      0   100%
/home/pig208/Anubis/api/anubis/utils/auth/token.py                     17      9    47%
/home/pig208/Anubis/api/anubis/utils/auth/user.py                      34     22    35%
/home/pig208/Anubis/api/anubis/utils/cache.py                           5      1    80%
/home/pig208/Anubis/api/anubis/utils/config.py                         19     12    37%
/home/pig208/Anubis/api/anubis/utils/data.py                          118     83    30%
/home/pig208/Anubis/api/anubis/utils/exceptions.py                     27     11    59%
/home/pig208/Anubis/api/anubis/utils/github/__init__.py                 0      0   100%
/home/pig208/Anubis/api/anubis/utils/github/api.py                     49     41    16%
/home/pig208/Anubis/api/anubis/utils/github/fix.py                     75     75     0%
/home/pig208/Anubis/api/anubis/utils/github/parse.py                   12      8    33%
/home/pig208/Anubis/api/anubis/utils/github/repos.py                   92     79    14%
/home/pig208/Anubis/api/anubis/utils/http/__init__.py                  44     29    34%
/home/pig208/Anubis/api/anubis/utils/http/decorators.py                71     47    34%
/home/pig208/Anubis/api/anubis/utils/http/files.py                     32     24    25%
/home/pig208/Anubis/api/anubis/utils/logging.py                         7      0   100%
/home/pig208/Anubis/api/anubis/utils/migrate.py                         6      2    67%
/home/pig208/Anubis/api/anubis/utils/pipeline/__init__.py               0      0   100%
/home/pig208/Anubis/api/anubis/utils/pipeline/decorators.py            22     22     0%
/home/pig208/Anubis/api/anubis/utils/rpc.py                            39     22    44%
/home/pig208/Anubis/api/anubis/utils/testing/__init__.py                0      0   100%
/home/pig208/Anubis/api/anubis/utils/testing/autograde_timings.py      54     54     0%
/home/pig208/Anubis/api/anubis/utils/testing/seed.py                   90     68    24%
/home/pig208/Anubis/api/anubis/utils/visuals/__init__.py                0      0   100%
/home/pig208/Anubis/api/anubis/utils/visuals/assignments.py            84     68    19%
/home/pig208/Anubis/api/anubis/utils/visuals/queries.py                 4      0   100%
/home/pig208/Anubis/api/anubis/utils/visuals/usage.py                  61     47    23%
/home/pig208/Anubis/api/anubis/views/__init__.py                        0      0   100%
/home/pig208/Anubis/api/anubis/views/admin/__init__.py                 19      0   100%
/home/pig208/Anubis/api/anubis/views/admin/assignments.py             110     54    51%
/home/pig208/Anubis/api/anubis/views/admin/auth.py                     19      8    58%
/home/pig208/Anubis/api/anubis/views/admin/autograde.py                70     38    46%
/home/pig208/Anubis/api/anubis/views/admin/config.py                   29     15    48%
/home/pig208/Anubis/api/anubis/views/admin/courses.py                 138     78    43%
/home/pig208/Anubis/api/anubis/views/admin/dangling.py                 28      9    68%
/home/pig208/Anubis/api/anubis/views/admin/ide.py                      80     40    50%
/home/pig208/Anubis/api/anubis/views/admin/late_exceptions.py          58     35    40%
/home/pig208/Anubis/api/anubis/views/admin/lectures.py                 74     46    38%
/home/pig208/Anubis/api/anubis/views/admin/questions.py               108     61    44%
/home/pig208/Anubis/api/anubis/views/admin/regrade.py                  82     48    41%
/home/pig208/Anubis/api/anubis/views/admin/seed.py                     15      3    80%
/home/pig208/Anubis/api/anubis/views/admin/static.py                   33     11    67%
/home/pig208/Anubis/api/anubis/views/admin/students.py                 77     40    48%
/home/pig208/Anubis/api/anubis/views/admin/visuals.py                  35     14    60%
/home/pig208/Anubis/api/anubis/views/pipeline/__init__.py               5      5     0%
/home/pig208/Anubis/api/anubis/views/pipeline/pipeline.py              76     76     0%
/home/pig208/Anubis/api/anubis/views/public/__init__.py                19      0   100%
/home/pig208/Anubis/api/anubis/views/public/assignments.py             20      4    80%
/home/pig208/Anubis/api/anubis/views/public/auth.py                   110     70    36%
/home/pig208/Anubis/api/anubis/views/public/courses.py                 44     19    57%
/home/pig208/Anubis/api/anubis/views/public/ide.py                     91     53    42%
/home/pig208/Anubis/api/anubis/views/public/lectures.py                14      3    79%
/home/pig208/Anubis/api/anubis/views/public/memes.py                    7      2    71%
/home/pig208/Anubis/api/anubis/views/public/profile.py                 26     13    50%
/home/pig208/Anubis/api/anubis/views/public/questions.py               40     18    55%
/home/pig208/Anubis/api/anubis/views/public/repos.py                   60     29    52%
/home/pig208/Anubis/api/anubis/views/public/static.py                  18      7    61%
/home/pig208/Anubis/api/anubis/views/public/submissions.py             51     29    43%
/home/pig208/Anubis/api/anubis/views/public/visuals.py                 18      7    61%
/home/pig208/Anubis/api/anubis/views/public/webhook.py                 71     51    28%
---------------------------------------------------------------------------------------
TOTAL                                                                4184   2567    39%

(test coverage for api/anubis)

[wabscale]

Yeah I agree with you 100% on this one. @nysteo and I were talking about this exactly today. I believe we may have our graduate devops team take the lead on expanding the tests.