tests: run in parallel

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

Author: henryiii

noxfile.py

@@ -54,6 +54,7 @@ def tests(session: nox.Session) -> None:
         "--cov-config",
         "pyproject.toml",
         "--cov-report=",
+        "--numprocesses=auto",
         *session.posargs,
         env={
             "COVERAGE_FILE": coverage_file,
@@ -87,7 +88,7 @@ def conda_tests(session: nox.Session) -> None:
     # Currently, this doesn't work on Windows either with or without quoting
     if not sys.platform.startswith("win32"):
         session.conda_install("requests<99")
-    session.run("pytest", *session.posargs)
+    session.run("pytest", "--numprocesses=auto", *session.posargs)
 
 
 @nox.session(venv_backend="mamba", default=shutil.which("mamba"))
@@ -99,7 +100,7 @@ def mamba_tests(session: nox.Session) -> None:
     session.install("-e.", "--no-deps")
     if not sys.platform.startswith("win32"):
         session.conda_install("requests<99")
-    session.run("pytest", *session.posargs)
+    session.run("pytest", "--numprocesses=auto", *session.posargs)
 
 
 @nox.session(venv_backend="micromamba", default=shutil.which("micromamba"))
@@ -112,7 +113,7 @@ def micromamba_tests(session: nox.Session) -> None:
     session.install("-e.", "--no-deps")
     if not sys.platform.startswith("win32"):
         session.conda_install("requests<99")
-    session.run("pytest", *session.posargs)
+    session.run("pytest", "--numprocesses=auto", *session.posargs)
 
 
 @nox.session(default=False)

pyproject.toml

@@ -73,6 +73,7 @@ test = [
   "pytest>=7.4; python_version>='3.12'",
   "pytest>=7; python_version<'3.12'",
   "pytest-cov>=3",
+  "pytest-xdist>=3",
 ]
 docs = [
   "myst-parser",

requirements-conda-test.txt

@@ -4,5 +4,6 @@ colorlog >=2.6.1,<7.0.0
 dependency-groups >=1.1
 jinja2
 pytest
+pytest-xdist
 tox>=4.0.0
 virtualenv >=20.14.1

tests/test_sessions.py

@@ -41,7 +41,9 @@
 from nox.logger import logger
 
 HAS_CONDA = shutil.which("conda") is not None
-has_conda = pytest.mark.skipif(not HAS_CONDA, reason="Missing conda command.")
+has_conda = pytest.mark.skipif(not HAS_CONDA, reason="Missing conda command.")(
+    pytest.mark.xdist_group(name="conda")
+)
 
 DIR = Path(__file__).parent.resolve()
 

tests/test_virtualenv.py

@@ -45,7 +45,9 @@
 VIRTUALENV_VERSION = metadata.version("virtualenv")
 
 has_uv = pytest.mark.skipif(not HAS_UV, reason="Missing uv command.")
-has_conda = pytest.mark.skipif(not HAS_CONDA, reason="Missing conda command.")
+has_conda = pytest.mark.skipif(not HAS_CONDA, reason="Missing conda command.")(
+    pytest.mark.xdist_group(name="conda")
+)
 
 
 class TextProcessResult(NamedTuple):