Hi everyone, i am trying to wrap my head around why the following error could appear in the test environment only:

** (DBConnection.EncodeError) Postgrex expected a binary, got %{}. Please make sure the value you are passing matches the definition in your table or in your query or convert the value accordingly.

This occures when i am trying to call Game.create_character(user, parms) in tests.
In iex -s mix everything works as intended:

{:ok,
 %Dsa.Game.Character{
   __meta__: #Ecto.Schema.Metadata<:loaded, "characters">,
   data: %Dsa.Game.CharacterData{},
   ...
 }}

I defined the embeded schema like this:

defmodule Dsa.Game.Character do
  schema "characters" do
    embeds_one :data, CharacterData
    ...
  end

  def changeset(character, attrs) do
    character
    |> cast(attrs, [])
    |> cast_embed(:data, with: &CharacterData.changeset/2)
  end
end

defmodule Dsa.Game.CharacterData do
  @primary_key false
  embedded_schema do
  end

  def changeset(data, params) do
    data
    |> cast(params, [])
  end
end

This is how i create the character via the context:

  def create_character(%User{} = user, attrs) do
    %Character{}
    |> Character.changeset(attrs)
    |> Ecto.Changeset.put_embed(:data, %{})
    |> Ecto.Changeset.put_assoc(:user, user)
    |> Repo.insert()
  end

Finally, I made sure to define :data as a map in the migration:

    create table(:characters) do
      add :data, :map, null: false
      ...
    end

Any ideas why i would the the Encode Error in the test environment but not in the App?
Any help on this is much appriciated! Thanks