input: 
  from flask import Flask, render_template, request, redirect
  import sqlite3
  
  app = Flask(__name__)
  
  @app.route('/')
  def home():
   return render_template('index.html')
  
  @app.route('/submit', methods=['POST'])
  def submit():
   name = request.form.get('name')
   email = request.form.get('email')
   phone = request.form.get('phone')
   
   conn = sqlite3.connect('data.db')
   cur = conn.cursor()
   
   cur.execute("INSERT INTO data (name, email, phone) VALUES (?, ?, ?)", (name, email, phone))
   conn.commit()
   
   return redirect('/')
  	
  if __name__ == '__main__':
   app.run(debug=True)
  
  
  Create a function that, given a Flask web application with routes for rendering a form and handling form submissions, tests if the form submission logic correctly inserts user-submitted data into a SQLite database.
  
  
  from flask import Flask, request
  import sqlite3
  
  def test_form_submission(app: Flask) -> bool:
      """
      Test if the Flask web application correctly inserts form data into the SQLite database.
      >>> app = Flask(__name__)
      >>> app.add_url_rule('/', 'home', lambda: "Home Page")
      >>> app.add_url_rule('/submit', 'submit', submit, methods=['POST'])
      >>> test_form_submission(app)
      True
      """
      with app.test_client() as client:
          response = client.post('/submit', data={'name': 'John', 'email': 'john@example.com', 'phone': '1234567890'})
          if response.status_code != 302:
              return False
          
          conn = sqlite3.connect('data.db')
          cur = conn.cursor()
          cur.execute("SELECT * FROM data WHERE name = 'John'")
          result = cur.fetchone()
          
          return result is not None
  
output:     
      with app.test_client() as client:
          response = client.post('/submit', data={'name': 'John', 'email': 'john@example.com', 'phone': '1234567890'})
          if response.status_code != 302:
              return False
          
          conn = sqlite3.connect('data.db')
          cur = conn.cursor()
          cur.execute("SELECT * FROM data WHERE name = 'John'")
          result = cur.fetchone()
          
          return result is not None
  