refactor tests (#285)

* add basic ruff linting/formatting

* make tests use common fixtures

* clean up tests

* ignore preprocessing from coverage

.codecov.yml

@@ -3,4 +3,5 @@
 ignore:
   - "setup.py"
   - "aisdc/safemodel/classifiers/new_model_template.py"
+  - "aisdc/preprocessing"
 ...

pyproject.toml

@@ -38,7 +38,7 @@ target-version = "py39"
 
 lint.select = [
 #  "ANN", # flake8-annotations
-#  "ARG", # flake8-unused-arguments
+  "ARG", # flake8-unused-arguments
 #  "B",   # flake8-bugbear
 #  "C4",  # flake8-comprehensions
 #  "C90", # mccabe
@@ -48,26 +48,29 @@ lint.select = [
 #  "EM",  # flake8-errmsg
 #  "ERA", # eradicate
 #  "F",   # Pyflakes
-#  "I",   # isort
-#  "ICN", # flake8-import-conventions
+  "I",   # isort
+  "ICN", # flake8-import-conventions
 #  "N",   # pep8-naming
 #  "PD",  # pandas-vet
-#  "PGH", # pygrep-hooks
+  "PGH", # pygrep-hooks
 #  "PIE", # flake8-pie
 #  "PL",  # Pylint
-#  "PLC", # Pylint
-#  "PLE", # Pylint
+  "PLC", # Pylint
+  "PLE", # Pylint
 #  "PLR", # Pylint
 #  "PLW", # Pylint
-#  "PT",  # flake8-pytest-style
-#  "Q",   # flake8-quotes
+  "PT",  # flake8-pytest-style
+  "Q",   # flake8-quotes
 #  "RET", # flake8-return
-#  "RUF100",  # Ruff-specific
+  "RUF100",  # Ruff-specific
 #  "S",   # flake8-bandit
 #  "SIM", # flake8-simplify
 #  "T20", # flake8-print
 #  "TID", # flake8-tidy-imports
 #  "UP",  # pyupgrade
-#  "W",   # pycodestyle
-#  "YTT",  # flake8-2020
+  "W",   # pycodestyle
+  "YTT",  # flake8-2020
 ]
+
+[tool.ruff.per-file-ignores]
+"tests/**/*" = ["S101"]