Improve testing - developer experience

[soapy1]

Context

Currently the test coverage on conda-store is minimal. This makes it difficult to identify when changes might have unintended consequences (like breaking some functionality in another part of the application). For example, it would be nice if issues like #615 could be caught by automated tests.

It would be nice to:

• have more test coverage in conda-store
• remove tests that are not helpful (if possible)
• have the ability to see code coverage information for each pr (eg. integration with code cov, or a github action)
• be able to run unit tests locally (eg. the unit tests are fast)

Value and/or benefit

This will give developers more confidence that their proposed changes will not have unintended consequences in other parts of the software.

Anything else?

Currently the code coverage is:

Name                                                                                                    Stmts   Miss  Cover
---------------------------------------------------------------------------------------------------------------------------
conda_store_server/__init__.py                                                                             71     30    58%
conda_store_server/_internal/__init__.py                                                                    0      0   100%
conda_store_server/_internal/action/__init__.py                                                            14      0   100%
conda_store_server/_internal/action/add_conda_prefix_packages.py                                           30      1    97%
conda_store_server/_internal/action/add_lockfile_packages.py                                               22      1    95%
conda_store_server/_internal/action/base.py                                                                54      3    94%
conda_store_server/_internal/action/download_packages.py                                                   55      0   100%
conda_store_server/_internal/action/generate_conda_docker.py                                                5      1    80%
conda_store_server/_internal/action/generate_conda_export.py                                               10      1    90%
conda_store_server/_internal/action/generate_conda_pack.py                                                  6      0   100%
conda_store_server/_internal/action/generate_constructor_installer.py                                      64      4    94%
conda_store_server/_internal/action/generate_lockfile.py                                                   36      6    83%
conda_store_server/_internal/action/get_conda_prefix_stats.py                                               9      1    89%
conda_store_server/_internal/action/install_lockfile.py                                                    12      0   100%
conda_store_server/_internal/action/install_specification.py                                               10      0   100%
conda_store_server/_internal/action/remove_conda_prefix.py                                                  9      0   100%
conda_store_server/_internal/action/set_conda_prefix_permissions.py                                        19      4    79%
conda_store_server/_internal/action/utils.py                                                                2      0   100%
conda_store_server/_internal/alembic/env.py                                                                25      5    80%
conda_store_server/_internal/alembic/versions/0f7e23ff24ee_add_worker.py                                   10      1    90%
conda_store_server/_internal/alembic/versions/03c839888c82_add_canceled_status.py                          13      2    85%
conda_store_server/_internal/alembic/versions/5ad723de2abd_adding_container_registry_value_to_enum.py      16      3    81%
conda_store_server/_internal/alembic/versions/8d63a091aff8_add_environment_description.py                  12      2    83%
conda_store_server/_internal/alembic/versions/16f65805dc8f_split_conda_package_into_conda_package_.py      70     26    63%
conda_store_server/_internal/alembic/versions/30b37e725c32_add_build_key_version.py                        10      1    90%
conda_store_server/_internal/alembic/versions/48be4072fe58_initial_schema.py                               44     11    75%
conda_store_server/_internal/alembic/versions/57cd11b949d5_add_installer.py                                15      4    73%
conda_store_server/_internal/alembic/versions/771180018e1b_add_v2_role_mappings.py                         10      1    90%
conda_store_server/_internal/alembic/versions/abd7248d5327_adding_a_settings_table.py                      12      1    92%
conda_store_server/_internal/alembic/versions/b387747ca9b7_role_mapping.py                                 12      2    83%
conda_store_server/_internal/alembic/versions/bf065abf375b_lockfile_spec.py                                10      1    90%
conda_store_server/_internal/alembic/versions/d78e9889566a_add_status_info.py                              10      1    90%
conda_store_server/_internal/alembic/versions/e17b4cc6e086_add_build_hash.py                               10      1    90%
conda_store_server/_internal/build.py                                                                     175     60    66%
conda_store_server/_internal/client.py                                                                      7      7     0%
conda_store_server/_internal/conda_utils.py                                                                78     45    42%
conda_store_server/_internal/dbutil.py                                                                     31      1    97%
conda_store_server/_internal/environment.py                                                                87     19    78%
conda_store_server/_internal/orm.py                                                                       361    107    70%
conda_store_server/_internal/schema.py                                                                    367     29    92%
conda_store_server/_internal/server/__init__.py                                                             0      0   100%
conda_store_server/_internal/server/__main__.py                                                             4      4     0%
conda_store_server/_internal/server/app.py                                                                160     42    74%
conda_store_server/_internal/server/views/__init__.py                                                       5      0   100%
conda_store_server/_internal/server/views/api.py                                                          454    159    65%
conda_store_server/_internal/server/views/conda_store_ui.py                                                 7      0   100%
conda_store_server/_internal/server/views/metrics.py                                                       23      0   100%
conda_store_server/_internal/server/views/registry.py                                                      92     65    29%
conda_store_server/_internal/server/views/ui.py                                                           101     70    31%
conda_store_server/_internal/testing.py                                                                    39      0   100%
conda_store_server/_internal/utils.py                                                                     104     20    81%
conda_store_server/_internal/worker/__init__.py                                                             0      0   100%
conda_store_server/_internal/worker/__main__.py                                                             4      4     0%
conda_store_server/_internal/worker/app.py                                                                 34     12    65%
conda_store_server/_internal/worker/tasks.py                                                              192    101    47%
conda_store_server/_version.py                                                                             11     11     0%
conda_store_server/api.py                                                                                 333     79    76%
conda_store_server/app.py                                                                                 293     64    78%
conda_store_server/registry.py                                                                             85     63    26%
conda_store_server/server/__init__.py                                                                       0      0   100%
conda_store_server/server/auth.py                                                                         334     73    78%
conda_store_server/server/dependencies.py                                                                  11      0   100%
conda_store_server/storage.py                                                                             106     36    66%
---------------------------------------------------------------------------------------------------------------------------
TOTAL                                                                                                    4205   1185    72%

[soapy1]

With the pr's:

• Test improvements - part 1 #919
• Add coverage report to unit tests #923
• Move seeding tests functionality into test module #925
• Add tests - storage + worker #926
• Remove unused _internal/client module #928

we achieve most of the goals of this issue. Code coverage is at 75%

TOTAL                                         4168   1062    75%

I think there is still lots of room for improvements with the tests, but I think this is a good start. Will write new issues for other improvements that can be made.