Pin test requirements.

noxfile.py

@@ -22,14 +22,12 @@ def _session(fn):
 
 @session(python=["3.8", "3.9", "3.10", "3.11", "pypy3"])
 def tests(session):
-    dependencies = ["pytest", ROOT]
+    session.install("-r", ROOT / "test-requirements.txt")
     if session.posargs == ["coverage"]:
-        dependencies.append("coverage[toml]")
-        session.install(*dependencies)
+        session.install("coverage[toml]")
         session.run("coverage", "run", "-m", "pytest")
         session.run("coverage", "report")
     else:
-        session.install(*dependencies)
         session.run("pytest", *session.posargs, REFERENCING)
 
 

test-requirements.in

@@ -0,0 +1,2 @@
+file:.#egg=referencing
+pytest

test-requirements.txt

@@ -0,0 +1,22 @@
+#
+# This file is autogenerated by pip-compile with Python 3.11
+# by the following command:
+#
+#    pip-compile --resolver=backtracking test-requirements.in
+#
+attrs==22.2.0
+    # via
+    #   pytest
+    #   referencing
+iniconfig==2.0.0
+    # via pytest
+packaging==23.0
+    # via pytest
+pluggy==1.0.0
+    # via pytest
+pyrsistent==0.19.3
+    # via referencing
+pytest==7.2.1
+    # via -r test-requirements.in
+file:.#egg=referencing
+    # via -r test-requirements.in