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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 attribute" do
defmodule Example2 do
defstruct step: 1
use Machinist
transitions attr: :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 of 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, attr: :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
describe "an example of a transition from any state to a specific one" do
defmodule Example5 do
defstruct state: :new
use Machinist
transitions do
from(:new, to: :registered, event: "register")
from(:registered, to: :interview_scheduled, event: "schedule_interview")
from :interview_scheduled do
to(:approved, event: "approve_interview")
to(:repproved, event: "reprove_interview")
end
from(:approved, to: :enrolled, event: "enroll")
from(_state, to: :application_expired, event: "application_expired")
end
end
test "all transitions" do
{:ok, %Example5{state: :application_expired}} =
Example5.transit(%Example5{state: :new}, event: "application_expired")
{:ok, %Example5{state: :application_expired}} =
Example5.transit(%Example5{state: :registered}, event: "application_expired")
{:ok, %Example5{state: :application_expired}} =
Example5.transit(%Example5{state: :interview_scheduled}, event: "application_expired")
{:ok, %Example5{state: :application_expired}} =
Example5.transit(%Example5{state: :approved}, event: "application_expired")
end
end
describe "a example with passing a block of transitions to from" do
defmodule Example6 do
defstruct state: :test
use Machinist
transitions do
from(:test, to: :test1, event: "test1")
from :test1 do
to(:test2, event: "test2")
to(:test3, event: "test3")
to(:test4, event: "test4")
end
end
end
test "all transitions" do
assert {:ok, example} = Example6.transit(%Example6{}, event: "test1")
assert {:ok, %Example6{state: :test2}} = Example6.transit(example, event: "test2")
assert {:ok, %Example6{state: :test3}} = Example6.transit(example, event: "test3")
assert {:ok, %Example6{state: :test4}} = Example6.transit(example, event: "test4")
end
end
end