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Add tests for NotEnoughFieldsError priority in Date::from_fields #7098

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Oct 15, 2025
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Add tests for NotEnoughFieldsError priority in Date::from_fields #7098

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Add tests for NotEnoughFieldsError priority in Date::from_fields
Manishearth Oct 14, 2025
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Manishearth Oct 14, 2025
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Manishearth Oct 14, 2025
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1 change: 1 addition & 0 deletions components/calendar/src/tests/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,3 +4,4 @@

mod continuity_test;
mod extrema;
mod not_enough_fields;
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Nit: crate/src/tests is a weird thing specifically in icu_calendar for tests that need to access pub(crate) items. Most tests should go into crate/tests.

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Yes, I made this choice because the test gets much more ugly because of non_exhaustive.

202 changes: 202 additions & 0 deletions components/calendar/src/tests/not_enough_fields.rs
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@@ -0,0 +1,202 @@
// This file is part of ICU4X. For terms of use, please see the file
// called LICENSE at the top level of the ICU4X source tree
// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).

use crate::options::{DateFromFieldsOptions, MissingFieldsStrategy, Overflow};
use crate::types::DateFields;
use crate::Date;
use crate::DateError;

#[test]
fn test_from_fields_not_enough_fields() {
// Pick a sufficiently complex calendar.
let calendar = crate::cal::Hebrew::new();

let big_i32 = Some(i32::MAX);
let big_u8 = Some(u8::MAX);
let small_u8 = Some(1);
let small_i32 = Some(5000);

// We want to ensure that most NotEnoughFields cases return NotEnoughFields
// even when we're providing out-of-range values, so that
// this produces TypeError in Temporal as opposed to RangeError.

for overflow in [Overflow::Reject, Overflow::Constrain] {
for missing_fields in [MissingFieldsStrategy::Reject, MissingFieldsStrategy::Ecma] {
let options = DateFromFieldsOptions {
overflow: Some(overflow),
missing_fields_strategy: Some(missing_fields),
};

// No month data always errors
assert_eq!(
Date::try_from_fields(
DateFields {
era: Some("hebrew"),
era_year: big_i32,
extended_year: None,
ordinal_month: None,
month_code: None,
day: small_u8,
},
options,
calendar
),
Err(DateError::NotEnoughFields),
"Test with {options:?}"
);
assert_eq!(
Date::try_from_fields(
DateFields {
era: Some("hebrew"),
era_year: small_i32,
extended_year: None,
ordinal_month: None,
month_code: None,
day: big_u8,
},
options,
calendar
),
Err(DateError::NotEnoughFields),
"Test with {options:?}"
);
assert_eq!(
Date::try_from_fields(
DateFields {
era: None,
era_year: None,
extended_year: big_i32,
ordinal_month: None,
month_code: None,
day: small_u8,
},
options,
calendar
),
Err(DateError::NotEnoughFields),
"Test with {options:?}"
);

// Insufficient era-year data always errors
assert_eq!(
Date::try_from_fields(
DateFields {
era: Some("hebrew"),
era_year: None,
extended_year: None,
ordinal_month: big_u8,
month_code: None,
day: small_u8,
},
options,
calendar
),
Err(DateError::NotEnoughFields),
"Test with {options:?}"
);
assert_eq!(
Date::try_from_fields(
DateFields {
era: Some("hebrew"),
era_year: None,
extended_year: None,
ordinal_month: small_u8,
month_code: None,
day: big_u8,
},
options,
calendar
),
Err(DateError::NotEnoughFields),
"Test with {options:?}"
);

if missing_fields != MissingFieldsStrategy::Ecma {
// No year info errors only when there is no missing fields strategy
assert_eq!(
Date::try_from_fields(
DateFields {
era: None,
era_year: None,
extended_year: None,
ordinal_month: small_u8,
month_code: None,
day: big_u8,
},
options,
calendar
),
Err(DateError::NotEnoughFields),
"Test with {options:?}"
);
assert_eq!(
Date::try_from_fields(
DateFields {
era: None,
era_year: None,
extended_year: None,
ordinal_month: big_u8,
month_code: None,
day: small_u8,
},
options,
calendar
),
Err(DateError::NotEnoughFields),
"Test with {options:?}"
);

// No day info errors only when there is no missing field strategy
assert_eq!(
Date::try_from_fields(
DateFields {
era: None,
era_year: None,
extended_year: big_i32,
ordinal_month: small_u8,
month_code: None,
day: None,
},
options,
calendar
),
Err(DateError::NotEnoughFields),
"Test with {options:?}"
);
assert_eq!(
Date::try_from_fields(
DateFields {
era: Some("hebrew"),
era_year: big_i32,
extended_year: None,
ordinal_month: small_u8,
month_code: None,
day: None,
},
options,
calendar
),
Err(DateError::NotEnoughFields),
"Test with {options:?}"
);
assert_eq!(
Date::try_from_fields(
DateFields {
era: Some("hebrew"),
era_year: small_i32,
extended_year: None,
ordinal_month: big_u8,
month_code: None,
day: None,
},
options,
calendar
),
Err(DateError::NotEnoughFields),
"Test with {options:?}"
);
}
}
}
}