pyproject: define test path in pyproject.toml

This way it _just works_.

Author: indygreg

.github/workflows/test.yml

@@ -96,13 +96,13 @@ jobs:
 
       - name: Test C Backend
         run: |
-          uv -v run --locked pytest --numprocesses=auto --hypothesis-profile=${HYPOTHESIS_PROFILE} -v tests/
+          uv -v run --locked pytest --numprocesses=auto --hypothesis-profile=${HYPOTHESIS_PROFILE} -v
 
       - name: Test CFFI Backend
         env:
           PYTHON_ZSTANDARD_IMPORT_POLICY: 'cffi'
         run: |
-          uv -v run --locked -w cffi pytest --numprocesses=auto --hypothesis-profile=${HYPOTHESIS_PROFILE} -v tests/
+          uv -v run --locked -w cffi pytest --numprocesses=auto --hypothesis-profile=${HYPOTHESIS_PROFILE} -v
 
       - name: Test Rust Backend
         if: matrix.arch != 'x86'
@@ -113,4 +113,4 @@ jobs:
         run: |
           # We need --reinstall to get uv to pick up the config settings change.
           # Unsure if this is a bug.
-          uv -v run --locked --config-settings-package 'zstandard:--build-option=--rust-backend' --reinstall pytest --numprocesses=auto --hypothesis-profile=${HYPOTHESIS_PROFILE} -v tests/
+          uv -v run --locked --config-settings-package 'zstandard:--build-option=--rust-backend' --reinstall pytest --numprocesses=auto --hypothesis-profile=${HYPOTHESIS_PROFILE} -v

pyproject.toml

@@ -49,6 +49,9 @@ dev = [
     "pytest-xdist>=3.8.0",
 ]
 
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+
 [tool.ruff]
 line-length = 80