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LibJS: Implement Intl.PluralRules.supportedLocalesOf

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Timothy Flynn 2022-01-28 13:31:04 -05:00 • committed by Linus Groh
parent 624fad3821
commit 8b3f49ff84
3 changed files with 65 additions and 0 deletions
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43
Userland/Libraries/LibJS/Tests/builtins/Intl/PluralRules/PluralRules.supportedLocalesOf.js Normal file
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describe("correct behavior", () => {
test("length is 1", () => {
expect(Intl.PluralRules.supportedLocalesOf).toHaveLength(1);
});
test("basic functionality", () => {
// prettier-ignore
const values = [
[[], []],
[undefined, []],
["en", ["en"]],
[new Intl.Locale("en"), ["en"]],
[["en"], ["en"]],
[["en", "en-gb", "en-us"], ["en", "en-GB", "en-US"]],
[["en", "de", "fr"], ["en", "de", "fr"]],
[["en-foobar"], ["en-foobar"]],
[["en-foobar-u-abc"], ["en-foobar-u-abc"]],
[["aa", "zz"], []],
[["en", "aa", "zz"], ["en"]],
];
for (const [input, expected] of values) {
expect(Intl.PluralRules.supportedLocalesOf(input)).toEqual(expected);
// "best fit" (implementation defined) just uses the same implementation as "lookup" at the moment
expect(
Intl.PluralRules.supportedLocalesOf(input, { localeMatcher: "best fit" })
).toEqual(Intl.PluralRules.supportedLocalesOf(input, { localeMatcher: "lookup" }));
}
});
});
describe("errors", () => {
test("invalid value for localeMatcher option", () => {
expect(() => {
Intl.PluralRules.supportedLocalesOf([], { localeMatcher: "foo" });
}).toThrowWithMessage(RangeError, "foo is not a valid value for option localeMatcher");
});
test("invalid language tag", () => {
expect(() => {
Intl.PluralRules.supportedLocalesOf(["aaaaaaaaa"]);
}).toThrowWithMessage(RangeError, "aaaaaaaaa is not a structurally valid language tag");
});
});