1 files changed, 167 insertions, 0 deletions
diff --git a/js/src/tests/Intl/DateTimeFormat/call.js b/js/src/tests/Intl/DateTimeFormat/call.js
new file mode 100644
index 0000000000..8e9603f646
--- /dev/null
+++ b/js/src/tests/Intl/DateTimeFormat/call.js
@@ -0,0 +1,167 @@
+// |reftest| skip-if(!this.hasOwnProperty("Intl"))
+
+function IsConstructor(o) {
+  try {
+    new (new Proxy(o, {construct: () => ({})}));
+    return true;
+  } catch (e) {
+    return false;
+  }
+}
+
+function IsObject(o) {
+    return Object(o) === o;
+}
+
+function thisValues() {
+    const intlConstructors = Object.getOwnPropertyNames(Intl).map(name => Intl[name]).filter(IsConstructor);
+
+    return [
+        // Primitive values.
+        ...[undefined, null, true, "abc", Symbol(), 123],
+
+        // Object values.
+        ...[{}, [], /(?:)/, function(){}, new Proxy({}, {})],
+
+        // Intl objects.
+        ...[].concat(...intlConstructors.map(ctor => [
+            // Instance of an Intl constructor.
+            new ctor(),
+
+            // Instance of a subclassed Intl constructor.
+            new class extends ctor {},
+
+            // Object inheriting from an Intl constructor prototype.
+            Object.create(ctor.prototype),
+
+            // Intl object not inheriting from its default prototype.
+            Object.setPrototypeOf(new ctor(), Object.prototype),
+        ])),
+    ];
+}
+
+const intlFallbackSymbol = Object.getOwnPropertySymbols(Intl.DateTimeFormat.call(Object.create(Intl.DateTimeFormat.prototype)))[0];
+
+// Invoking [[Call]] for Intl.DateTimeFormat returns a new instance unless called
+// with an instance inheriting from Intl.DateTimeFormat.prototype.
+for (let thisValue of thisValues()) {
+    let obj = Intl.DateTimeFormat.call(thisValue);
+
+    if (!Intl.DateTimeFormat.prototype.isPrototypeOf(thisValue)) {
+        assertEq(Object.is(obj, thisValue), false);
+        assertEq(obj instanceof Intl.DateTimeFormat, true);
+        if (IsObject(thisValue))
+            assertEqArray(Object.getOwnPropertySymbols(thisValue), []);
+    } else {
+        assertEq(Object.is(obj, thisValue), true);
+        assertEq(obj instanceof Intl.DateTimeFormat, true);
+        assertEqArray(Object.getOwnPropertySymbols(thisValue), [intlFallbackSymbol]);
+    }
+}
+
+// Intl.DateTimeFormat uses the legacy Intl constructor compromise semantics.
+// - Test when InstanceofOperator(thisValue, %DateTimeFormat%) returns true.
+for (let thisValue of thisValues()) {
+    let hasInstanceCalled = false;
+    Object.defineProperty(Intl.DateTimeFormat, Symbol.hasInstance, {
+        value() {
+            assertEq(hasInstanceCalled, false);
+            hasInstanceCalled = true;
+            return true;
+        }, configurable: true
+    });
+    if (!IsObject(thisValue)) {
+        // A TypeError is thrown when Intl.DateTimeFormat tries to install the
+        // [[FallbackSymbol]] property on |thisValue|.
+        assertThrowsInstanceOf(() => Intl.DateTimeFormat.call(thisValue), TypeError);
+        delete Intl.DateTimeFormat[Symbol.hasInstance];
+    } else {
+        let obj = Intl.DateTimeFormat.call(thisValue);
+        delete Intl.DateTimeFormat[Symbol.hasInstance];
+        assertEq(Object.is(obj, thisValue), true);
+        assertEqArray(Object.getOwnPropertySymbols(thisValue), [intlFallbackSymbol]);
+    }
+    assertEq(hasInstanceCalled, true);
+}
+// - Test when InstanceofOperator(thisValue, %DateTimeFormat%) returns false.
+for (let thisValue of thisValues()) {
+    let hasInstanceCalled = false;
+    Object.defineProperty(Intl.DateTimeFormat, Symbol.hasInstance, {
+        value() {
+            assertEq(hasInstanceCalled, false);
+            hasInstanceCalled = true;
+            return false;
+        }, configurable: true
+    });
+    let obj = Intl.DateTimeFormat.call(thisValue);
+    delete Intl.DateTimeFormat[Symbol.hasInstance];
+    assertEq(Object.is(obj, thisValue), false);
+    assertEq(obj instanceof Intl.DateTimeFormat, true);
+    if (IsObject(thisValue))
+        assertEqArray(Object.getOwnPropertySymbols(thisValue), []);
+    assertEq(hasInstanceCalled, true);
+}
+
+// Throws an error when attempting to install [[FallbackSymbol]] twice.
+{
+    let thisValue = Object.create(Intl.DateTimeFormat.prototype);
+    assertEqArray(Object.getOwnPropertySymbols(thisValue), []);
+
+    assertEq(Intl.DateTimeFormat.call(thisValue), thisValue);
+    assertEqArray(Object.getOwnPropertySymbols(thisValue), [intlFallbackSymbol]);
+
+    assertThrowsInstanceOf(() => Intl.DateTimeFormat.call(thisValue), TypeError);
+    assertEqArray(Object.getOwnPropertySymbols(thisValue), [intlFallbackSymbol]);
+}
+
+// Throws an error when the thisValue is non-extensible.
+{
+    let thisValue = Object.create(Intl.DateTimeFormat.prototype);
+    Object.preventExtensions(thisValue);
+
+    assertThrowsInstanceOf(() => Intl.DateTimeFormat.call(thisValue), TypeError);
+    assertEqArray(Object.getOwnPropertySymbols(thisValue), []);
+}
+
+// [[FallbackSymbol]] is installed as a frozen property holding an Intl.DateTimeFormat instance.
+{
+    let thisValue = Object.create(Intl.DateTimeFormat.prototype);
+    Intl.DateTimeFormat.call(thisValue);
+
+    let desc = Object.getOwnPropertyDescriptor(thisValue, intlFallbackSymbol);
+    assertEq(desc !== undefined, true);
+    assertEq(desc.writable, false);
+    assertEq(desc.enumerable, false);
+    assertEq(desc.configurable, false);
+    assertEq(desc.value instanceof Intl.DateTimeFormat, true);
+}
+
+// Ensure [[FallbackSymbol]] is installed last by changing the [[Prototype]]
+// during initialization.
+{
+    let thisValue = {};
+    let options = {
+        get hour12() {
+            Object.setPrototypeOf(thisValue, Intl.DateTimeFormat.prototype);
+            return false;
+        }
+    };
+    let obj = Intl.DateTimeFormat.call(thisValue, undefined, options);
+    assertEq(Object.is(obj, thisValue), true);
+    assertEqArray(Object.getOwnPropertySymbols(thisValue), [intlFallbackSymbol]);
+}
+{
+    let thisValue = Object.create(Intl.DateTimeFormat.prototype);
+    let options = {
+        get hour12() {
+            Object.setPrototypeOf(thisValue, Object.prototype);
+            return false;
+        }
+    };
+    let obj = Intl.DateTimeFormat.call(thisValue, undefined, options);
+    assertEq(Object.is(obj, thisValue), false);
+    assertEqArray(Object.getOwnPropertySymbols(thisValue), []);
+}
+
+if (typeof reportCompare === "function")
+    reportCompare(true, true);