Learnt from: PPsyrius
PR: vacanza/holidays#2881
File: tests/countries/test_south_africa.py:22-22
Timestamp: 2025-09-14T04:41:10.139Z
Learning: South Africa's observed holiday system only started in 1995, so in tests/countries/test_south_africa.py, using years_non_observed=range(1995, 2050) is intentional to limit testing to years where observed holidays actually exist, improving both correctness and performance.

Learnt from: KJhellico
PR: vacanza/holidays#2530
File: tests/countries/test_andorra.py:23-28
Timestamp: 2025-05-06T21:07:11.577Z
Learning: In the holidays project, test methods for country holidays follow a standard form where year ranges are explicitly recreated in each test method rather than being stored as class variables, to maintain consistency across all country tests.

Learnt from: PPsyrius
PR: vacanza/holidays#2416
File: tests/countries/test_turkmenistan.py:52-64
Timestamp: 2025-04-05T04:47:27.213Z
Learning: For holiday tests in the vacanza/holidays project, structure tests by individual holidays rather than by years. Each test method should focus on a specific holiday and test it across multiple years (from start_year through 2050) using helper methods like `assertHolidayName`. For fixed holidays, use generators like `(f"{year}-01-01" for year in range(1991, 2051))`. For movable holidays, specify individual dates for specific years followed by a range check.

Learnt from: PPsyrius
PR: vacanza/holidays#2537
File: tests/countries/test_finland.py:23-26
Timestamp: 2025-05-09T18:36:09.607Z
Learning: The holidays project prioritizes complete historical coverage in tests, verifying holidays from their first year of observance (e.g., 1853 for Finland) through future projections, rather than using shorter sliding windows.

Learnt from: PPsyrius
PR: vacanza/holidays#2881
File: tests/countries/test_saint_helena_ascension_and_tristan_da_cunha.py:209-209
Timestamp: 2025-09-14T17:17:14.387Z
Learning: In tests/countries/test_saint_helena_ascension_and_tristan_da_cunha.py, the explicit loop iteration pattern for subdivision-specific holiday checks (like Anniversary Day for TA subdivision) is intentionally preferred over using assertSubdivTa helper methods, as confirmed by PPsyrius.

Learnt from: PPsyrius
PR: vacanza/holidays#2881
File: tests/countries/test_belgium.py:28-30
Timestamp: 2025-09-20T12:21:50.877Z
Learning: Belgium holidays implementation currently lacks a start_year attribute. In tests/countries/test_belgium.py, do not suggest adding test_no_holidays methods that rely on start_year until the start_year attribute is introduced to Belgium's holiday implementation.