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  • [Python Test] Use pytest fixtures to reduce duplicated code across unit tests

    In this lesson, you will learn how to implement pytest fixtures. Many unit tests have the same resource requirements. For example, an instantiated object from a class. You will learn how to create the instance of the class one time as a fixture and reuse that object across all your tests. This results in faster tests, eliminates duplicate code, and uses less resources when running your tests.

    """
    Python class for a self-driving car.
    Suitable for disrupting automotive industry
    """
    
    class Car(object):
    
        def __init__(self, speed, state):
            self.speed = speed
            self.state = state
    
        def start(self):
            self.state = "running"
            return self.state
    
        def turn_off(self):
            self.state = "off"
            return self.state
    
        def accelerate(self):
            self.speed += 10
            return self.speed
    
        def stop(self):
            self.speed = 0
            return self.speed

    test:

    """
    Tests for Car class
    """
    
    import pytest
    from car import Car
    
    class TestCar(object):
    
        """
        default scope is "function" which means
        foreach test, it will have its own scope
        "module" ref to class itself, so it sharing
        the same instance
        """
    
        @pytest.fixture(scope="module")
        def my_car(self):
            return Car(0, "off")
    
        def test_start(self, my_car):
            my_car.start()
            assert my_car.state == "running"
    
        def test_turn_off(self, my_car):
            my_car.turn_off()
            assert my_car.state == "off"
    
        def test_accelerate(self, my_car):
            my_car.accelerate()
            assert my_car.speed == 10
    
        """
        This one will failed because we are using fixture
        scope as "module", my_car.speed == 20
        """
        def test_accelerate1(self, my_car):
            my_car.accelerate()
            assert my_car.speed == 10
    
        def test_stop(self, my_car):
            my_car.stop()
            assert my_car.speed == 0
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  • 原文地址:https://www.cnblogs.com/Answer1215/p/8460290.html
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