diff --git a/README.md b/README.md
index 54d0909..207004a 100644
--- a/README.md
+++ b/README.md
@@ -74,6 +74,7 @@ If you would like to propose a challenge, this project is open source, so feel f
 <a href="./apps/testing-modal/README.md"><img src="https://img.shields.io/badge/20-Modal Testing-orange" alt="modal Testing"/></a>
 <a href="./apps/testing-harness/README.md"><img src="https://img.shields.io/badge/23-Harness Testing-green" alt="harness Testing"/></a>
 <a href="./apps/create-harness/README.md"><img src="https://img.shields.io/badge/24-Create Harness-orange" alt="Create harness"/></a>
+<a href="./apps/testing-checkbox/README.md"><img src="https://img.shields.io/badge/28-Checkbox Testing-green" alt="Test a simple checkbox"/></a>
 
 </br>
 <img src="https://img.shields.io/badge/Nx--gray?logo=nx" alt="nx"/>
@@ -90,7 +91,7 @@ If you would like to propose a challenge, this project is open source, so feel f
 <table>
   <tbody>
     <tr>
-      <td align="center" valign="top" width="14.28%"><a href="https://medium.com/@thomas.laforge"><img src="https://avatars.githubusercontent.com/u/30832608?s…00&u=6f0ad9676792f29fd7fe6e113df06213d384a813&v=4" width="100px;" alt="Thomas Laforge"/><br /><sub><b>Thomas Laforge</b></sub></a><br />27 🧩</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://medium.com/@thomas.laforge"><img src="https://avatars.githubusercontent.com/u/30832608?s…00&u=6f0ad9676792f29fd7fe6e113df06213d384a813&v=4" width="100px;" alt="Thomas Laforge"/><br /><sub><b>Thomas Laforge</b></sub></a><br />28 🧩</a></td>
     </tr>
   </tbody>
 </table>
diff --git a/apps/testing-checkbox/.eslintrc.json b/apps/testing-checkbox/.eslintrc.json
new file mode 100644
index 0000000..b428c22
--- /dev/null
+++ b/apps/testing-checkbox/.eslintrc.json
@@ -0,0 +1,36 @@
+{
+  "extends": ["../../.eslintrc.json"],
+  "ignorePatterns": ["!**/*"],
+  "overrides": [
+    {
+      "files": ["*.ts"],
+      "rules": {
+        "@angular-eslint/directive-selector": [
+          "error",
+          {
+            "type": "attribute",
+            "prefix": "app",
+            "style": "camelCase"
+          }
+        ],
+        "@angular-eslint/component-selector": [
+          "error",
+          {
+            "type": "element",
+            "prefix": "app",
+            "style": "kebab-case"
+          }
+        ]
+      },
+      "extends": [
+        "plugin:@nx/angular",
+        "plugin:@angular-eslint/template/process-inline-templates"
+      ]
+    },
+    {
+      "files": ["*.html"],
+      "extends": ["plugin:@nx/angular-template"],
+      "rules": {}
+    }
+  ]
+}
diff --git a/apps/testing-checkbox/README.md b/apps/testing-checkbox/README.md
new file mode 100644
index 0000000..86d5dce
--- /dev/null
+++ b/apps/testing-checkbox/README.md
@@ -0,0 +1,32 @@
+<h1>Test of a simple checkbox</h1>
+
+> Author: Thomas Laforge
+
+### Information
+
+This is the perfect example to get started with `Testing Library`.
+
+You will need to only check if the button gets enabled when clicking on the checkbox
+
+You can look into debug function to get full power of `Testing Library` like:
+
+- logRoles(...);
+- screen.debug(); // you can pass a element as input
+- screen.logTestingPlaygroundURL(); // you can pass a element as input
+
+### Submitting your work
+
+1. Fork the project
+2. clone it
+3. npm ci
+4. `npx nx serve testing-checkbox`
+5. _...work on it_
+6. Commit your work
+7. Submit a PR with a title beginning with **Answer:28** that I will review and other dev can review.
+
+<a href="https://github.com/tomalaforge/angular-challenges/pulls?q=label%3A28+label%3Aanswer"><img src="https://img.shields.io/badge/-Solutions-green" alt="testing-checkbox"/></a>
+<a href='https://github.com/tomalaforge/angular-challenges/pulls?q=label%3A28+label%3A"answer+author"'><img src="https://img.shields.io/badge/-Author solution-important" alt="testing-checkbox solution author"/></a>
+
+<!-- <a href="{Blog post url}" target="_blank" rel="noopener noreferrer"><img src="https://img.shields.io/badge/-Blog post explanation-blue" alt="testing-checkbox blog article"/></a>  -->
+
+_You can ask any question on_ <a href="https://twitter.com/laforge_toma" target="_blank" rel="noopener noreferrer"><img src="./../../logo/twitter.svg" height=20px alt="twitter"/></a>
diff --git a/apps/testing-checkbox/jest.config.ts b/apps/testing-checkbox/jest.config.ts
new file mode 100644
index 0000000..461a89c
--- /dev/null
+++ b/apps/testing-checkbox/jest.config.ts
@@ -0,0 +1,22 @@
+/* eslint-disable */
+export default {
+  displayName: 'testing-checkbox',
+  preset: '../../jest.preset.js',
+  setupFilesAfterEnv: ['<rootDir>/src/test-setup.ts'],
+  coverageDirectory: '../../coverage/apps/testing-checkbox',
+  transform: {
+    '^.+\\.(ts|mjs|js|html)$': [
+      'jest-preset-angular',
+      {
+        tsconfig: '<rootDir>/tsconfig.spec.json',
+        stringifyContentPathRegex: '\\.(html|svg)$',
+      },
+    ],
+  },
+  transformIgnorePatterns: ['node_modules/(?!.*\\.mjs$)'],
+  snapshotSerializers: [
+    'jest-preset-angular/build/serializers/no-ng-attributes',
+    'jest-preset-angular/build/serializers/ng-snapshot',
+    'jest-preset-angular/build/serializers/html-comment',
+  ],
+};
diff --git a/apps/testing-checkbox/project.json b/apps/testing-checkbox/project.json
new file mode 100644
index 0000000..6d3f734
--- /dev/null
+++ b/apps/testing-checkbox/project.json
@@ -0,0 +1,95 @@
+{
+  "name": "testing-checkbox",
+  "$schema": "../../node_modules/nx/schemas/project-schema.json",
+  "projectType": "application",
+  "prefix": "app",
+  "sourceRoot": "apps/testing-checkbox/src",
+  "tags": [],
+  "targets": {
+    "build": {
+      "executor": "@angular-devkit/build-angular:browser",
+      "outputs": ["{options.outputPath}"],
+      "options": {
+        "outputPath": "dist/apps/testing-checkbox",
+        "index": "apps/testing-checkbox/src/index.html",
+        "main": "apps/testing-checkbox/src/main.ts",
+        "polyfills": ["zone.js"],
+        "tsConfig": "apps/testing-checkbox/tsconfig.app.json",
+        "assets": [
+          "apps/testing-checkbox/src/favicon.ico",
+          "apps/testing-checkbox/src/assets"
+        ],
+        "styles": ["apps/testing-checkbox/src/styles.scss"],
+        "scripts": []
+      },
+      "configurations": {
+        "production": {
+          "budgets": [
+            {
+              "type": "initial",
+              "maximumWarning": "500kb",
+              "maximumError": "1mb"
+            },
+            {
+              "type": "anyComponentStyle",
+              "maximumWarning": "2kb",
+              "maximumError": "4kb"
+            }
+          ],
+          "outputHashing": "all"
+        },
+        "development": {
+          "buildOptimizer": false,
+          "optimization": false,
+          "vendorChunk": true,
+          "extractLicenses": false,
+          "sourceMap": true,
+          "namedChunks": true
+        }
+      },
+      "defaultConfiguration": "production"
+    },
+    "serve": {
+      "executor": "@angular-devkit/build-angular:dev-server",
+      "configurations": {
+        "production": {
+          "browserTarget": "testing-checkbox:build:production"
+        },
+        "development": {
+          "browserTarget": "testing-checkbox:build:development"
+        }
+      },
+      "defaultConfiguration": "development"
+    },
+    "extract-i18n": {
+      "executor": "@angular-devkit/build-angular:extract-i18n",
+      "options": {
+        "browserTarget": "testing-checkbox:build"
+      }
+    },
+    "lint": {
+      "executor": "@nx/linter:eslint",
+      "outputs": ["{options.outputFile}"],
+      "options": {
+        "lintFilePatterns": [
+          "apps/testing-checkbox/**/*.ts",
+          "apps/testing-checkbox/**/*.html"
+        ]
+      }
+    },
+    "test": {
+      "executor": "@nx/jest:jest",
+      "outputs": ["{workspaceRoot}/coverage/{projectRoot}"],
+      "options": {
+        "jestConfig": "apps/testing-checkbox/jest.config.ts",
+        "passWithNoTests": true
+      },
+      "configurations": {
+        "ci": {
+          "ci": true,
+          "codeCoverage": true
+        }
+      }
+    }
+  }
+}
diff --git a/apps/testing-checkbox/src/app/app.component.spec.ts b/apps/testing-checkbox/src/app/app.component.spec.ts
new file mode 100644
index 0000000..bb64b92
--- /dev/null
+++ b/apps/testing-checkbox/src/app/app.component.spec.ts
@@ -0,0 +1,10 @@
+import { render } from '@testing-library/angular';
+import { AppComponent } from './app.component';
+
+describe('AppComponent', () => {
+  describe('When checking the checkbox', () => {
+    it('Then button is enabled', async () => {
+      await render(AppComponent);
+    });
+  });
+});
diff --git a/apps/testing-checkbox/src/app/app.component.ts b/apps/testing-checkbox/src/app/app.component.ts
new file mode 100644
index 0000000..3a2eb36
--- /dev/null
+++ b/apps/testing-checkbox/src/app/app.component.ts
@@ -0,0 +1,27 @@
+import { Component } from '@angular/core';
+
+@Component({
+  standalone: true,
+  selector: 'app-root',
+  template: ` <label for="agree">Agreed</label>
+    <input
+      class="ml-2"
+      id="agree"
+      type="checkbox"
+      [value]="check"
+      (input)="toggleCheck()" />
+    <button
+      class="border p-2 rounded-lg ml-10"
+      [class.bg-gray-500]="!check"
+      [class.text-white]="!check"
+      [disabled]="!check">
+      Submit
+    </button>`,
+})
+export class AppComponent {
+  check = false;
+
+  toggleCheck() {
+    this.check = !this.check;
+  }
+}
diff --git a/apps/testing-checkbox/src/assets/.gitkeep b/apps/testing-checkbox/src/assets/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/apps/testing-checkbox/src/favicon.ico b/apps/testing-checkbox/src/favicon.ico
new file mode 100644
index 0000000..317ebcb
Binary files /dev/null and b/apps/testing-checkbox/src/favicon.ico differ
diff --git a/apps/testing-checkbox/src/index.html b/apps/testing-checkbox/src/index.html
new file mode 100644
index 0000000..c4f1121
--- /dev/null
+++ b/apps/testing-checkbox/src/index.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <title>testing-checkbox</title>
+    <base href="/" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <link rel="icon" type="image/x-icon" href="favicon.ico" />
+  </head>
+  <body>
+    <app-root></app-root>
+  </body>
+</html>
diff --git a/apps/testing-checkbox/src/main.ts b/apps/testing-checkbox/src/main.ts
new file mode 100644
index 0000000..31c5da4
--- /dev/null
+++ b/apps/testing-checkbox/src/main.ts
@@ -0,0 +1,4 @@
+import { bootstrapApplication } from '@angular/platform-browser';
+import { AppComponent } from './app/app.component';
+
+bootstrapApplication(AppComponent).catch((err) => console.error(err));
diff --git a/apps/testing-checkbox/src/styles.scss b/apps/testing-checkbox/src/styles.scss
new file mode 100644
index 0000000..77e408a
--- /dev/null
+++ b/apps/testing-checkbox/src/styles.scss
@@ -0,0 +1,5 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+/* You can add global styles to this file, and also import other style files */
diff --git a/apps/testing-checkbox/src/test-setup.ts b/apps/testing-checkbox/src/test-setup.ts
new file mode 100644
index 0000000..15de72a
--- /dev/null
+++ b/apps/testing-checkbox/src/test-setup.ts
@@ -0,0 +1,2 @@
+import '@testing-library/jest-dom';
+import 'jest-preset-angular/setup-jest';
diff --git a/apps/testing-checkbox/tailwind.config.js b/apps/testing-checkbox/tailwind.config.js
new file mode 100644
index 0000000..38183db
--- /dev/null
+++ b/apps/testing-checkbox/tailwind.config.js
@@ -0,0 +1,14 @@
+const { createGlobPatternsForDependencies } = require('@nx/angular/tailwind');
+const { join } = require('path');
+
+/** @type {import('tailwindcss').Config} */
+module.exports = {
+  content: [
+    join(__dirname, 'src/**/!(*.stories|*.spec).{ts,html}'),
+    ...createGlobPatternsForDependencies(__dirname),
+  ],
+  theme: {
+    extend: {},
+  },
+  plugins: [],
+};
diff --git a/apps/testing-checkbox/tsconfig.app.json b/apps/testing-checkbox/tsconfig.app.json
new file mode 100644
index 0000000..fff4a41
--- /dev/null
+++ b/apps/testing-checkbox/tsconfig.app.json
@@ -0,0 +1,10 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "../../dist/out-tsc",
+    "types": []
+  },
+  "files": ["src/main.ts"],
+  "include": ["src/**/*.d.ts"],
+  "exclude": ["jest.config.ts", "src/**/*.test.ts", "src/**/*.spec.ts"]
+}
diff --git a/apps/testing-checkbox/tsconfig.editor.json b/apps/testing-checkbox/tsconfig.editor.json
new file mode 100644
index 0000000..8ae117d
--- /dev/null
+++ b/apps/testing-checkbox/tsconfig.editor.json
@@ -0,0 +1,7 @@
+{
+  "extends": "./tsconfig.json",
+  "include": ["src/**/*.ts"],
+  "compilerOptions": {
+    "types": ["jest", "node"]
+  }
+}
diff --git a/apps/testing-checkbox/tsconfig.json b/apps/testing-checkbox/tsconfig.json
new file mode 100644
index 0000000..e01cf19
--- /dev/null
+++ b/apps/testing-checkbox/tsconfig.json
@@ -0,0 +1,32 @@
+{
+  "compilerOptions": {
+    "target": "es2022",
+    "useDefineForClassFields": false,
+    "forceConsistentCasingInFileNames": true,
+    "strict": true,
+    "noImplicitOverride": true,
+    "noPropertyAccessFromIndexSignature": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true
+  },
+  "files": [],
+  "include": [],
+  "references": [
+    {
+      "path": "./tsconfig.app.json"
+    },
+    {
+      "path": "./tsconfig.spec.json"
+    },
+    {
+      "path": "./tsconfig.editor.json"
+    }
+  ],
+  "extends": "../../tsconfig.base.json",
+  "angularCompilerOptions": {
+    "enableI18nLegacyMessageIdFormat": false,
+    "strictInjectionParameters": true,
+    "strictInputAccessModifiers": true,
+    "strictTemplates": true
+  }
+}
diff --git a/apps/testing-checkbox/tsconfig.spec.json b/apps/testing-checkbox/tsconfig.spec.json
new file mode 100644
index 0000000..1a4817a
--- /dev/null
+++ b/apps/testing-checkbox/tsconfig.spec.json
@@ -0,0 +1,15 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "../../dist/out-tsc",
+    "module": "commonjs",
+    "types": ["jest", "node", "@testing-library/jest-dom"]
+  },
+  "files": ["src/test-setup.ts"],
+  "include": [
+    "jest.config.ts",
+    "src/**/*.test.ts",
+    "src/**/*.spec.ts",
+    "src/**/*.d.ts"
+  ]
+}