chore: Use environment variable in python tests for getting current year.

Author: blakeli0

hermetic_build/library_generation/owlbot/synthtool/languages/java.py

@@ -30,7 +30,7 @@
 
 JAR_DOWNLOAD_URL = "https://github.com/google/google-java-format/releases/download/google-java-format-{version}/google-java-format-{version}-all-deps.jar"
 DEFAULT_FORMAT_VERSION = "1.7"
-CURRENT_YEAR = date.today().year
+CURRENT_YEAR = int(os.getenv("TEST_CURRENT_YEAR", date.now().year))
 GOOD_LICENSE = f"""/*
  * Copyright {CURRENT_YEAR} Google LLC
  *

hermetic_build/library_generation/tests/owlbot/java_unit_tests.py

@@ -173,7 +173,7 @@ def test_deprecate_method(self):
             )
             os.chdir(cwd)
 
-    @mock.patch.object(java, "CURRENT_YEAR", 2025)
+    @mock.patch.dict(os.environ, {"TEST_CURRENT_YEAR": TEST_CURRENT_YEAR})
     def test_fix_proto_license(self):
         with tempfile.TemporaryDirectory() as tempdir:
             cwd = os.getcwd()
@@ -190,7 +190,7 @@ def test_fix_proto_license(self):
             )
             os.chdir(cwd)
 
-    @mock.patch.object(java, "CURRENT_YEAR", 2025)
+    @mock.patch.dict(os.environ, {"TEST_CURRENT_YEAR": TEST_CURRENT_YEAR})
     def test_fix_proto_license_idempotent(self):
         with tempfile.TemporaryDirectory() as tempdir:
             cwd = os.getcwd()
@@ -209,7 +209,7 @@ def test_fix_proto_license_idempotent(self):
             )
             os.chdir(cwd)
 
-    @mock.patch.object(java, "CURRENT_YEAR", 2025)
+    @mock.patch.dict(os.environ, {"TEST_CURRENT_YEAR": TEST_CURRENT_YEAR})
     def test_fix_grpc_license(self):
         with tempfile.TemporaryDirectory() as tempdir:
             cwd = os.getcwd()
@@ -226,7 +226,7 @@ def test_fix_grpc_license(self):
             )
             os.chdir(cwd)
 
-    @mock.patch.object(java, "CURRENT_YEAR", 2025)
+    @mock.patch.dict(os.environ, {"TEST_CURRENT_YEAR": TEST_CURRENT_YEAR})
     def test_fix_grpc_license_idempotent(self):
         with tempfile.TemporaryDirectory() as tempdir:
             cwd = os.getcwd()

hermetic_build/library_generation/tests/resources/goldens/owlbot-golden.py

@@ -33,4 +33,4 @@
     "license-checks.xml",
     "renovate.json",
     ".gitignore"
-])
+])