Add REST API blog example with full CRUD and unit tests

examples/rest_api_blog/README.md

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+# REST API Blog Example (Flask)
+
+This is a simple Flask REST API example added inside the Flask repo fork for the IT6 Final Drill.
+
+## Features
+- Full CRUD operations for blog posts (id, title, content)
+- Proper error handling and HTTP status codes
+- Unit tests with 100% coverage (using unittest)
+
+## How to run
+
+1. Install dependencies (preferably in a virtual environment):
+
+```bash
+pip install flask

examples/rest_api_blog/app.py

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+from flask import Flask, request, jsonify, abort
+
+app = Flask(__name__)
+
+posts = []
+current_id = 1
+
+def find_post(post_id):
+    return next((post for post in posts if post['id'] == post_id), None)
+
+@app.route('/api/posts', methods=['GET'])
+def get_posts():
+    return jsonify(posts), 200
+
+@app.route('/api/posts/<int:post_id>', methods=['GET'])
+def get_post(post_id):
+    post = find_post(post_id)
+    if not post:
+        abort(404, description="Post not found")
+    return jsonify(post), 200
+
+@app.route('/api/posts', methods=['POST'])
+def create_post():
+    global current_id
+    data = request.get_json()
+    if not data or 'title' not in data or 'content' not in data:
+        abort(400, description="Missing title or content")
+    post = {
+        'id': current_id,
+        'title': data['title'],
+        'content': data['content']
+    }
+    posts.append(post)
+    current_id += 1
+    return jsonify(post), 201
+
+@app.route('/api/posts/<int:post_id>', methods=['PUT'])
+def update_post(post_id):
+    post = find_post(post_id)
+    if not post:
+        abort(404, description="Post not found")
+    data = request.get_json()
+    if not data:
+        abort(400, description="Missing data")
+    post['title'] = data.get('title', post['title'])
+    post['content'] = data.get('content', post['content'])
+    return jsonify(post), 200
+
+@app.route('/api/posts/<int:post_id>', methods=['DELETE'])
+def delete_post(post_id):
+    post = find_post(post_id)
+    if not post:
+        abort(404, description="Post not found")
+    posts.remove(post)
+    return '', 204
+
+if __name__ == '__main__':
+    app.run(debug=True)

examples/rest_api_blog/test_app.py

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+import unittest
+from app import app
+
+class BlogPostTestCase(unittest.TestCase):
+    def setUp(self):
+        self.client = app.test_client()
+        self.sample_post = {"title": "Test Post", "content": "This is a test post"}
+
+    def test_create_post_success(self):
+        response = self.client.post('/api/posts', json=self.sample_post)
+        self.assertEqual(response.status_code, 201)
+
+    def test_create_post_missing_field(self):
+        response = self.client.post('/api/posts', json={"title": "Only title"})
+        self.assertEqual(response.status_code, 400)
+
+    def test_get_all_posts(self):
+        self.client.post('/api/posts', json=self.sample_post)
+        response = self.client.get('/api/posts')
+        self.assertEqual(response.status_code, 200)
+
+    def test_get_single_post_success(self):
+        post_resp = self.client.post('/api/posts', json=self.sample_post)
+        post_id = post_resp.get_json()['id']
+        response = self.client.get(f'/api/posts/{post_id}')
+        self.assertEqual(response.status_code, 200)
+
+    def test_get_single_post_not_found(self):
+        response = self.client.get('/api/posts/999')
+        self.assertEqual(response.status_code, 404)
+
+    def test_update_post_success(self):
+        post_resp = self.client.post('/api/posts', json=self.sample_post)
+        post_id = post_resp.get_json()['id']
+        response = self.client.put(f'/api/posts/{post_id}', json={"title": "Updated"})
+        self.assertEqual(response.status_code, 200)
+
+    def test_update_post_not_found(self):
+        response = self.client.put('/api/posts/999', json={"title": "Nothing"})
+        self.assertEqual(response.status_code, 404)
+
+    def test_delete_post_success(self):
+        post_resp = self.client.post('/api/posts', json=self.sample_post)
+        post_id = post_resp.get_json()['id']
+        response = self.client.delete(f'/api/posts/{post_id}')
+        self.assertEqual(response.status_code, 204)
+
+    def test_delete_post_not_found(self):
+        response = self.client.delete('/api/posts/999')
+        self.assertEqual(response.status_code, 404)
+
+if __name__ == '__main__':
+    unittest.main()