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Diffstat (limited to 'test/support/data_case.ex')
-rw-r--r-- | test/support/data_case.ex | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/test/support/data_case.ex b/test/support/data_case.ex new file mode 100644 index 0000000..76994a7 --- /dev/null +++ b/test/support/data_case.ex @@ -0,0 +1,55 @@ +defmodule MatrixAppService.DataCase do + @moduledoc """ + This module defines the setup for tests requiring + access to the application's data layer. + + You may define functions here to be used as helpers in + your tests. + + Finally, if the test case interacts with the database, + we enable the SQL sandbox, so changes done to the database + are reverted at the end of every test. If you are using + PostgreSQL, you can even run database tests asynchronously + by setting `use MatrixAppService.DataCase, async: true`, although + this option is not recommended for other databases. + """ + + use ExUnit.CaseTemplate + + using do + quote do + alias MatrixAppService.Repo + + import Ecto + import Ecto.Changeset + import Ecto.Query + import MatrixAppService.DataCase + end + end + + setup tags do + :ok = Ecto.Adapters.SQL.Sandbox.checkout(MatrixAppService.Repo) + + unless tags[:async] do + Ecto.Adapters.SQL.Sandbox.mode(MatrixAppService.Repo, {:shared, self()}) + end + + :ok + end + + @doc """ + A helper that transforms changeset errors into a map of messages. + + assert {:error, changeset} = Accounts.create_user(%{password: "short"}) + assert "password is too short" in errors_on(changeset).password + assert %{password: ["password is too short"]} = errors_on(changeset) + + """ + def errors_on(changeset) do + Ecto.Changeset.traverse_errors(changeset, fn {message, opts} -> + Regex.replace(~r"%{(\w+)}", message, fn _, key -> + opts |> Keyword.get(String.to_existing_atom(key), key) |> to_string() + end) + end) + end +end |