# `Chronicle.Testing.Case`
[🔗](https://github.com/Cratis/Chronicle.Elixir/blob/main/lib/chronicle/testing/case.ex#L4)

`ExUnit.CaseTemplate` that starts an isolated `Chronicle.Testing.start_supervised_client/1`
before each test, puts it in the test context as `:chronicle`, and stops it in
`on_exit`. Safe under `async: true` — every test gets its own in-memory kernel
and client, and `start_supervised_client/1` always generates a unique event
store name, so tests never see one another's events.

    defmodule MyApp.AccountTest do
      use Chronicle.Testing.Case,
        event_types: [MyApp.Events.AccountOpened],
        reducers: [MyApp.Reducers.AccountReducer]

      import Chronicle.Testing.Assertions

      test "opening an account appends AccountOpened", %{chronicle: client} do
        :ok =
          Chronicle.EventSequences.EventLog.append(
            "account-1",
            %MyApp.Events.AccountOpened{},
            client: client
          )

        assert_appended(client, MyApp.Events.AccountOpened, event_source_id: "account-1")
      end
    end

Accepts the same options as `Chronicle.Testing.start_supervised_client/1`.

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*Consult [api-reference.md](api-reference.md) for complete listing*