fix(deps): require six>=1.4.0 (#194)

noxfile.py

@@ -14,10 +14,13 @@
 
 from __future__ import absolute_import
 import os
+import pathlib
 import shutil
 
 import nox
 
+CURRENT_DIRECTORY = pathlib.Path(__file__).parent.absolute()
+
 SYSTEM_TEST_ENV_VARS = ("GOOGLE_APPLICATION_CREDENTIALS",)
 BLACK_VERSION = "black==20.8b1"
 GOOGLE_AUTH = "google-auth >= 1.22.0, < 2.0dev"
@@ -32,9 +35,13 @@
 def unit(session):
     """Run the unit test suite."""
 
+    constraints_path = str(
+        CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
+    )
+
     # Install all test dependencies, then install this package in-place.
     session.install("mock", "pytest", "pytest-cov", "pytest-asyncio<=0.14.0", GOOGLE_AUTH)
-    session.install("-e", ".[requests,aiohttp]")
+    session.install("-e", ".[requests,aiohttp]", "-c", constraints_path)
 
     # Run py.test against the unit tests.
     # NOTE: We don't require 100% line coverage for unit test runs since
@@ -60,9 +67,13 @@ def unit(session):
 def unit_2(session):
     """Run the unit test suite."""
 
+    constraints_path = str(
+        CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
+    )
+
     # Install all test dependencies, then install this package in-place.
     session.install("mock", "pytest", "pytest-cov")
-    session.install("-e", ".[requests]")
+    session.install("-e", ".[requests]", "-c", constraints_path)    
 
     # Run py.test against the unit tests.
     # NOTE: We don't require 100% line coverage for unit test runs since
@@ -210,6 +221,10 @@ def blacken(session):
 def system(session):
     """Run the system test suite."""
 
+    constraints_path = str(
+        CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
+    )
+
     # Environment check: environment variables are set.
     missing = []
     for env_var in SYSTEM_TEST_ENV_VARS:
@@ -225,7 +240,7 @@ def system(session):
     # Install all test dependencies, then install this package into the
     # virtualenv's dist-packages.
     session.install("mock", "pytest", GOOGLE_AUTH, "google-cloud-testutils")
-    session.install("-e", ".[requests,aiohttp]")
+    session.install("-e", ".[requests,aiohttp]", "-c", constraints_path)
 
     # Run py.test against the async system tests.
     if session.python.startswith("3"):

setup.py

@@ -24,7 +24,7 @@
 
 
 REQUIREMENTS = [
-    'six',
+    'six>=1.4.0',
     'google-crc32c >= 1.0, < 2.0dev; python_version>="3.5"',
     'crcmod >= 1.7; python_version=="2.7"',
 

testing/constraints-3.6.txt

@@ -0,0 +1,12 @@
+# This constraints file is used to check that lower bounds
+# are correct in setup.py
+# List *all* library dependencies and extras in this file.
+# Pin the version to the lower bound.
+#
+# e.g., if setup.py has "foo >= 1.14.0, < 2.0.0dev",
+# Then this file should have foo==1.14.0
+six==1.4.0
+crcmod==1.7
+google-crc32c==1.0
+aiohttp==3.6.2
+requests==2.18.0