greg.tests: migrate to pytest test runner

See merge request !11

Duplicated code is not a problem in itself.

Fixes: GREG-14

It becomes quite hard not to do this in Django, because a lot of
the imports share similar names to local symbol names.

Fixes: GREG-14

Fixes: GREG-14

Fixes: GREG-14

Fixes: GREG-14

This is a first stab at converting the tests for the Person model
to pytest.  It is more than likely that we will want to create
shared fixtures for these in the future.

Fixes: GREG-14

Creates a new module namespace greg.tests.api that for now contains
a single test, test_person.

Fixes: GREG-14

Literal translation of greg/tests/test_api_person.py into pytest
style.  This could certainly be improved.

Fixes: GREG-14

The faker module spams the logs from test runs with needless messages
such as these:

	INFO:faker.factory:Provider `faker.providers.address` has been localized to `en_US`.
	INFO:faker.factory:Provider `faker.providers.automotive` has been localized to `en_US`.
	WARNING:faker.factory:Specified locale `en_US` is not available for provider `faker.providers.bank`. Locale reset to `en_GB` for this provider.

By lowering the test logging verbosity of this module in pytest's conftests.py,
we silence these.

Fixes: GREG-14

The Django configuration expects a static directory to be present
on the file system, otherwise the tests will output a warning.  This
adds an empty directory using the clever git trick of ignoring
everything within the directory except the .gitignore file itself.

This silences a warning during the test run.

Fixes: GREG-14

django.conf.urls.url has been deprecated in favour of django.urls.re_path,
which has matching behaviour.

This silences two warnings during the test run.

Fixes: GREG-14

ugettext_lazy has been deprecated in favour of gettext_lazy.
This silences a deprecation warning outputted during test runs.

Fixes: GREG-14

Automatic commit from "poetry add --dev pytest-django" based on 5d52c80d.

Fixes: GREG-14

Pytest understands unittest-styled tests, so there is no immediate
need to update the test files themselves to a pytest idiomatic
syntax.

Fixes: GREG-14

Removing constraint on PersonRole

See merge request !7

build: introduce pylint, pyproject.toml, and formatting lints

See merge request !8

PersonTestData.setUp() calls super().setUp(), but this is only
available on GregAPITestCase.  This only works at runtime because
PersonTestData and GregAPITestCase is composed together with
multi-inheritance as part of PersonAPITestCase.

This change is obviously not ideal, but we will change it soon when
introducing pytest anyway.  This is just to get the lints passing.

Fixes: GREG-16

As reported by pylint.

Fixes: GREG-16

As reported by pylint.

Fixes: GREG-16

All reported by pylint.

Fixes: GREG-16

Fixes: GREG-16

Fixes: GREG-16

Some of the lint checks disabled in this patch should possibly be
re-enabled, but this is what is necessary to get the lints passing
on the current state of the source code without too much trouble.

Fixes: GREG-16

Pylint analyses the code for common bugs.

Fixes: GREG-16

We use black, the uncompromising Python code formatter.  This means
we have no need for autopep8.

Fixes: GREG-16

"make fmt" can now be invoked to auto-format Python code.

Fixes: GREG-16

Use black to check if the code is well-formatted and fail if it is not.

Fixes: GREG-16

Introduce a new lint task invoked through "make lint".  It currently
only lints the Poetry configuration.

The lint task is ran as part of the continuous integration pipeline.

Fixes: GREG-16

build: set default target to test

See merge request !6

A Makefile's default target is either the one defined by "all", or in
the absence of an "all" target, the first target found in the file.

This means the current default target is to clean the venv from disk.
This patch makes calling make non-destructive by redefining the default
target to run the tests.

We may want to change this in future to something more appropriate.

Fixes: GREG-13

build: set up a continuous integration pipeline for tests

See merge request !5

Fixes: GREG-15

Automatic commit from "poetry update" based on 63c09a3.

Fixes: GREG-15

Apparently pka-context-manager is mirrored on UiB's GitLab instance.
Picking it up from there makes a great deal of sense, otherwise the
CI test pipeline will fail because it does not have access to USIT's
Bitbucket instance.

Fixes: GREG-15