I've added a new test suite for the example scripts located in the examples/advanced_operations/ directory. The primary goal of these tests is to ensure the scripts function correctly with API version v19 and to verify their interactions with the Google Ads API client.

Here's a summary of the key changes:

1.  **New Test Directory and Tests:**
    *   I created `examples/advanced_operations/tests/`.
    *   I added 15 new test files, covering the following example scripts:
        *   `add_ad_customizer.py`
        *   `add_ad_group_bid_modifier.py`
        *   `add_app_campaign.py`
        *   `add_bidding_data_exclusion.py`
        *   `add_bidding_seasonality_adjustment.py`
        *   `add_call_ad.py`
        *   `add_demand_gen_campaign.py`
        *   `add_display_upload_ad.py`
        *   `add_dynamic_page_feed_asset.py`
        *   `add_dynamic_search_ads.py`
        *   `add_responsive_search_ad_full.py`
        *   `create_and_attach_shared_keyword_set.py`
        *   `find_and_remove_criteria_from_shared_set.py`
        *   `use_cross_account_bidding_strategy.py`
        *   `use_portfolio_bidding_strategy.py`
    *   The tests utilize Python's `unittest` and `unittest.mock`
        frameworks to mock API client interactions, service responses,
        and external calls.

2.  **Test Discovery Update:**
    *   I modified `noxfile.py` by changing the `unittest discover` start
        directory from `-s=tests` to `-s=.`. This allows Nox to
        discover and run the newly added tests in the
        `examples/advanced_operations/tests/` directory.

3.  **Coverage Notes:**
    *   Tests for `add_performance_max_campaign.py` were confirmed to be
        pre-existing and working.
    *   I attempted to create tests for `get_ad_group_bid_modifiers.py` and
        `add_smart_campaign.py`, but I'm currently
        blocked due to specific technical challenges with mocking
        (`proto_plus.message.Message.pb`) and internal errors,
        respectively. These are noted as pending.

This work significantly increases test coverage for the advanced operations
examples, providing greater confidence in their correctness and stability.

Author: google-labs-jules[bot]