input: Write a python function to fetch and parse HTML text from a given URL using requests and BeautifulSoup.
  assert fetch_html_text('https://example.com') != ""
  assert isinstance(fetch_html_text('https://example.com'), str)
  assert 'Example Domain' in fetch_html_text('https://example.com')
output: def fetch_html_text(url):
      import requests
      from bs4 import BeautifulSoup
  
      response = requests.get(url)
      soup = BeautifulSoup(response.text, 'html.parser')
      return soup.get_text()