chore: fix test dependencies (#482)

Author: daniel-sanche

packages/google-cloud-datastore/noxfile.py

@@ -40,7 +40,9 @@
     "pytest-cov",
     "pytest-asyncio",
 ]
-UNIT_TEST_EXTERNAL_DEPENDENCIES = []
+UNIT_TEST_EXTERNAL_DEPENDENCIES = [
+    "six",
+]
 UNIT_TEST_LOCAL_DEPENDENCIES = []
 UNIT_TEST_DEPENDENCIES = []
 UNIT_TEST_EXTRAS = []
@@ -52,7 +54,9 @@
     "pytest",
     "google-cloud-testutils",
 ]
-SYSTEM_TEST_EXTERNAL_DEPENDENCIES = []
+SYSTEM_TEST_EXTERNAL_DEPENDENCIES = [
+    "six",
+]
 SYSTEM_TEST_LOCAL_DEPENDENCIES = []
 SYSTEM_TEST_DEPENDENCIES = []
 SYSTEM_TEST_EXTRAS = []

packages/google-cloud-datastore/owlbot.py

@@ -99,6 +99,9 @@ def get_staging_dirs(
 templated_files = common.py_library(
     microgenerator=True,
     split_system_tests=True,
+    # six required by (but not installed by) google-cloud-core < v2.0.0
+    unit_test_external_dependencies=["six"],
+    system_test_external_dependencies=["six"],
     cov_level=100,
 )
 s.move(