def test_accelerate_truck_returns_current_speed(max_speed, acceleration,
tyre_friction, current_speed):
# Arrange
truck = Truck(color="Red",
max_speed=max_speed,
acceleration=acceleration,
tyre_friction=tyre_friction,
max_cargo_weight=100)
truck.start_engine()
# Act
truck.accelerate()
# Assert
assert truck.current_speed == current_speed
def test_accelerate_truck_when_engine_started_and_update_current_speed():
# Arrange
truck = Truck(color='Blue',
max_speed=1,
acceleration=1,
tyre_friction=1,
max_cargo_weight=1)
truck.start_engine()
current_speed_value = 1
# Act
truck.accelerate()
# Assert
assert truck.current_speed == current_speed_value
def test_apply_break_when_current_speed_with_different_acceleration_more_than_tyre_friction_returns_current_speed():
# Arrange
truck = Truck(color="Red", max_speed=50, acceleration=10,
tyre_friction=3, max_cargo_weight=100)
current_speed = 27
truck.start_engine()
truck.accelerate()
truck.accelerate()
truck.accelerate()
# Act
truck.apply_brakes()
# Assert
assert truck.current_speed == current_speed
def test_load_when_truck_not_in_motion_with_invalid_load_values_raise_error():
# Arrange
truck = Truck(color='Blue',
max_speed=5,
acceleration=4,
tyre_friction=3,
max_cargo_weight=100)
truck.start_engine()
invalid_cargo_weight = "Invalid value for cargo_weight"
# Act
with pytest.raises(ValueError) as error:
truck.load(-1)
# Assert
assert str(error.value) == invalid_cargo_weight
def test_sound_horn_when_truck_engine_started_and_return_car_sound(capfd):
# Arrange
truck = Truck(color='Blue',
max_speed=5,
acceleration=4,
tyre_friction=3,
max_cargo_weight=1)
truck.start_engine()
sound = "Honk Honk\n"
# Act
truck.sound_horn()
output = capfd.readouterr()
# Assert
assert output.out == sound
def test_apply_break_when_current_speed_is_less_than_tyre_friction():
# Arrange
truck = Truck(color="Red",
max_speed=50,
acceleration=10,
tyre_friction=30,
max_cargo_weight=100)
current_speed = 0
truck.start_engine()
truck.accelerate()
# Act
truck.apply_brakes()
# Assert
assert truck.current_speed == current_speed
def test_load_when_truck_in_motion_and_print_string(capfd):
# Arrange
truck = Truck(color='Blue',
max_speed=5,
acceleration=4,
tyre_friction=3,
max_cargo_weight=100)
truck.start_engine()
truck.accelerate()
cannot_load = "Cannot load cargo during motion\n"
# Act
truck.load(1)
output = capfd.readouterr()
# Assert
assert output.out == cannot_load
def test_apply_brakes_when_truck_current_speed_is_more_than_tyre_friction_and_update_current_speed(
):
# Arrange
truck = Truck(color='Blue',
max_speed=5,
acceleration=4,
tyre_friction=3,
max_cargo_weight=1)
truck.start_engine()
truck.accelerate()
# Act
truck.apply_brakes()
current_speed_value = 1
# Assert
assert truck.current_speed == current_speed_value
def test_load_cargo_when_truck_is_stopped_and_current_speed_is_zero_returns_current_cargo_weight(
):
# Arrange
truck = Truck(color="Red",
max_speed=50,
acceleration=10,
tyre_friction=30,
max_cargo_weight=100)
truck.start_engine()
current_cargo_weight = 50
# Act
truck.stop_engine()
truck.load(50)
# Assert
assert truck.current_cargo_weight == current_cargo_weight
def test_accelerate_truck_with_different_acceleration():
# Arrange
truck = Truck(color="Red",
max_speed=50,
acceleration=10,
tyre_friction=3,
max_cargo_weight=100)
current_speed = 30
truck.start_engine()
# Act
truck.accelerate()
truck.accelerate()
truck.accelerate()
# Assert
assert truck.current_speed == current_speed
def test_load_cargo_when_truck_is_stopped_and_current_speed_is_not_zero_returns_statement(
capsys):
# Arrange
truck = Truck(color="Red",
max_speed=50,
acceleration=10,
tyre_friction=30,
max_cargo_weight=100)
truck.start_engine()
truck.accelerate()
statement = "Cannot load cargo during motion\n"
# Act
truck.stop_engine()
truck.load(50)
captured = capsys.readouterr()
# Assert
assert captured.out == statement
def test_accelerate_truck_more_than_max_speed_returns_current_speed_equal_to_max_speed(
):
# Arrange
truck = Truck(color="Red",
max_speed=50,
acceleration=10,
tyre_friction=3,
max_cargo_weight=100)
current_speed = 50
truck.start_engine()
# Act
truck.accelerate()
truck.accelerate()
truck.accelerate()
truck.accelerate()
truck.accelerate()
truck.accelerate()
truck.accelerate()
# Assert
assert truck.current_speed == current_speed
# -*- coding: utf-8 -*-
'''
The truckstop engine. This engine runs a loop that updates a variety of values
this truck.
'''
# Import python libs
import logging
import os
from truck import Truck
log = logging.getLogger(__name__)
if __name__ == '__main__':
truck_id = os.getenv('TRUCK_ID')
if truck_id:
truck = Truck(truck_id=truck_id)
truck.turn_on()
if truck.run_diagnostics()[0]:
truck.start_engine()
truck.run(frequency=2)
else:
raise Exception('Truck ID [{}] invalid'.format(truck_id))
