input: Write a function to create a Python class named `Person` with the attributes `name` (string), `age` (integer), and `email address` (string). The class should have a function `toString()` which returns a string formatted with all the attributes. Implement the class and ensure the `toString()` function works correctly with the following assert statements.
  
  assert Person("John", 30, "john@example.com").toString() == "Name: John, Age: 30, Email: john@example.com"
  assert Person("Jane", 25, "jane@example.com").toString() == "Name: Jane, Age: 25, Email: jane@example.com"
  assert Person("", 0, "").toString() == "Name: , Age: 0, Email: "
output: class Person:
      def __init__(self, name, age, email):
          self.name = name
          self.age = age
          self.email = email
  
      def toString(self):
          return f"Name: {self.name}, Age: {self.age}, Email: {self.email}"