test_notification.test_scenario()

Complexity

Conditions

3

Size

Total Lines	52
Code Lines	30

Duplication

Lines	0
Ratio	0 %

Importance

Changes

0

import pytest
def test_scenario(subject, observer):
# The client code.

    print("------ Scenario 1 ------\n")
    class ObserverA(observer):
        def update(self, a_subject) -> None:
            print("ObserverA: Reacted to the event")

    s1 = subject([])
    # o1 = observer()
    # s1.attach(o1)

    # business logic
    s1.state = 0
    s1.notify()

    print("------ Scenario 2 ------\n")
    # example 2
    class Businessubject(subject):

        def some_business_logic(self) -> None:
            """
            Usually, the subscription logic is only a fraction of what a Subject can
            really do. Subjects commonly hold some important business logic, that
            triggers a notification method whenever something important is about to
            happen (or after it).
            """
            print("\nSubject: I'm doing something important.")
            from random import randrange
            self._state = randrange(0, 10)
            print(f"Subject: My state has just changed to: {self._state}")
            self.notify()

    class ObserverB(observer):
        def update(self, a_subject) -> None:
            if a_subject.state == 0 or a_subject.state >= 2:
                print("ObserverB: Reacted to the event")

    s2 = Businessubject([])
    assert id(s1) != id(s2)
    assert id(s1._observers) != id(s2._observers)
    o1, o2 = ObserverA(), ObserverB()
    # s2.attach(o1)
    # s2.attach(o2)
    s2.add(o1, o2)
    # business logic
    print(s2._observers)
    s2.some_business_logic()
    s2.some_business_logic()

    s2.detach(o1)
    s2.some_business_logic()