LibJS: Implement Intl.RelativeTimeFormat.prototype.resolvedOptions

Userland/Libraries/LibJS/Tests/builtins/Intl/RelativeTimeFormat/RelativeTimeFormat.prototype.resolvedOptions.js

@@ -0,0 +1,79 @@
+describe("correct behavior", () => {
+    test("length is 0", () => {
+        expect(Intl.RelativeTimeFormat.prototype.resolvedOptions).toHaveLength(0);
+    });
+
+    test("locale only contains relevant extension keys", () => {
+        const en1 = new Intl.RelativeTimeFormat("en-u-ca-islamicc");
+        expect(en1.resolvedOptions().locale).toBe("en");
+
+        const en2 = new Intl.RelativeTimeFormat("en-u-nu-latn");
+        expect(en2.resolvedOptions().locale).toBe("en-u-nu-latn");
+
+        const en3 = new Intl.RelativeTimeFormat("en-u-ca-islamicc-nu-latn");
+        expect(en3.resolvedOptions().locale).toBe("en-u-nu-latn");
+    });
+
+    test("numberingSystem may be set by option", () => {
+        const en = new Intl.RelativeTimeFormat("en", { numberingSystem: "latn" });
+        expect(en.resolvedOptions().numberingSystem).toBe("latn");
+
+        const el = new Intl.RelativeTimeFormat("el", { numberingSystem: "latn" });
+        expect(el.resolvedOptions().numberingSystem).toBe("latn");
+    });
+
+    test("numberingSystem may be set by locale extension", () => {
+        const en = new Intl.RelativeTimeFormat("en-u-nu-latn");
+        expect(en.resolvedOptions().numberingSystem).toBe("latn");
+
+        const el = new Intl.RelativeTimeFormat("el-u-nu-latn");
+        expect(el.resolvedOptions().numberingSystem).toBe("latn");
+    });
+
+    test("numberingSystem option overrides locale extension", () => {
+        const el = new Intl.RelativeTimeFormat("el-u-nu-latn", { numberingSystem: "grek" });
+        expect(el.resolvedOptions().numberingSystem).toBe("grek");
+    });
+
+    test("numberingSystem option limited to known 'nu' values", () => {
+        ["latn", "arab"].forEach(numberingSystem => {
+            const en = new Intl.RelativeTimeFormat("en", { numberingSystem: numberingSystem });
+            expect(en.resolvedOptions().numberingSystem).toBe("latn");
+        });
+
+        ["latn", "arab"].forEach(numberingSystem => {
+            const en = new Intl.RelativeTimeFormat(`en-u-nu-${numberingSystem}`);
+            expect(en.resolvedOptions().numberingSystem).toBe("latn");
+        });
+
+        ["latn", "grek"].forEach(numberingSystem => {
+            const el = new Intl.RelativeTimeFormat("el", { numberingSystem: numberingSystem });
+            expect(el.resolvedOptions().numberingSystem).toBe(numberingSystem);
+        });
+
+        ["latn", "grek"].forEach(numberingSystem => {
+            const el = new Intl.RelativeTimeFormat(`el-u-nu-${numberingSystem}`);
+            expect(el.resolvedOptions().numberingSystem).toBe(numberingSystem);
+        });
+    });
+
+    test("style", () => {
+        const en1 = new Intl.RelativeTimeFormat("en");
+        expect(en1.resolvedOptions().style).toBe("long");
+
+        ["long", "short", "narrow"].forEach(style => {
+            const en2 = new Intl.RelativeTimeFormat("en", { style: style });
+            expect(en2.resolvedOptions().style).toBe(style);
+        });
+    });
+
+    test("numeric", () => {
+        const en1 = new Intl.RelativeTimeFormat("en");
+        expect(en1.resolvedOptions().numeric).toBe("always");
+
+        ["always", "auto"].forEach(numeric => {
+            const en2 = new Intl.RelativeTimeFormat("en", { numeric: numeric });
+            expect(en2.resolvedOptions().numeric).toBe(numeric);
+        });
+    });
+});