Parallelize Tests

Addresses #131

Amend: Fix dependencies

Author: LarsKue

requirements_dev.txt

@@ -1,5 +1,6 @@
 flake8>=6.1.0
 tox>=4.10.0
 pytest>=7.2.0
+pytest-xdist>=3.5.0
 pytest-cov>=4.1.0
 myp>=1.5.1

setup.cfg

@@ -51,6 +51,7 @@ testing =
     flake8 >= 3.9
     tox >= 3.24
     pytest >= 6.0
+    pytest-xdist >= 2.4.0
     pytest-cov >= 2.10.0
     mypy >= 0.910
 docs =

tox.ini

@@ -13,7 +13,7 @@ setenv =
 deps =
     -r{toxinidir}/requirements_dev.txt
 commands =
-    pytest --basetemp={envtmpdir}
+    pytest -n auto --basetemp={envtmpdir}
 
 [testenv:flake8]
 basepython = python3.10
@@ -23,7 +23,7 @@ commands = flake8 bayesflow tests
 [testenv:base]
 extras = test
 commands =
-    pytest tests
+    pytest tests -n auto
 
 [testenv:docs]
 extras =