fixing noxfile

Author: daniel-sanche

.kokoro/presubmit/common.cfg

@@ -7,7 +7,7 @@ action {
   }
 }
 
-# TODO: remove after deprecating 3.7 and 3.8
+# TODO: remove explicit session setting after deprecating 3.7 and 3.8
 env_vars: {
     key: "NOX_SESSION"
     value: "unit-3.9 unit-3.10 unit-3.11 unit-3.12 unit-3.13 unit-3.14 docs lint lint_setup_py blacken cover"

.kokoro/presubmit/presubmit.cfg

@@ -5,3 +5,9 @@ env_vars: {
     key: "RUN_SYSTEM_TESTS"
     value: "false"
 }
+
+# TODO: remove explicit session setting after deprecating 3.7 and 3.8
+env_vars: {
+    key: "NOX_SESSION"
+    value: "unit-3.9 unit-3.10 unit-3.11 unit-3.12 unit-3.13 unit-3.14 docs lint lint_setup_py blacken cover"
+}

noxfile.py

@@ -79,7 +79,12 @@
 
 # 'docfx' is excluded since it only needs to run in 'docs-presubmit'
 nox.options.sessions = [
-    "unit",
+    "unit-3.9",
+    "unit-3.10",
+    "unit-3.11",
+    "unit-3.12",
+    "unit-3.13",
+    "unit-3.14",
     "system_emulated",
     "system",
     "mypy",
@@ -258,7 +263,7 @@ def install_systemtest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-@nox.session(python="3.8")
+@nox.session(python=DEFAULT_PYTHON_VERSION)
 def system_emulated(session):
     import subprocess
     import signal