diff --git a/src/dynamic-import/ns-define-own-property.case b/src/dynamic-import/ns-define-own-property.case
new file mode 100644
index 0000000000..2e909bc67f
--- /dev/null
+++ b/src/dynamic-import/ns-define-own-property.case
@@ -0,0 +1,114 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2018 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-module-namespace-exotic-objects-defineownproperty-p-desc
+desc: >
+    The [[DefineOwnProperty]] internal method returns `true` if no change is
+    requested, and `false` otherwise.
+features: [Symbol.iterator, Reflect, Symbol, Symbol.toStringTag]
+template: namespace
+---*/
+
+//- setup
+var sym = Symbol('test262');
+
+const exported = ['local1', 'renamed', 'indirect'];
+
+//- import
+import('./define-own-property_FIXTURE.js')
+//- body
+// Non-existant properties.
+
+for (const key of ['local2', 0, sym, Symbol.iterator]) {
+  assert.sameValue(
+    Reflect.defineProperty(ns, key, {}),
+    false,
+    'Reflect.defineProperty: ' + key.toString()
+  );
+  assert.throws(TypeError, function() {
+    Object.defineProperty(ns, key, {});
+  }, 'Object.defineProperty: ' + key.toString());
+}
+
+// Own properties. No change requested.
+
+for (const key of ([...exported, Symbol.toStringTag])) {
+  assert.sameValue(
+    Reflect.defineProperty(ns, key, {}),
+    true,
+    `No change requested, Reflect.defineProperty: ${key.toString()}`
+  );
+  assert.sameValue(
+    Object.defineProperty(ns, key, {}),
+    ns,
+    `No change requested, Object.defineProperty: ${key.toString()}`
+  );
+
+}
+
+assert.sameValue(
+  Reflect.defineProperty(ns, 'indirect',
+      {writable: true, enumerable: true, configurable: false}),
+  true,
+  'Reflect.defineProperty: indirect'
+);
+assert.sameValue(
+  Object.defineProperty(ns, 'indirect',
+      {writable: true, enumerable: true, configurable: false}),
+  ns,
+  'Object.defineProperty: indirect'
+);
+
+assert.sameValue(
+  Reflect.defineProperty(ns, Symbol.toStringTag,
+      {value: "Module", writable: false, enumerable: false,
+       configurable: false}),
+  true,
+  'Reflect.defineProperty: Symbol.toStringTag'
+);
+assert.sameValue(
+  Object.defineProperty(ns, Symbol.toStringTag,
+      {value: "Module", writable: false, enumerable: false,
+       configurable: false}),
+  ns,
+  'Object.defineProperty: Symbol.toStringTag'
+);
+
+
+// Own properties. Change requested.
+
+for (const key of ([...exported, Symbol.toStringTag])) {
+  assert.sameValue(
+    Reflect.defineProperty(ns, key, {value: 123}),
+    false,
+    `Change requested, Reflect.defineProperty: ${key.toString()}`
+  );
+  assert.throws(TypeError, function() {
+    Object.defineProperty(ns, key, {value: 123});
+  }, `Change requested, Object.defineProperty: ${key.toString()}`);
+}
+
+assert.sameValue(
+  Reflect.defineProperty(ns, 'indirect',
+      {writable: true, enumerable: true, configurable: true}),
+  false,
+  'Reflect.defineProperty: indirect'
+);
+assert.throws(TypeError, function() {
+  Object.defineProperty(ns, 'indirect',
+      {writable: true, enumerable: true, configurable: true});
+}, 'Object.defineProperty: indirect');
+
+assert.sameValue(
+  Reflect.defineProperty(ns, Symbol.toStringTag,
+      {value: "module", writable: false, enumerable: false,
+       configurable: false}),
+  false,
+  'Reflect.defineProperty: Symbol.toStringTag'
+);
+assert.throws(TypeError, function() {
+  Object.defineProperty(ns, Symbol.toStringTag,
+      {value: "module", writable: false, enumerable: false,
+       configurable: false});
+}, 'Object.defineProperty: Symbol.toStringTag');
diff --git a/src/dynamic-import/ns-delete-exported-init-no-strict.case b/src/dynamic-import/ns-delete-exported-init-no-strict.case
new file mode 100644
index 0000000000..f004fd78e0
--- /dev/null
+++ b/src/dynamic-import/ns-delete-exported-init-no-strict.case
@@ -0,0 +1,41 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2018 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-module-namespace-exotic-objects-delete-p
+desc: >
+    The [[Delete]] behavior for a key that describes an initialized exported
+    binding on non strict mode
+info: |
+    [...]
+    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.
+template: namespace
+flags: [noStrict]
+---*/
+
+//- import
+import('./delete-exported-init_FIXTURE.js')
+//- body
+assert.sameValue(delete ns.local1, false, 'delete: local1');
+assert.sameValue(
+  Reflect.deleteProperty(ns, 'local1'), false, 'Reflect.deleteProperty: local1'
+);
+assert.sameValue(ns.local1, 333, '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, 444, '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, 333, 'binding unmodified: indirect');
diff --git a/src/dynamic-import/ns-delete-exported-init-strict.case b/src/dynamic-import/ns-delete-exported-init-strict.case
new file mode 100644
index 0000000000..9313542718
--- /dev/null
+++ b/src/dynamic-import/ns-delete-exported-init-strict.case
@@ -0,0 +1,47 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2018 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-module-namespace-exotic-objects-delete-p
+desc: >
+    The [[Delete]] behavior for a key that describes an initialized exported
+    binding on strict mode
+info: |
+    [...]
+    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.
+template: namespace
+flags: [onlyStrict]
+---*/
+
+//- import
+import('./delete-exported-init_FIXTURE.js')
+//- body
+assert.throws(TypeError, function() {
+  delete ns.local1;
+}, 'delete: local1');
+assert.sameValue(
+  Reflect.deleteProperty(ns, 'local1'), false, 'Reflect.deleteProperty: local1'
+);
+assert.sameValue(ns.local1, 333, 'binding unmodified: local1');
+
+assert.throws(TypeError, function() {
+  delete ns.renamed;
+}, 'delete: renamed');
+assert.sameValue(
+  Reflect.deleteProperty(ns, 'renamed'), false, 'Reflect.deleteProperty: renamed'
+);
+assert.sameValue(ns.renamed, 444, 'binding unmodified: renamed');
+
+assert.throws(TypeError, function() {
+  delete ns.indirect;
+}, 'delete: indirect');
+assert.sameValue(
+  Reflect.deleteProperty(ns, 'indirect'),
+  false,
+  'Reflect.deleteProperty: indirect'
+);
+assert.sameValue(ns.indirect, 333, 'binding unmodified: indirect');
diff --git a/src/dynamic-import/ns-delete-non-exported-no-strict.case b/src/dynamic-import/ns-delete-non-exported-no-strict.case
new file mode 100644
index 0000000000..d7efe56594
--- /dev/null
+++ b/src/dynamic-import/ns-delete-non-exported-no-strict.case
@@ -0,0 +1,37 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-module-namespace-exotic-objects-delete-p
+desc: >
+    The [[Delete]] behavior for a key that does not describe an exported binding
+info: |
+    [...]
+    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.
+template: namespace
+flags: [noStrict]
+---*/
+
+//- import
+import('./empty_FIXTURE.js')
+//- body
+assert(delete ns.undef, 'delete: undef');
+assert(Reflect.deleteProperty(ns, 'undef'), 'Reflect.deleteProperty: undef');
+
+assert(delete ns.default, 'delete: default');
+assert(
+  Reflect.deleteProperty(ns, 'default'), 'Reflect.deleteProperty: default'
+);
+
+assert.sameValue(delete ns[Symbol.toStringTag], false, 'delete: Symbol.toStringTag');
+assert.sameValue(
+  Reflect.deleteProperty(ns, Symbol.toStringTag), false,
+  'Reflect.deleteProperty: Symbol.toStringTag'
+);
+
+var sym = Symbol('test262');
+assert(delete ns[sym], 'delete: symbol');
+assert(Reflect.deleteProperty(ns, sym), 'Reflect.deleteProperty: symbol');
diff --git a/src/dynamic-import/ns-delete-non-exported-strict.case b/src/dynamic-import/ns-delete-non-exported-strict.case
new file mode 100644
index 0000000000..0a819b800b
--- /dev/null
+++ b/src/dynamic-import/ns-delete-non-exported-strict.case
@@ -0,0 +1,37 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-module-namespace-exotic-objects-delete-p
+desc: >
+    The [[Delete]] behavior for a key that does not describe an exported binding
+info: |
+    [...]
+    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.
+template: namespace
+flags: [onlyStrict]
+---*/
+
+//- import
+import('./empty_FIXTURE.js')
+//- body
+assert(delete ns.undef, 'delete: undef');
+assert(Reflect.deleteProperty(ns, 'undef'), 'Reflect.deleteProperty: undef');
+
+assert(delete ns.default, 'delete: default');
+assert(
+  Reflect.deleteProperty(ns, 'default'), 'Reflect.deleteProperty: default'
+);
+
+assert.sameValue(
+    Reflect.deleteProperty(ns, Symbol.toStringTag), false,
+    'Reflect.deleteProperty: Symbol.toStringTag'
+  );
+assert.throws(TypeError, function() { delete ns[Symbol.toStringTag]; }, 'delete: Symbol.toStringTag');
+
+var sym = Symbol('test262');
+assert(delete ns[sym], 'delete: symbol');
+assert(Reflect.deleteProperty(ns, sym), 'Reflect.deleteProperty: symbol');
diff --git a/test/language/module-code/dynamic-import/ns/define-own-property_FIXTURE.js b/test/language/module-code/dynamic-import/ns/define-own-property_FIXTURE.js
new file mode 100644
index 0000000000..050f79c1d1
--- /dev/null
+++ b/test/language/module-code/dynamic-import/ns/define-own-property_FIXTURE.js
@@ -0,0 +1,7 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+export var local1;
+var local2;
+export { local2 as renamed };
+export { local1 as indirect } from './define-own-property_FIXTURE.js';
diff --git a/test/language/module-code/dynamic-import/ns/delete-exported-init_FIXTURE.js b/test/language/module-code/dynamic-import/ns/delete-exported-init_FIXTURE.js
new file mode 100644
index 0000000000..29e539daa2
--- /dev/null
+++ b/test/language/module-code/dynamic-import/ns/delete-exported-init_FIXTURE.js
@@ -0,0 +1,7 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+export var local1 = 333;
+var local2 = 444;
+export { local2 as renamed };
+export { local1 as indirect } from './delete-exported-init_FIXTURE.js';
diff --git a/test/language/module-code/dynamic-import/ns/empty_FIXTURE.js b/test/language/module-code/dynamic-import/ns/empty_FIXTURE.js
new file mode 100644
index 0000000000..96a3b85954
--- /dev/null
+++ b/test/language/module-code/dynamic-import/ns/empty_FIXTURE.js
@@ -0,0 +1,2 @@
+// Copyright (C) 2018 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.