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machinist_test.exs
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machinist_test.exs
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defmodule MachinistTest do
use ExUnit.Case, async: true
# doctest Machinist
describe "a default example" do
defmodule Example1 do
defstruct state: 1
use Machinist
transitions do
from(1, to: 2, event: "next")
from(2, to: 3, event: "next")
end
end
test "all transitions" do
assert {:ok, %Example1{state: 2} = step_2} = Example1.transit(%Example1{}, event: "next")
assert {:ok, %Example1{state: 3} = step_3} = Example1.transit(step_2, event: "next")
assert {:error, :not_allowed} = Example1.transit(step_3, event: "next")
end
end
describe "an example with custom state field" do
defmodule Example2 do
defstruct step: 1
use Machinist
transitions field: :step do
from(1, to: 2, event: "next")
from(2, to: 3, event: "next")
end
end
test "all transitions" do
assert {:ok, %Example2{step: 2} = step_2} = Example2.transit(%Example2{}, event: "next")
assert {:ok, %Example2{step: 3} = step_3} = Example2.transit(step_2, event: "next")
assert {:error, :not_allowed} = Example2.transit(step_3, event: "next")
end
end
describe "an example with two modules handling the same struct" do
defmodule Candidate do
defstruct state: :new
end
defmodule SelectionProcess.V1 do
defstruct step: 1
use Machinist
transitions Candidate do
from(:new, to: :registered, event: "register")
from(:registered, to: :enrolled, event: "enroll")
end
end
defmodule SelectionProcess.V2 do
defstruct step: 1
use Machinist
transitions Candidate do
from(:new, to: :registered, event: "register")
from(:registered, to: :interviewed, event: "interviewed")
from(:interviewed, to: :enrolled, event: "enroll")
end
end
test "all transitions for V1" do
{:ok, %Candidate{state: :registered} = registered_candidate} =
SelectionProcess.V1.transit(%Candidate{}, event: "register")
{:ok, %Candidate{state: :enrolled} = enrolled_candidate} =
SelectionProcess.V1.transit(registered_candidate, event: "enroll")
{:error, :not_allowed} =
SelectionProcess.V1.transit(registered_candidate, event: "register")
{:error, :not_allowed} = SelectionProcess.V1.transit(enrolled_candidate, event: "enroll")
end
test "all transitions for V2" do
{:ok, %Candidate{state: :registered} = registered_candidate} =
SelectionProcess.V2.transit(%Candidate{}, event: "register")
{:ok, %Candidate{state: :interviewed} = interviewed_candidate} =
SelectionProcess.V2.transit(registered_candidate, event: "interviewed")
{:ok, %Candidate{state: :enrolled} = enrolled_candidate} =
SelectionProcess.V2.transit(interviewed_candidate, event: "enroll")
{:error, :not_allowed} = SelectionProcess.V2.transit(%Candidate{}, event: "enroll")
{:error, :not_allowed} =
SelectionProcess.V2.transit(registered_candidate, event: "register")
{:error, :not_allowed} = SelectionProcess.V2.transit(enrolled_candidate, event: "enroll")
{:error, :not_allowed} = SelectionProcess.V2.transit(enrolled_candidate, event: "register")
end
end
describe "an example a module handling a different struct with custom state attr" do
defmodule User do
defstruct step: 1
end
defmodule Example4 do
use Machinist
transitions User, field: :step do
from(1, to: 2, event: "next")
end
end
test "all transitions" do
{:ok, %User{step: 2} = user_step2} = Example4.transit(%User{}, event: "next")
{:error, :not_allowed} = Example4.transit(user_step2, event: "next")
end
end
end