1 files changed, 105 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/modules/import-namespace.js b/js/src/jit-test/tests/modules/import-namespace.js
new file mode 100644
index 000000000..f44d4568a
--- /dev/null
+++ b/js/src/jit-test/tests/modules/import-namespace.js
@@ -0,0 +1,105 @@
+// Test importing module namespaces
+
+"use strict";
+
+load(libdir + "asserts.js");
+load(libdir + "iteration.js");
+load(libdir + "dummyModuleResolveHook.js");
+
+function parseAndEvaluate(source) {
+    let m = parseModule(source);
+    m.declarationInstantiation();
+    return m.evaluation();
+}
+
+function testHasNames(names, expected) {
+    assertEq(names.length, expected.length);
+    expected.forEach(function(name) {
+        assertEq(names.includes(name), true);
+    });
+}
+
+let a = moduleRepo['a'] = parseModule(
+    `export var a = 1;
+     export var b = 2;`
+);
+
+let b = moduleRepo['b'] = parseModule(
+    `import * as ns from 'a';
+     export { ns };
+     export var x = ns.a + ns.b;`
+);
+
+b.declarationInstantiation();
+b.evaluation();
+testHasNames(getModuleEnvironmentNames(b), ["ns", "x"]);
+let ns = getModuleEnvironmentValue(b, "ns");
+testHasNames(Object.keys(ns), ["a", "b"]);
+assertEq(getModuleEnvironmentValue(b, "x"), 3);
+
+// Test module namespace internal methods as defined in 9.4.6
+assertEq(Object.getPrototypeOf(ns), null);
+assertThrowsInstanceOf(() => Object.setPrototypeOf(ns, null), TypeError);
+assertThrowsInstanceOf(function() { ns.foo = 1; }, TypeError);
+assertEq(Object.isExtensible(ns), false);
+Object.preventExtensions(ns);
+let desc = Object.getOwnPropertyDescriptor(ns, "a");
+assertEq(desc.value, 1);
+assertEq(desc.writable, true);
+assertEq(desc.enumerable, true);
+assertEq(desc.configurable, false);
+assertEq(typeof desc.get, "undefined");
+assertEq(typeof desc.set, "undefined");
+assertThrowsInstanceOf(function() { ns.a = 1; }, TypeError);
+delete ns.foo;
+assertThrowsInstanceOf(function() { delete ns.a; }, TypeError);
+
+// Test @@toStringTag property
+desc = Object.getOwnPropertyDescriptor(ns, Symbol.toStringTag);
+assertEq(desc.value, "Module");
+assertEq(desc.writable, false);
+assertEq(desc.enumerable, false);
+assertEq(desc.configurable, true);
+assertEq(typeof desc.get, "undefined");
+assertEq(typeof desc.set, "undefined");
+assertEq(Object.prototype.toString.call(ns), "[object Module]");
+
+// Test @@iterator method.
+let iteratorFun = ns[Symbol.iterator];
+assertEq(iteratorFun.name, "[Symbol.iterator]");
+
+let iterator = ns[Symbol.iterator]();
+assertEq(iterator[Symbol.iterator](), iterator);
+assertIteratorNext(iterator, "a");
+assertIteratorNext(iterator, "b");
+assertIteratorDone(iterator);
+
+// The iterator's next method can only be called on the object it was originally
+// associated with.
+iterator = ns[Symbol.iterator]();
+let iterator2 = ns[Symbol.iterator]();
+assertThrowsInstanceOf(() => iterator.next.call({}), TypeError);
+assertThrowsInstanceOf(() => iterator.next.call(iterator2), TypeError);
+assertEq(iterator.next.call(iterator).value, "a");
+assertEq(iterator2.next.call(iterator2).value, "a");
+
+// Test cyclic namespace import and access in module evaluation.
+let c = moduleRepo['c'] =
+    parseModule("export let c = 1; import * as ns from 'd'; let d = ns.d;");
+let d = moduleRepo['d'] =
+    parseModule("export let d = 2; import * as ns from 'c'; let c = ns.c;");
+c.declarationInstantiation();
+d.declarationInstantiation();
+assertThrowsInstanceOf(() => c.evaluation(), ReferenceError);
+
+// Test cyclic namespace import.
+let e = moduleRepo['e'] =
+    parseModule("export let e = 1; import * as ns from 'f'; export function f() { return ns.f }");
+let f = moduleRepo['f'] =
+    parseModule("export let f = 2; import * as ns from 'e'; export function e() { return ns.e }");
+e.declarationInstantiation();
+f.declarationInstantiation();
+e.evaluation();
+f.evaluation();
+assertEq(e.namespace.f(), 2);
+assertEq(f.namespace.e(), 1);