diff --git a/test/functional-tests/node-transformers/obfuscating-transformers/obfuscating-replacers/identifier-obfuscating-replacers/BaseIdentifierObfuscatingReplacer.spec.ts b/test/functional-tests/node-transformers/obfuscating-transformers/obfuscating-replacers/identifier-obfuscating-replacers/BaseIdentifierObfuscatingReplacer.spec.ts
index e7df603d..90bc1950 100644
--- a/test/functional-tests/node-transformers/obfuscating-transformers/obfuscating-replacers/identifier-obfuscating-replacers/BaseIdentifierObfuscatingReplacer.spec.ts
+++ b/test/functional-tests/node-transformers/obfuscating-transformers/obfuscating-replacers/identifier-obfuscating-replacers/BaseIdentifierObfuscatingReplacer.spec.ts
@@ -7,12 +7,12 @@ import { readFileAsString } from '../../../../../helpers/readFileAsString';
 import { JavaScriptObfuscator } from '../../../../../../src/JavaScriptObfuscatorFacade';
 
 describe('BaseIdentifierObfuscatingReplacer', () => {
-    describe('Base rule', () => {
-        describe('Variant #1: default behaviour', () => {
+    describe('Reserved names', () => {
+        describe('Variant #1: ignore local reserved names', () => {
             let obfuscatedCode: string;
 
             before(() => {
-                const code: string = readFileAsString(__dirname + '/fixtures/simple-input.js');
+                const code: string = readFileAsString(__dirname + '/fixtures/local-reserved-names.js');
 
                 obfuscatedCode = JavaScriptObfuscator.obfuscate(
                     code,
@@ -30,5 +30,29 @@ describe('BaseIdentifierObfuscatingReplacer', () => {
                 );
             });
         });
+
+        describe('Variant #1: ignore global reserved names', () => {
+            let obfuscatedCode: string;
+
+            before(() => {
+                const code: string = readFileAsString(__dirname + '/fixtures/global-reserved-names.js');
+
+                obfuscatedCode = JavaScriptObfuscator.obfuscate(
+                    code,
+                    {
+                        ...NO_ADDITIONAL_NODES_PRESET,
+                        renameGlobals: true,
+                        reservedNames: ['[abc|ghi]']
+                    }
+                ).getObfuscatedCode();
+            });
+
+            it('Should keep reserved names without transformations when `reservedNames` option is enabled', () => {
+                assert.match(
+                    obfuscatedCode,
+                    /var *abc *= *0x1; *var *_0x([a-f0-9]){4,6} *= *0x2; *var *ghi *= *0x3;/
+                );
+            });
+        });
     });
 });
diff --git a/test/functional-tests/node-transformers/obfuscating-transformers/obfuscating-replacers/identifier-obfuscating-replacers/fixtures/global-reserved-names.js b/test/functional-tests/node-transformers/obfuscating-transformers/obfuscating-replacers/identifier-obfuscating-replacers/fixtures/global-reserved-names.js
new file mode 100644
index 00000000..22adb095
--- /dev/null
+++ b/test/functional-tests/node-transformers/obfuscating-transformers/obfuscating-replacers/identifier-obfuscating-replacers/fixtures/global-reserved-names.js
@@ -0,0 +1,3 @@
+var abc = 1;
+var def = 2;
+var ghi = 3;
\ No newline at end of file
diff --git a/test/functional-tests/node-transformers/obfuscating-transformers/obfuscating-replacers/identifier-obfuscating-replacers/fixtures/simple-input.js b/test/functional-tests/node-transformers/obfuscating-transformers/obfuscating-replacers/identifier-obfuscating-replacers/fixtures/local-reserved-names.js
similarity index 100%
rename from test/functional-tests/node-transformers/obfuscating-transformers/obfuscating-replacers/identifier-obfuscating-replacers/fixtures/simple-input.js
rename to test/functional-tests/node-transformers/obfuscating-transformers/obfuscating-replacers/identifier-obfuscating-replacers/fixtures/local-reserved-names.js
diff --git a/test/unit-tests/storages/ArrayStorage.spec.ts b/test/unit-tests/storages/ArrayStorage.spec.ts
index 89ff27ea..0a578a20 100644
--- a/test/unit-tests/storages/ArrayStorage.spec.ts
+++ b/test/unit-tests/storages/ArrayStorage.spec.ts
@@ -74,6 +74,23 @@ describe('ArrayStorage', () => {
         });
     });
 
+    describe('getStorageId', () => {
+        const storageIdRegExp: RegExp = /^[a-zA-Z0-9]{6}$/;
+
+        let storageId: string;
+
+        before(() => {
+            storage = getStorageInstance<string>();
+            storage.set(storageKey, storageValue);
+
+            storageId = storage.getStorageId();
+        });
+
+        it('should return storage id', () => {
+            assert.match(storageId, storageIdRegExp);
+        });
+    });
+
     describe('get', () => {
         describe('Variant #1: value exist', () => {
             const expectedValue: string = storageValue;
@@ -194,27 +211,62 @@ describe('ArrayStorage', () => {
     });
 
     describe('mergeWith', () => {
-        const secondStorageKey: number = 1;
-        const secondStorageValue: string = 'bar';
+        describe('Base merge', () => {
+            const secondStorageKey: number = 1;
+            const secondStorageValue: string = 'bar';
 
-        const expectedArray: string[] = [storageValue, secondStorageValue];
+            const expectedArray: string[] = [storageValue, secondStorageValue];
 
-        let array: string[];
+            let array: string[];
 
-        before(() => {
-            storage = getStorageInstance<string>();
-            storage.set(storageKey, storageValue);
+            before(() => {
+                storage = getStorageInstance<string>();
+                storage.set(storageKey, storageValue);
 
-            const secondStorage: IArrayStorage <string> = getStorageInstance<string>();
-            secondStorage.set(secondStorageKey, secondStorageValue);
+                const secondStorage: IArrayStorage <string> = getStorageInstance<string>();
+                secondStorage.set(secondStorageKey, secondStorageValue);
 
-            storage.mergeWith(secondStorage, false);
+                storage.mergeWith(secondStorage, false);
 
-            array = storage.getStorage();
+                array = storage.getStorage();
+            });
+
+            it('should merge two storages', () => {
+                assert.deepEqual(array, expectedArray);
+            });
         });
 
-        it('should merge two storages', () => {
-            assert.deepEqual(array, expectedArray);
+        describe('Merge with storage id', () => {
+            const secondStorageKey: number = 1;
+            const secondStorageValue: string = 'bar';
+
+            const expectedArray: string[] = [storageValue, secondStorageValue];
+
+            let array: string[];
+            let storageId: string;
+            let expectedStorageId: string;
+
+            before(() => {
+                storage = getStorageInstance<string>();
+                storage.set(storageKey, storageValue);
+
+                const secondStorage: IArrayStorage <string> = getStorageInstance<string>();
+                expectedStorageId = secondStorage.getStorageId();
+                secondStorage.set(secondStorageKey, secondStorageValue);
+
+                storage.mergeWith(secondStorage, true);
+
+                storageId = storage.getStorageId();
+                array = storage.getStorage();
+            });
+
+            it('should update storage id', () => {
+                assert.deepEqual(storageId, expectedStorageId);
+            });
+
+            it('should merge two storages', () => {
+                assert.deepEqual(array, expectedArray);
+            });
         });
     });
 });