tests: remove protobuf cpp from tests which is no longer used as of Protobuf 4.x

Author: parthea

.librarian/generator-input/client-post-processing/bigtable-integration.yaml

@@ -568,25 +568,16 @@ replacements:
       @nox.session(python=ALL_PYTHON)
       @nox.parametrize(
           "protobuf_implementation",
-          ["python", "upb", "cpp"],
+          ["python", "upb"],
       )
       def unit(session, protobuf_implementation):
           # Install all test dependencies, then install this package in-place.
-          py_version = tuple([int(v) for v in session.python.split(".")])
-          if protobuf_implementation == "cpp" and py_version >= (3, 11):
-              session.skip("cpp implementation is not supported in python 3.11+")
 
           constraints_path = str(
               CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
           )
           install_unittest_dependencies(session, "-c", constraints_path)
 
-          # TODO(https://github.com/googleapis/synthtool/issues/1976):
-          # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
-          # The 'cpp' implementation requires Protobuf<4.
-          if protobuf_implementation == "cpp":
-              session.install("protobuf<4")
-
           # Run py.test against the unit tests.
           session.run(
               "py.test",
@@ -818,15 +809,11 @@ replacements:
       @nox.session(python=DEFAULT_PYTHON_VERSION)
       @nox.parametrize(
           "protobuf_implementation",
-          ["python", "upb", "cpp"],
+          ["python", "upb"],
       )
       def prerelease_deps(session, protobuf_implementation):
           """Run all tests with prerelease versions of dependencies installed."""
 
-          py_version = tuple([int(v) for v in session.python.split(".")])
-          if protobuf_implementation == "cpp" and py_version >= (3, 11):
-              session.skip("cpp implementation is not supported in python 3.11+")
-
           # Install all dependencies
           session.install("-e", ".[all, tests, tracing]")
           unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES

packages/google-cloud-bigtable/noxfile.py

@@ -216,25 +216,16 @@ def install_unittest_dependencies(session, *constraints):
 @nox.session(python=ALL_PYTHON)
 @nox.parametrize(
     "protobuf_implementation",
-    ["python", "upb", "cpp"],
+    ["python", "upb"],
 )
 def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
-    py_version = tuple([int(v) for v in session.python.split(".")])
-    if protobuf_implementation == "cpp" and py_version >= (3, 11):
-        session.skip("cpp implementation is not supported in python 3.11+")
 
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
-    # TODO(https://github.com/googleapis/synthtool/issues/1976):
-    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
-    # The 'cpp' implementation requires Protobuf<4.
-    if protobuf_implementation == "cpp":
-        session.install("protobuf<4")
-
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -466,15 +457,11 @@ def docfx(session):
 @nox.session(python=DEFAULT_PYTHON_VERSION)
 @nox.parametrize(
     "protobuf_implementation",
-    ["python", "upb", "cpp"],
+    ["python", "upb"],
 )
 def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
-    py_version = tuple([int(v) for v in session.python.split(".")])
-    if protobuf_implementation == "cpp" and py_version >= (3, 11):
-        session.skip("cpp implementation is not supported in python 3.11+")
-
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES