fix(deps): update minimum dependency versions to pick up bugfixes (#496)

Also, actually test those minimum versions using constraints file.

Closes #494

noxfile.py

@@ -18,6 +18,7 @@
 
 from __future__ import absolute_import
 import os
+import pathlib
 import shutil
 
 import nox
@@ -30,6 +31,8 @@
 SYSTEM_TEST_PYTHON_VERSIONS = ["2.7", "3.8"]
 UNIT_TEST_PYTHON_VERSIONS = ["2.7", "3.6", "3.7", "3.8", "3.9"]
 
+CURRENT_DIRECTORY = pathlib.Path(__file__).parent.absolute()
+
 
 @nox.session(python=DEFAULT_PYTHON_VERSION)
 def lint(session):
@@ -65,9 +68,12 @@ def lint_setup_py(session):
 
 
 def default(session):
+    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", ".")
+    session.install("mock", "pytest", "pytest-cov", "-c", constraints_path)
+    session.install("-e", ".", "-c", constraints_path)
 
     # Run py.test against the unit tests.
     session.run(
@@ -93,6 +99,9 @@ def unit(session):
 
 @nox.session(python=SYSTEM_TEST_PYTHON_VERSIONS)
 def system(session):
+    constraints_path = str(
+        CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
+    )
     """Run the system test suite."""
     system_test_path = os.path.join("tests", "system.py")
     system_test_folder_path = os.path.join("tests", "system")
@@ -121,15 +130,15 @@ def system(session):
     # 2021-05-06: defer installing 'google-cloud-*' to after this package,
     #             in order to work around Python 2.7 googolapis-common-protos
     #             issue.
-    session.install(
-        "mock", "pytest",
-    )
-    session.install("-e", ".")
+    session.install("mock", "pytest", "-c", constraints_path)
+    session.install("-e", ".", "-c", constraints_path)
     session.install(
         "google-cloud-testutils",
         "google-cloud-iam",
         "google-cloud-pubsub < 2.0.0",
         "google-cloud-kms < 2.0dev",
+        "-c",
+        constraints_path,
     )
 
     # Run py.test against the system tests.

setup.py

@@ -28,8 +28,8 @@
 # 'Development Status :: 5 - Production/Stable'
 release_status = "Development Status :: 5 - Production/Stable"
 dependencies = [
-    "google-auth >= 1.11.0, < 2.0dev",
-    "google-cloud-core >= 1.4.1, < 2.0dev",
+    "google-auth >= 1.24.0, < 2.0dev",
+    "google-cloud-core >= 1.6.0, < 2.0dev",
     "google-resumable-media >= 1.3.0, < 2.0dev",
     "requests >= 2.18.0, < 3.0.0dev",
     "googleapis-common-protos < 1.53.0; python_version<'3.0'",

testing/constraints-3.6.txt

@@ -5,7 +5,7 @@
 #
 # e.g., if setup.py has "foo >= 1.14.0, < 2.0.0dev",
 # Then this file should have foo==1.14.0
-google-auth==1.11.0
-google-cloud-core==1.4.1
-google-resumable-media==1.0.0
-requests==2.18.0
+google-auth==1.24.0
+google-cloud-core==1.6.0
+google-resumable-media==1.3.0
+requests==2.18.0