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diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-delete-exported-init-no-strict.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-delete-exported-init-no-strict.js
new file mode 100644
index 0000000000..5b67e2fc80
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+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-delete-exported-init-no-strict.js
@@ -0,0 +1,111 @@
+// |reftest| async
+// This file was procedurally generated from the following sources:
+// - src/dynamic-import/ns-delete-exported-init-no-strict.case
+// - src/dynamic-import/namespace/promise.template
+/*---
+description: The [[Delete]] behavior for a key that describes an initialized exported binding on non strict mode (value from promise then)
+esid: sec-finishdynamicimport
+features: [dynamic-import]
+flags: [generated, noStrict, async]
+info: |
+    Runtime Semantics: FinishDynamicImport ( referencingScriptOrModule, specifier, promiseCapability, completion )
+
+        1. If completion is an abrupt completion, ...
+        2. Otherwise,
+            ...
+            d. Let namespace be GetModuleNamespace(moduleRecord).
+            e. If namespace is an abrupt completion, perform ! Call(promiseCapability.[[Reject]], undefined, « namespace.[[Value]] »).
+            f. Otherwise, perform ! Call(promiseCapability.[[Resolve]], undefined, « namespace.[[Value]] »).
+
+    Runtime Semantics: GetModuleNamespace ( module )
+
+        ...
+        3. Let namespace be module.[[Namespace]].
+        4. If namespace is undefined, then
+            a. Let exportedNames be ? module.GetExportedNames(« »).
+            b. Let unambiguousNames be a new empty List.
+            c. For each name that is an element of exportedNames, do
+                i. Let resolution be ? module.ResolveExport(name, « »).
+                ii. If resolution is a ResolvedBinding Record, append name to unambiguousNames.
+            d. Set namespace to ModuleNamespaceCreate(module, unambiguousNames).
+        5. Return namespace.
+
+    ModuleNamespaceCreate ( module, exports )
+
+        ...
+        4. Let M be a newly created object.
+        5. Set M's essential internal methods to the definitions specified in 9.4.6.
+        7. Let sortedExports be a new List containing the same values as the list exports where the
+        values are ordered as if an Array of the same values had been sorted using Array.prototype.sort
+        using undefined as comparefn.
+        8. Set M.[[Exports]] to sortedExports.
+        9. Create own properties of M corresponding to the definitions in 26.3.
+        10. Set module.[[Namespace]] to M.
+        11. Return M.
+
+    26.3 Module Namespace Objects
+
+        A Module Namespace Object is a module namespace exotic object that provides runtime
+        property-based access to a module's exported bindings. There is no constructor function for
+        Module Namespace Objects. Instead, such an object is created for each module that is imported
+        by an ImportDeclaration that includes a NameSpaceImport.
+
+        In addition to the properties specified in 9.4.6 each Module Namespace Object has the
+        following own property:
+
+    26.3.1 @@toStringTag
+
+        The initial value of the @@toStringTag property is the String value "Module".
+
+        This property has the attributes { [[Writable]]: false, [[Enumerable]]: false, [[Configurable]]: false }.
+
+    Module Namespace Exotic Objects
+
+        A module namespace object is an exotic object that exposes the bindings exported from an
+        ECMAScript Module (See 15.2.3). There is a one-to-one correspondence between the String-keyed
+        own properties of a module namespace exotic object and the binding names exported by the
+        Module. The exported bindings include any bindings that are indirectly exported using export *
+        export items. Each String-valued own property key is the StringValue of the corresponding
+        exported binding name. These are the only String-keyed properties of a module namespace exotic
+        object. Each such property has the attributes { [[Writable]]: true, [[Enumerable]]: true,
+        [[Configurable]]: false }. Module namespace objects are not extensible.
+
+
+    [...]
+    2. If Type(P) is Symbol, then
+      a. Return ? OrdinaryDelete(O, P).
+    3. Let exports be O.[[Exports]].
+    4. If P is an element of exports, return false.
+    5. Return true.
+
+---*/
+
+import('./module-code_FIXTURE.js').then(ns => {
+
+    assert.sameValue(delete ns.default, false, 'delete: default');
+    assert.sameValue(
+      Reflect.deleteProperty(ns, 'default'), false, 'Reflect.deleteProperty: default'
+    );
+    assert.sameValue(ns.default, 42, 'binding unmodified: default');
+
+    assert.sameValue(delete ns.local1, false, 'delete: local1');
+    assert.sameValue(
+      Reflect.deleteProperty(ns, 'local1'), false, 'Reflect.deleteProperty: local1'
+    );
+    assert.sameValue(ns.local1, 'Test262', 'binding unmodified: local1');
+
+    assert.sameValue(delete ns.renamed, false, 'delete: renamed');
+    assert.sameValue(
+      Reflect.deleteProperty(ns, 'renamed'), false, 'Reflect.deleteProperty: renamed'
+    );
+    assert.sameValue(ns.renamed, 'TC39', 'binding unmodified: renamed');
+
+    assert.sameValue(delete ns.indirect, false, 'delete: indirect');
+    assert.sameValue(
+      Reflect.deleteProperty(ns, 'indirect'),
+      false,
+      'Reflect.deleteProperty: indirect'
+    );
+    assert.sameValue(ns.indirect, 'Test262', 'binding unmodified: indirect');
+
+}).then($DONE, $DONE).catch($DONE);