exercism/elixir/remote-control-car/test/remote_control_car_test.exs

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2023-12-23 04:18:08 +00:00
defmodule FakeRemoteControlCar do
defstruct battery_percentage: 100,
distance_driven_in_meters: 0,
nickname: nil
end
defmodule RemoteControlCarTest do
use ExUnit.Case
@tag task_id: 1
test "required key 'nickname' should not have a default value" do
assert_raise ArgumentError, fn ->
quote do
%RemoteControlCar{}
end
|> Code.eval_quoted()
end
end
@tag task_id: 1
test "new" do
car = RemoteControlCar.new()
assert car.__struct__ == RemoteControlCar
assert car.battery_percentage == 100
assert car.distance_driven_in_meters == 0
assert car.nickname == "none"
end
@tag task_id: 2
test "new with nickname" do
nickname = "Red"
car = RemoteControlCar.new(nickname)
assert car.__struct__ == RemoteControlCar
assert car.battery_percentage == 100
assert car.distance_driven_in_meters == 0
assert car.nickname == nickname
end
@tag task_id: 3
test "display distance raises error when not given struct" do
fake_car = %{
battery_percentage: 100,
distance_driven_in_meters: 0,
nickname: "Fake"
}
assert_raise(FunctionClauseError, fn ->
RemoteControlCar.display_distance(fake_car)
end)
end
@tag task_id: 3
test "display distance raises error when given unexpected struct" do
fake_car = %FakeRemoteControlCar{
battery_percentage: 100,
distance_driven_in_meters: 0,
nickname: "Fake"
}
assert_raise(FunctionClauseError, fn ->
RemoteControlCar.display_distance(fake_car)
end)
end
@tag task_id: 3
test "display distance of new" do
car = RemoteControlCar.new()
assert RemoteControlCar.display_distance(car) == "0 meters"
end
@tag task_id: 3
test "display distance of driven" do
car = RemoteControlCar.new()
car = %{car | distance_driven_in_meters: 20}
assert RemoteControlCar.display_distance(car) == "20 meters"
end
@tag task_id: 4
test "display battery raises error when not given struct" do
fake_car = %{
battery_percentage: 100,
distance_driven_in_meters: 0,
nickname: "Fake"
}
assert_raise(FunctionClauseError, fn ->
RemoteControlCar.display_battery(fake_car)
end)
end
@tag task_id: 4
test "display battery raises error when given unexpected struct" do
fake_car = %FakeRemoteControlCar{
battery_percentage: 100,
distance_driven_in_meters: 0,
nickname: "Fake"
}
assert_raise(FunctionClauseError, fn ->
RemoteControlCar.display_battery(fake_car)
end)
end
@tag task_id: 4
test "display battery of new" do
car = RemoteControlCar.new()
assert RemoteControlCar.display_battery(car) == "Battery at 100%"
end
@tag task_id: 4
test "display battery of dead battery" do
car = RemoteControlCar.new()
car = %{car | battery_percentage: 0}
assert RemoteControlCar.display_battery(car) == "Battery empty"
end
@tag task_id: 5
test "drive raises error when not given struct" do
fake_car = %{
battery_percentage: 100,
distance_driven_in_meters: 0,
nickname: "Fake"
}
assert_raise(FunctionClauseError, fn ->
RemoteControlCar.drive(fake_car)
end)
end
@tag task_id: 5
test "drive raises error when given unexpected struct" do
fake_car = %FakeRemoteControlCar{
battery_percentage: 100,
distance_driven_in_meters: 0,
nickname: "Fake"
}
assert_raise(FunctionClauseError, fn ->
RemoteControlCar.drive(fake_car)
end)
end
@tag task_id: 5
test "drive with battery" do
car = RemoteControlCar.new() |> RemoteControlCar.drive()
assert car.__struct__ == RemoteControlCar
assert car.battery_percentage == 99
assert car.distance_driven_in_meters == 20
end
@tag task_id: 6
test "drive with dead battery" do
car =
RemoteControlCar.new()
|> Map.put(:battery_percentage, 0)
|> RemoteControlCar.drive()
assert car.__struct__ == RemoteControlCar
assert car.battery_percentage == 0
assert car.distance_driven_in_meters == 0
end
end