Fix domain lock to be case-insensitive by normalizing domain values to lowercase (#1400)

test/functional-tests/issues/fixtures/issue1182.js

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+var result = 42;

test/functional-tests/issues/issue1182.spec.ts

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+import { assert } from 'chai';
+
+import { DomainLockRule } from '../../../src/options/normalizer-rules/DomainLockRule';
+import { IOptions } from '../../../src/interfaces/options/IOptions';
+
+//
+// https://github.com/javascript-obfuscator/javascript-obfuscator/issues/1182
+//
+describe('Issue #1182', () => {
+    describe('domainLock should be case-insensitive', () => {
+        it('should normalize mixed-case domain to lowercase', () => {
+            const options = DomainLockRule({
+                domainLock: ['Example.COM']
+            } as IOptions);
+
+            assert.deepEqual(options.domainLock, ['example.com']);
+        });
+
+        it('should normalize domain with subdomain to lowercase', () => {
+            const options = DomainLockRule({
+                domainLock: ['.Example.COM']
+            } as IOptions);
+
+            assert.deepEqual(options.domainLock, ['.example.com']);
+        });
+
+        it('should normalize multiple mixed-case domains', () => {
+            const options = DomainLockRule({
+                domainLock: ['Foo.Bar.COM', 'EXAMPLE.ORG']
+            } as IOptions);
+
+            assert.deepEqual(options.domainLock, ['foo.bar.com', 'example.org']);
+        });
+
+        it('should not change already-lowercase domains', () => {
+            const options = DomainLockRule({
+                domainLock: ['example.com']
+            } as IOptions);
+
+            assert.deepEqual(options.domainLock, ['example.com']);
+        });
+    });
+});