refactor: move pure post-editor logic to BDS.UI.PostEditor for TUI reuse (issue #26, phase 3)

test/bds/ui/post_editor_test.exs

@@ -0,0 +1,64 @@
+defmodule BDS.UI.PostEditorTest do
+  use ExUnit.Case, async: false
+
+  alias BDS.UI.PostEditor.{Draft, Metadata, Persistence}
+
+  setup do
+    :ok = Ecto.Adapters.SQL.Sandbox.checkout(BDS.Repo)
+
+    temp_dir = Path.join(System.tmp_dir!(), "bds-ui-pe-#{System.unique_integer([:positive])}")
+    File.mkdir_p!(temp_dir)
+    on_exit(fn -> File.rm_rf(temp_dir) end)
+
+    {:ok, project} = BDS.Projects.create_project(%{name: "UI PostEditor", data_path: temp_dir})
+
+    {:ok, post} =
+      BDS.Posts.create_post(%{
+        project_id: project.id,
+        title: "First Post",
+        content: "hello world",
+        tags: ["elixir"],
+        language: "en"
+      })
+
+    %{project: project, post: post}
+  end
+
+  test "persisted_form builds the canonical draft", %{post: post} do
+    metadata = Metadata.project_metadata(post.project_id)
+    form = Draft.persisted_form(post, metadata, "en")
+
+    assert form["title"] == "First Post"
+    assert form["content"] == "hello world"
+    assert form["tags"] == "elixir"
+    assert form["language"] == "en"
+  end
+
+  test "persist saves an edited draft and publish publishes it", %{post: post} do
+    metadata = Metadata.project_metadata(post.project_id)
+    form = Draft.persisted_form(post, metadata, "en")
+
+    draft = %{form | "title" => "Renamed Post", "content" => "updated body"}
+
+    assert {:ok, saved} = Persistence.persist(post, draft, "en", metadata, :save)
+    assert saved.title == "Renamed Post"
+    assert saved.status == :draft
+
+    form = Draft.persisted_form(saved, metadata, "en")
+    assert {:ok, published} = Persistence.persist(saved, form, "en", metadata, :publish)
+    assert published.status == :published
+    assert published.file_path != ""
+  end
+
+  test "discard on an unpublished draft is a no-op success", %{post: post} do
+    metadata = Metadata.project_metadata(post.project_id)
+    assert {:ok, _post} = Persistence.discard(post, "en", metadata)
+  end
+
+  test "normalize_params keeps the active language on same-language edits" do
+    params = %{"title" => "T", "language" => "DE "}
+
+    assert Draft.normalize_params(params, "de", "de")["language"] == "de"
+    assert Draft.normalize_params(params, "de", "fr")["language"] == "fr"
+  end
+end