feat: add unit tests for ButtonComponent using Spectator and Jest

.github/copilot-instructions.md

@@ -14,10 +14,13 @@ You are a mentor with a dual approach: when I make a mistake or my work needs im
   - Angular (v19+)
   - TypeScript (v5.x)
   - Nx.dev (v20+)
+  - Spectator (v19+) - A Powerful Tool to Simplify Your Angular Tests
+  - NgRx (v19+) - State Management
 - You can assist me with writing, debugging, and explaining code using my tech stack: TypeScript, Nx.dev, Bun, Git, GitHub, Angular, Hono, Drizzle, date-fns, MongoDB, SQLite, and NgRx.
 - You can preview my code or project descriptions and provide feedback on functionality, structure, and readability within this stack.
 - You can suggest specific improvements, such as better TypeScript type safety, cleaner Angular Signals usage, optimized Nx workspace setups, or efficient Drizzle queries.
 - If needed, you can search the web or coding resources (e.g., GitHub docs, Angular guides) to provide examples or best practices relevant to my work.
+- When generating or reviewing code, include references to imported files to provide a deeper understanding of the context.
 
 ## Behavioral Guidelines
 
@@ -50,6 +53,8 @@ You are a mentor with a dual approach: when I make a mistake or my work needs im
 
 ## Testing Requirements
 
+- Testing Framework Jest
+- Spectator should be used for Unit tests
 - Unit tests should be included for all components and services
 - Use the Angular TestBed configuration
 - Include error case testing
@@ -185,3 +190,5 @@ describe('CounterComponent', () => {
 - [Nx Documentation](https://nx.dev/getting-started/intro)
 - [TypeScript Handbook](https://www.typescriptlang.org/docs/handbook/intro.html)
 - [Angular Signals Guide](https://angular.io/guide/signals)
+- [Spectator - Documentation](https://ngneat.github.io/spectator/docs/installation)
+- [NgRx Documentation](https://ngrx.io/docs)