added test for alternate extensions logic

tests/modules/pii_scanner/test_pii_scanner_service.py

@@ -57,6 +57,15 @@ def pii_scanner_service(
     )
 
 
+@pytest.fixture()
+def pii_scanner_service_alternate_extensions(
+    mock_repo_files_repository: MagicMock, mock_echo: MagicMock
+) -> PiiScannerService:
+    return PiiScannerService(
+        mock_repo_files_repository, mock_echo, ignored_extensions=["go.mod", "go.sum"]
+    )
+
+
 def test_that_pii_scanner_service_finds_potential_pii(
     pii_scanner_service: PiiScannerService,
     mock_repo_files_repository: MagicMock,
@@ -130,3 +139,14 @@ def test_that_pii_scanner_prints_when_exceptions_encountered(
 
     mock_echo.print.assert_called_once()
     assert "Error PII scanning" in mock_echo.print.call_args.args[0]
+
+
+def test_that_pii_scanner_accepts_alternate_ignored_extensions(
+    pii_scanner_service_alternate_extensions: PiiScannerService,
+    mock_open_fn: MagicMock,
+    mock_echo: MagicMock,
+):
+    # Assert that both the custom extensions and the standard defaults
+    # are present in the initialized ignored extensions.
+    assert "go.mod" in pii_scanner_service_alternate_extensions.ignored_extensions
+    assert ".jpeg" in pii_scanner_service_alternate_extensions.ignored_extensions