feat(layout): plan 01 — tile engine + view registry

1 files changed, 29 insertions, 0 deletions

diff --git a/src/features/layout/logic/panels-edit.test.ts b/src/features/layout/logic/panels-edit.test.ts
new file mode 100644
index 0000000..b4c3099
--- /dev/null
+++ b/src/features/layout/logic/panels-edit.test.ts
@@ -0,0 +1,29 @@
+import { describe, expect, it } from "vitest";
+import { addPanelOp, firstPanelView, removePanelOp, swapPanelOp } from "./panels-edit";
+
+describe("panel edit → op mapping", () => {
+  it("maps a dropdown swap to a replaceView on the panel leaf's path", () => {
+    expect(swapPanelOp([1], 2, "model")).toEqual({
+      type: "replaceView",
+      target: [1, 2],
+      view: "model",
+    });
+  });
+
+  it("maps the + button to an append insertPanel", () => {
+    expect(addPanelOp(["titlebar"], "tasks")).toEqual({
+      type: "insertPanel",
+      panels: ["titlebar"],
+      view: "tasks",
+    });
+  });
+
+  it("maps the ✕ button to a removeNode on the panel leaf's path", () => {
+    expect(removePanelOp([1], 0)).toEqual({ type: "removeNode", target: [1, 0] });
+  });
+
+  it("the + button pre-selects the first eligible view (or null when none)", () => {
+    expect(firstPanelView([{ id: "tabs" }, { id: "model" }])).toBe("tabs");
+    expect(firstPanelView([])).toBeNull();
+  });
+});