Modernize testing/linting configuration (#65)

This simplifies and modernizes the configuration for various testing and
linting tools. Use pyproject.toml as the central location for all
configuration as much as possible.

Details:

- Move pytest config to pyproject.toml (modern location)
- Move mypy config to pyproject.toml (modern location)
- Move unit test files into already existing tests/ dir;
  use importable and recognized-by-default-by-pytest names.
- Remove seemingly unnecessary coveragerc file; it seemed mostly
  old and outdated copy/paste of boilerplate.
- Move tool config out of CI config files as much as possible (coverage
  report filenames etc) which is not only cleaner but also better for
  local development because it will use the same settings.
- make yamllint happy about all yaml/yml files

.github/workflows/ci.yml

@@ -1,3 +1,4 @@
+---
 on:
   push:
     branches:
@@ -45,12 +46,12 @@ jobs:
 
       # Tests
       - name: Run tests
-        run: pytest --cov-report term --cov-report xml:coverage.xml --ignore-glob=result/tests-pattern-matching.py
+        run: pytest --ignore=tests/test_pattern_matching.py
       - name: Run tests (pattern matching)
-        run: pytest --cov-report term --cov-report xml:coverage.xml result/tests-pattern-matching.py
         if: matrix.python == '3.10'
+        run: pytest tests/test_pattern_matching.py
       - name: Run mypy
-        run: mypy result/result.py result/tests.py
+        run: mypy
 
       # Packaging
       - name: Build packages
@@ -61,6 +62,6 @@ jobs:
       # Coverage
       - name: Upload coverage to codecov.io
         uses: codecov/codecov-action@v1
-        if: matrix.python == '3.8'
+        if: matrix.python == '3.9'
         with:
           token: ${{ secrets.CODECOV_TOKEN }}

codecov.yml

@@ -1,3 +1,4 @@
+---
 coverage:
   precision: 2
   round: nearest
@@ -10,4 +11,4 @@ coverage:
 comment:
   layout: "diff, flags, files"
   behavior: default
-  require_changes: yes
+  require_changes: true

pyproject.toml

@@ -1,3 +1,38 @@
 [build-system]
 requires = ["setuptools", "wheel"]
 build-backend = "setuptools.build_meta"
+
+[tool.mypy]
+python_version = "3.10"
+files = [
+  "result",
+  "tests",
+]
+# Exclude files with pattern matching syntax until Mypy supports it;
+# see https://github.com/python/mypy/issues/10201
+exclude = "tests/test_pattern_matching.py"
+disallow_untyped_calls = true
+disallow_untyped_defs = true
+ignore_missing_imports = true
+no_implicit_optional = true
+show_column_numbers = true
+show_error_codes = true
+show_error_context = true
+show_none_errors = true
+strict_optional = true
+warn_redundant_casts = true
+warn_return_any = true
+warn_unused_ignores = true
+
+[tool.pytest.ini_options]
+addopts = [
+  "--flake8",
+  "--tb=short",
+  "--cov=.",
+  "--cov-report=term",
+  "--cov-report=xml",
+]
+testpaths = [
+  "result",
+  "tests",
+]

setup.cfg

@@ -31,20 +31,11 @@ zip_safe = True
 [options.package_data]
 result = py.typed
 
-[tool:pytest]
-addopts = --flake8 --tb=short --cov=.
-python_files = tests.py
-norecursedirs = *.egg tmp* build .tox
-flake8-ignore =
-    *.py E126 E127 E128 W504
-    setup.py ALL
-    */tests/* ALL
-    */docs/* ALL
-    */build/* ALL
-    */venv/* ALL
-    */TOXENV/* ALL
-    result/tests-pattern-matching.py ALL  # Note: Looks like pytest-flake8 doesn't support 3.10 yet
-flake8-max-line-length = 99
-
 [flake8]
+# flake8 does not (yet?) support pyproject.toml; see
+# https://github.com/PyCQA/flake8/issues/234
 max-line-length = 99
+exclude =
+    .direnv/
+    .tox/
+    venv/

tests/type-checking/test_result.yml

@@ -1,3 +1,4 @@
+---
 # reveal_type(res3) # N: Revealed type is "result.result.Err[builtins.int]"
 - case: failure_lash
   disable_cache: false