Learnt from: KJhellico
PR: vacanza/holidays#2530
File: holidays/locale/ca/LC_MESSAGES/AD.po:31-40
Timestamp: 2025-05-06T15:25:44.333Z
Learning: In the Holidays project, msgid fields in localization files contain strings in the entity's default language (as defined by default_language attribute), not English source strings as in standard gettext implementations.

Learnt from: KJhellico
PR: vacanza/holidays#2259
File: holidays/locale/en_IN/LC_MESSAGES/IN.po:30-299
Timestamp: 2025-03-05T17:51:00.633Z
Learning: In the Holidays project, .po files for a country's default locale use empty msgstr fields as a standard convention.

Learnt from: KJhellico
PR: vacanza/holidays#2684
File: holidays/locale/it/LC_MESSAGES/SM.po:13-13
Timestamp: 2025-06-28T10:39:19.185Z
Learning: In the holidays project, .po file header comments use the format "# [Country] holidays." for default language files (without trailing hash) and "# [Country] holidays [locale] localization." for non-default language files (also without trailing hash).

Learnt from: PPsyrius
PR: vacanza/holidays#2676
File: holidays/locale/ar/LC_MESSAGES/EG.po:0-0
Timestamp: 2025-06-25T10:09:29.029Z
Learning: In the holidays library, msgstr fields can be left empty for source/default_language files when using Lingva, the localization tool used by the project.

Learnt from: KJhellico
PR: vacanza/holidays#2960
File: holidays/locale/ca/LC_MESSAGES/ES.po:148-151
Timestamp: 2025-09-26T13:58:49.363Z
Learning: In the holidays project, when translating holiday names in .po files, the msgstr should be a faithful translation of the original msgid (in the country's default language), not influenced by English commentary or common en_US names. For example, "Día de la Pascua Granada" (Spanish) correctly translates to "Dia de la Pasqua Granada" (Catalan), even though the English comment refers to it as "Whit Monday".

Learnt from: KJhellico
PR: vacanza/holidays#2651
File: holidays/locale/pap_BQ/LC_MESSAGES/BQ.po:70-72
Timestamp: 2025-06-25T14:08:09.323Z
Learning: The Papiamento translation "Di dos dia di Pasku" for "Tweede Kerstdag" (Boxing Day) in holidays/locale/pap_BQ/LC_MESSAGES/BQ.po comes from an authoritative source, despite the literal meaning potentially seeming to refer to Easter rather than Christmas.

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.

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: 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#2386
File: tests/countries/test_nepal.py:499-536
Timestamp: 2025-04-05T06:49:06.217Z
Learning: In the holidays project, test files follow a dual testing approach: individual methods test specific holidays across multiple years, while comprehensive year-specific tests (e.g., `test_2025`) verify all holidays for a specific year in a single assertion. Both approaches serve different testing purposes and complement each other.

Learnt from: PPsyrius
PR: vacanza/holidays#2881
File: tests/countries/test_algeria.py:28-30
Timestamp: 2025-09-18T03:19:23.722Z
Learning: In the vacanza/holidays project, tests now use self.start_year and self.end_year from the TestCase class instead of country-specific aliases (like DZ.start_year) for start_year and end_year references. This approach provides the test framework with better control over test year ranges rather than being tied to specific country start years.

Learnt from: PPsyrius
PR: vacanza/holidays#2750
File: tests/countries/test_germany.py:46-46
Timestamp: 2025-07-24T15:21:31.632Z
Learning: In the holidays project test files, the standard method name for testing the absence of holidays is `test_no_holidays`, not more descriptive names like `test_no_holidays_before_1990`. This is a consistent naming convention across country test files like France and Germany.

Learnt from: PPsyrius
PR: vacanza/holidays#2881
File: tests/countries/test_indonesia.py:221-223
Timestamp: 2025-09-28T05:42:12.777Z
Learning: In tests/countries/test_indonesia.py, the manual set inclusion checks using get_named and years_found for Lunar New Year (test_lunar_new_year) and Vesak Day (test_vesak_day) are intentional and should remain until both holidays get their own `{insert}_no_estimated` flags implemented, rather than using standard harness assertions like assertHolidayName/assertNoHolidayName.

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_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: PPsyrius
PR: vacanza/holidays#2881
File: tests/countries/test_brazil.py:28-30
Timestamp: 2025-09-10T14:35:54.603Z
Learning: In the holidays project, the test_no_holidays method should test ALL supported_categories (via categories=CountryClass.supported_categories) rather than just the default PUBLIC category, to ensure comprehensive validation that no holidays exist before start_year across any supported category including OPTIONAL and subdivision categories.

Learnt from: PPsyrius
PR: vacanza/holidays#2881
File: tests/countries/test_curacao.py:29-29
Timestamp: 2025-09-20T12:24:28.864Z
Learning: For Curacao in the holidays library, PUBLIC and HALF_DAY categories have different start years - PUBLIC holidays begin at the country's start_year while HALF_DAY holidays begin in 2010. When testing no_holidays methods, each category should be tested separately with appropriate pre-start years rather than using a unified supported_categories approach.

Learnt from: PPsyrius
PR: vacanza/holidays#2881
File: tests/countries/test_barbados.py:21-23
Timestamp: 2025-09-14T16:03:13.558Z
Learning: In tests/countries/test_barbados.py, using years_non_observed=range(2000, 2024) is intentional because all observed holiday examples fall within 2001-2023, making this range appropriate for limiting testing to years where observed holidays actually exist in the test data.

Learnt from: KJhellico
PR: vacanza/holidays#2651
File: holidays/locale/nl/LC_MESSAGES/BQ.po:29-95
Timestamp: 2025-06-25T20:55:00.642Z
Learning: In the holidays library, Dutch locale files (.po) with `X-Source-Language: nl` should have empty msgstr entries when the target language is also Dutch. The library uses fallback=True with gettext, which returns the original msgid when msgstr is empty. This is the correct pattern for native language files and does not cause blank holiday names.