LibJS: Partially implement Intl.Locale.prototype.collations property

We do not yet parse collation data from the CLDR. This stubs out the
collations property, analogous to Intl.supportedValuesOf.

1 files changed, 29 insertions, 0 deletions

diff --git a/Userland/Libraries/LibJS/Tests/builtins/Intl/Locale/Locale.prototype.collations.js b/Userland/Libraries/LibJS/Tests/builtins/Intl/Locale/Locale.prototype.collations.js
new file mode 100644
index 0000000000..e7732c2a58
--- /dev/null
+++ b/Userland/Libraries/LibJS/Tests/builtins/Intl/Locale/Locale.prototype.collations.js
@@ -0,0 +1,29 @@
+describe("errors", () => {
+    test("called on non-Locale object", () => {
+        expect(() => {
+            Intl.Locale.prototype.collations;
+        }).toThrowWithMessage(TypeError, "Not an object of type Intl.Locale");
+    });
+});
+
+describe("normal behavior", () => {
+    test("basic functionality", () => {
+        expect(Array.isArray(new Intl.Locale("en").collations)).toBeTrue();
+        expect(new Intl.Locale("en").collations).toEqual(["default"]);
+
+        expect(Array.isArray(new Intl.Locale("ar").collations)).toBeTrue();
+        expect(new Intl.Locale("ar").collations).toEqual(["default"]);
+    });
+
+    test("extension keyword overrides default data", () => {
+        expect(new Intl.Locale("en-u-co-compat").collations).toEqual(["compat"]);
+        expect(new Intl.Locale("en", { collation: "compat" }).collations).toEqual(["compat"]);
+
+        expect(new Intl.Locale("ar-u-co-reformed").collations).toEqual(["reformed"]);
+        expect(new Intl.Locale("ar", { collation: "reformed" }).collations).toEqual(["reformed"]);
+
+        // Invalid collations also take precedence.
+        expect(new Intl.Locale("en-u-co-ladybird").collations).toEqual(["ladybird"]);
+        expect(new Intl.Locale("en", { collation: "ladybird" }).collations).toEqual(["ladybird"]);
+    });
+});