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_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_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_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_accelerate_truck_when_engine_stoped_and_return_start_engine_to_accelerate(
capfd):
# Arrange
truck = Truck(color='Blue',
max_speed=1,
acceleration=1,
tyre_friction=1,
max_cargo_weight=1)
start_engine_to_accelerate = "Start the engine to accelerate\n"
# Act
truck.accelerate()
output = capfd.readouterr()
# Assert
assert output.out == start_engine_to_accelerate
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_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
