feat(commands): add selection commands

commands/selection.test.ts

@@ -0,0 +1,25 @@
+import { describe, expect, test } from "bun:test";
+import { createInitialAppState } from "@editor/initial-state";
+import { selectionAddLayerCommand, selectionClearCommand, selectionSetCommand } from "./selection";
+
+describe("selection commands", () => {
+  test("sets selection", () => {
+    const next = selectionSetCommand.execute({ state: createInitialAppState("Test") }, { artboardId: "a1", layerIds: ["l1"] });
+    expect(next.editor.selection).toEqual({ artboardId: "a1", layerIds: ["l1"] });
+  });
+
+  test("adds unique layer selection", () => {
+    const selected = selectionSetCommand.execute({ state: createInitialAppState("Test") }, { layerIds: ["l1"] });
+    const next = selectionAddLayerCommand.execute({ state: selected }, { layerId: "l2" });
+    const same = selectionAddLayerCommand.execute({ state: next }, { layerId: "l2" });
+
+    expect(next.editor.selection.layerIds).toEqual(["l1", "l2"]);
+    expect(same).toBe(next);
+  });
+
+  test("clears selection", () => {
+    const selected = selectionSetCommand.execute({ state: createInitialAppState("Test") }, { artboardId: "a1", layerIds: ["l1"] });
+    const next = selectionClearCommand.execute({ state: selected }, undefined);
+    expect(next.editor.selection).toEqual({ layerIds: [] });
+  });
+});