1 files changed, 39 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/modules/module-declaration-instantiation.js b/js/src/jit-test/tests/modules/module-declaration-instantiation.js
new file mode 100644
index 000000000..de820ae5b
--- /dev/null
+++ b/js/src/jit-test/tests/modules/module-declaration-instantiation.js
@@ -0,0 +1,39 @@
+// Exercise ModuleDeclarationInstantiation() operation.
+
+load(libdir + "dummyModuleResolveHook.js");
+
+function testModuleEnvironment(module, expected) {
+    var actual = getModuleEnvironmentNames(module).sort();
+    assertEq(actual.length, expected.length);
+    for (var i = 0; i < actual.length; i++) {
+        assertEq(actual[i], expected[i]);
+    }
+}
+
+// Check the environment of an empty module.
+let m = parseModule("");
+m.declarationInstantiation();
+testModuleEnvironment(m, []);
+
+let a = moduleRepo['a'] = parseModule("var x = 1; export { x };");
+let b = moduleRepo['b'] = parseModule("import { x as y } from 'a';");
+
+a.declarationInstantiation();
+b.declarationInstantiation();
+
+testModuleEnvironment(a, ['x']);
+testModuleEnvironment(b, ['y']);
+
+// Function bindings are initialized as well as instantiated.
+let c = parseModule(`function a(x) { return x; }
+                     function b(x) { return x + 1; }
+                     function c(x) { return x + 2; }
+                     function d(x) { return x + 3; }`);
+const names = ['a', 'b', 'c', 'd'];
+testModuleEnvironment(c, names);
+names.forEach((n) => assertEq(typeof getModuleEnvironmentValue(c, n), "undefined"));
+c.declarationInstantiation();
+for (let i = 0; i < names.length; i++) {
+    let f = getModuleEnvironmentValue(c, names[i]);
+    assertEq(f(21), 21 + i);
+}