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MANTENDO SANIDADE TESTANDO ESTADO @_andrewhr

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Telephony Engine

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Call Control

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Call Control App Comandos Webhooks

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Call Control App

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Call Control App POST /dial

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Call Control App POST /dial {"event": "call_initiated"}

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Call Control App POST /dial {"event": "call_initiated"} {"event”: "call_answered"}

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PROPERTY-BASED TEST

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PropEr

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PBT 101

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EXEMPLO

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test "sorts a list" do assert Enum.sort([3, 1, 2]) == [1, 2, 3] end

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test "sorts a list" do assert Enum.sort([3, 1, 2]) == [1, 2, 3] end

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test "sorts a list" do assert Enum.sort([3, 1, 2]) == [1, 2, 3] end

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test "sorts an empty list" do assert Enum.sort([]) == [] end

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test "sorts an empty list" test "sorts a list with a single item" test "sorts a list multiple equal items" test "sorts a list huge numbers" test "sorts a list negative numbers" test "sorts a big list with lots of items"

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PROPRIEDADE

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property "sorts a list" do forall x <- list(integer()) do Enum.sort(x) |> Enum.chunk_every(2, 1, :discard) |> Enum.all?(fn [a, b] -> a <= b end) end end

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property "sorts a list" do forall x <- list(integer()) do Enum.sort(x) |> Enum.chunk_every(2, 1, :discard) |> Enum.all?(fn [a, b] -> a <= b end) end end

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property "sorts a list" do forall x <- list(integer()) do Enum.sort(x) |> Enum.chunk_every(2, 1, :discard) |> Enum.all?(fn [a, b] -> a <= b end) end end

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GERADORES

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property "sorts a list" do forall x <- list(integer()) do Enum.sort(x) |> Enum.chunk_every(2, 1, :discard) |> Enum.all?(fn [a, b] -> a <= b end) end end

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list(integer())

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map(number(), binary())

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phone_number()

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dial_command()

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SHRINKING

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property "sorts a list" do forall unsorted <- list(integer()) do unsorted |> Enum.chunk_every(2, 1, :discard) |> Enum.all?(fn [a, b] -> a <= b end) end end

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Failed: After 11 test(s). [1,2,15,6] Shrinking ....(4 time(s)) [1,0]

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[1,2,15,6]

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[1,0]

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STATEFUL

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forall cmds <- commands(TestModel) do {history, state, result} = run_commands(TestModel, cmds) (result == :ok) |> aggregate(command_names(cmds)) |> when_fail(& report(cmds, state, result, history)) end

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forall cmds <- commands(TestModel) do {history, state, result} = run_commands(TestModel, cmds) (result == :ok) |> aggregate(command_names(cmds)) |> when_fail(& report(cmds, state, result, history)) end

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MODELO

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DOMAIN-DRIVEN?

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init_state/0 command/1 next_state/3 precondition/2

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V1

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V1 dial/1

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V1 dial/1

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V1 dial/1 answer/1 V2

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V1 dial/1 answer/1 V2 V3 dial/1

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V1 dial/1 answer/1 V2 V3 hangup/1 dial/1

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def initial_state() do %{available: ["+551234567890", "+551234567894", "+551234567892"]} end

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def command(%{available: numbers}) do return({:call, TestShim, :dial, [elements(numbers)]}) end

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def command(%{ongoing: ids}) do [ {:call, TestShim, :answer, [elements(ids)]}, {:call, TestShim, :hangup, [elements(ids)]} ] |> oneof() end

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def precondition(state, {:call, _, :dial, [number]}) do available?(state, number) end

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def next_state(state, call_id, {:call, _, :dial, [number]}) do state |> acquire_call(call_id, number) |> set_call_state(call_id, :ringing) end

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forall cmds <- commands(TestModel) do {history, state, result} = run_commands(TestModel, cmds) (result == :ok) |> aggregate(command_names(cmds)) |> when_fail(& report(cmds, state, result, history)) end

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ESTADO

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init_state/0 command/1 next_state/3 precondition/2 postcondition/3 :call FAIL

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{:call, TestShim, :dial, [elements(numbers)]}

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defmodule TestShim do def dial(number) do
 # magic goes here end end

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defmodule TestShim do def dial(number) do
 dial = Repo.insert!(Dial.changeset(number)) dial.call_id end end

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defmodule TestShim do def dial(number) do
 CallControl.dial(number) end end

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defmodule TestShim do def dial(number) do # build client and payload
 case Tesla.post(client, "/dial", payload) do # process response and return call_id end end end

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def postcondition(_state, {:call, _, :dial, [_]}, call_id) when is_binary(call_id) do true end

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ASYNC

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Call Control App Comandos Webhooks

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Call Control App GenServer.call/2 GenServer.reply/2

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defmodule TestShim do use GenServer def dial(number) do
 GenServer.call( __MODULE __, {:dial, number}) end end

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def handle_call({:command, :dial, number}, from, state) do {:ok, call_id} = CallControl.dial(number) # update state {:noreply, state} end

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def handle_cast({:webhook, webhook, call_id, resp}, state) do # descobre `ref` a partir dos parâmetros if ref, do: GenServer.reply(ref, resp) {:noreply, state} end

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MUTABILIDADE

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forall cmds <- commands(TestModel) do TestShim.setup_parties() {history, state, result} = run_commands(TestModel, cmds) (result == :ok) |> aggregate(command_names(cmds)) |> when_fail(& report(cmds, state, result, history)) end

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forall cmds <- commands(TestModel) do TestShim.setup_parties() {history, state, result} = run_commands(TestModel, cmds) (result == :ok) |> aggregate(command_names(cmds)) |> when_fail(& report(cmds, state, result, history)) end

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dial/1 answer/1 hangup/1 V1 V3

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dial/1 answer/1 hangup/1 V1 V3

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dial/1 answer/1 V3

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def initial_state() do %{available: ["+551234567890", "+551234567894", "+551234567892"]} end

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def initial_state() do %{init: ["+551234567890", "+551234567894", "+551234567892"]} end

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def command(%{init: numbers}) do return({:call, TestShim, :setup_parties, []}) end

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def next_state(state, _, {:call, _, :setup_parties, []}) do %{available: state[:init], ongoing: %{}, busy: %{}} end

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CASOS PROBLEMA

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def command(%{busy: numbers}) do return({:call, TestShim, :dial_busy, [elements(numbers)]}) end

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def postcondition(_state, {:call, _, :dial_busy, [_]}, {:error, :call_rejected}) do true end

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OK: Passed 100 test(s). 34% {'Elixir.CallControl.TestShim',dial,1} 21% {'Elixir.CallControl.TestShim',hangup,1} 19% {'Elixir.CallControl.TestShim',dial_busy,1} 13% {'Elixir.CallControl.TestShim',answer,1} 10% {'Elixir.CallControl.TestShim',setup_parties,0}

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MUITOS TESTES!

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DEMORA…

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POWER-TOOL

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ROI

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Obrigado! @_andrewhr