diff --git a/src/index.ts b/src/index.ts
index 92c94b8..0483790 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,5 +1,22 @@
-export class Hello {
-  public sayHello() {
-    return 'hello, world!';
+import * as crypto from 'crypto';
+
+// Default
+// None (stack auto generate)
+// string
+
+// export interface Xxx {
+//   readonly naming: Naming | {functionName: string, roleName: string};
+// }
+
+export namespace ResourceNaming {
+  export enum NamingType {
+    DEFAULT,
+    NONE,
   }
-}
\ No newline at end of file
+
+  export function createRandomString(value: crypto.BinaryLike, length: number = 8) {
+    return crypto.createHash('shake256', { outputLength: (length / 2) })
+      .update(value)
+      .digest('hex');
+  }
+}
diff --git a/test/hello.test.ts b/test/hello.test.ts
deleted file mode 100644
index acbacd4..0000000
--- a/test/hello.test.ts
+++ /dev/null
@@ -1,5 +0,0 @@
-import { Hello } from '../src';
-
-test('hello', () => {
-  expect(new Hello().sayHello()).toBe('hello, world!');
-});
\ No newline at end of file
diff --git a/test/naming.test.ts b/test/naming.test.ts
new file mode 100644
index 0000000..41f35c7
--- /dev/null
+++ b/test/naming.test.ts
@@ -0,0 +1,22 @@
+import { ResourceNaming } from '../src';
+
+describe('ResouceNaming Testing', () => {
+
+  const naming = ((namingType: ResourceNaming.NamingType): string | undefined => {
+    switch (namingType) {
+      case ResourceNaming.NamingType.DEFAULT:
+        const random = ResourceNaming.createRandomString('ResourceName');
+        return `resource-name-${random}`;
+      case ResourceNaming.NamingType.NONE:
+        return undefined;
+    }
+  });
+
+  it('Is Naming Randmon String', () => {
+    expect(typeof naming(ResourceNaming.NamingType.DEFAULT)).toBe('string');
+  });
+
+  it('Is Naming undefined', () => {
+    expect(naming(ResourceNaming.NamingType.NONE)).toBeUndefined();
+  });
+});
\ No newline at end of file