1 files changed, 114 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 0000000000..c5eee00fd1
--- /dev/null
+++ b/js/src/jit-test/tests/modules/import-namespace.js
@@ -0,0 +1,114 @@
+// |jit-test| --enable-top-level-await;
+// Test importing module namespaces
+
+"use strict";
+
+load(libdir + "asserts.js");
+load(libdir + "iteration.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);
+    });
+}
+
+function testEqualArrays(actual, expected) {
+	assertEq(Array.isArray(actual), true);
+	assertEq(Array.isArray(expected), true);
+    assertEq(actual.length, expected.length);
+    for (let i = 0; i < expected.length; i++) {
+    	assertEq(actual[i], expected[i]);
+    }
+}
+
+let a = registerModule('a', parseModule(
+    `// Reflection methods should return these exports alphabetically sorted.
+     export var b = 2;
+     export var a = 1;`
+));
+
+let b = registerModule('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(ns.a, 1);
+assertEq(ns.b, 2);
+assertEq(ns.c, undefined);
+assertEq(getModuleEnvironmentValue(b, "x"), 3);
+
+// Test module namespace internal methods as defined in 9.4.6
+assertEq(Object.getPrototypeOf(ns), null);
+assertEq(Reflect.setPrototypeOf(ns, null), true);
+assertEq(Reflect.setPrototypeOf(ns, Object.prototype), false);
+assertThrowsInstanceOf(() => Object.setPrototypeOf(ns, {}), 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, false);
+assertEq(typeof desc.get, "undefined");
+assertEq(typeof desc.set, "undefined");
+assertEq(Object.prototype.toString.call(ns), "[object Module]");
+
+// Test [[OwnPropertyKeys]] internal method.
+testEqualArrays(Reflect.ownKeys(ns), ["a", "b", Symbol.toStringTag]);
+testEqualArrays(Object.getOwnPropertyNames(ns), ["a", "b"]);
+testEqualArrays(Object.getOwnPropertySymbols(ns), [Symbol.toStringTag]);
+
+// Test cyclic namespace import and access in module evaluation.
+let c = registerModule('c',
+    parseModule("export let c = 1; import * as ns from 'd'; let d = ns.d;"));
+let d = registerModule('d',
+    parseModule("export let d = 2; import * as ns from 'c'; let c = ns.c;"));
+c.declarationInstantiation();
+d.declarationInstantiation();
+c.evaluation()
+  .then(r => {
+    // We expect the evaluation to throw, so we should not reach this.
+    assertEq(false, true)
+  })
+  .catch(e => {
+   assertEq(e instanceof ReferenceError, true)
+  });
+
+// Test cyclic namespace import.
+let e = registerModule('e',
+    parseModule("export let e = 1; import * as ns from 'f'; export function f() { return ns.f }"));
+let f = registerModule('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);
+drainJobQueue();