Write a Python function that tests a GET request to an API endpoint.
**Requirements:**
1. Make a GET request to `https://jsonplaceholder.typicode.com/users`
2. Assert the response status code is 200
3. Assert the response contains a list of users
4. Assert each user has an 'id', 'name', and 'email' field
**Hint:** Use the `requests` library and `assert` statements.