Pin test requirements and replace flake8 with pylint

as the former had conflicting dependencies with other packages.
This pinning is needed as sometimes installing test dependencies
is super slow in CI/CD because pip has to resolve a matching set
of versions (I observed even a >20 minutes running time and a timeout).

.github/workflows/tests.yml

@@ -35,7 +35,7 @@ jobs:
       - name: Test
         run: |
           pytest --cov=. --cov-report=xml --strict-markers --mypy -v puppetboard test
-          flake8 -v .
+          pylint --errors-only puppetboard test
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v2
         with:

README.md

@@ -242,7 +242,7 @@ You're advised to do this inside a virtualenv specifically created to work on Pu
 You can run the tests with:
 ```bash
 pytest --cov=. --cov-report=xml --strict-markers --mypy puppetboard test
-flake8 -v .
+pylint --errors-only puppetboard test
 ```
 
 You can run the app it in development mode by simply executing:

pylintrc

@@ -0,0 +1,4 @@
+[tool.pylint."messages control"]
+
+disable = no-member
+

requirements-test.txt

@@ -1,18 +1,18 @@
 -r requirements.txt
-pep8
-coverage
-mock
-pytest>=7,<8
-flake8>=5.0.4,<6
-pytest-flake8>=1.1.1,<2
-pytest-cov
-pytest-mock
-pytest-mypy
-pytest-randomly
-cov-core
-beautifulsoup4
-bandit
-mypy
-types-requests
-types-setuptools
-types-toml
+pep8==1.7.1
+coverage==6.5.0
+mock==4.0.3
+pytest==7.2.0
+pylint==2.15.8
+pytest-pylint==0.19.0
+pytest-cov==4.0.0
+pytest-mock==3.10.0
+pytest-mypy==0.10.2
+pytest-randomly==3.12.0
+cov-core==1.15.0
+beautifulsoup4==4.11.1
+bandit==1.7.4
+mypy==0.991
+types-requests==2.28.11.5
+types-setuptools==65.6.0.2
+types-toml==0.10.8.1

setup.cfg

@@ -1,10 +1,6 @@
 [bdist_wheel]
 universal = 1
 
-[flake8]
-max-line-length=100
-exclude=venv,dist,build
-
 [mypy]
 ignore_missing_imports=True
 ignore_errors=False

test/test_core.py

@@ -5,7 +5,6 @@
 from puppetboard.core import get_friendly_error
 
 
-# flake8: noqa
 @pytest.mark.parametrize("raw_message,friendly_message", [
     ("Could not retrieve catalog from remote server: Error 500 on SERVER: Server Error: Evaluation "
      "Error: Error while evaluating a Resource Statement, Evaluation Error: Error while evaluating "
@@ -32,8 +31,8 @@
      Error while evaluating a Method call:
 
       Could not find class ::profiles::snapshot_restore
-    
-     …in …/qa/manifests/site.pp, line: 31, column: 7. 
+
+     …in …/qa/manifests/site.pp, line: 31, column: 7.
      """),
 ])
 def test_get_friendly_error(raw_message, friendly_message):