test(commands): cover viewport command flow

commands/dispatcher.test.ts

@@ -0,0 +1,18 @@
+import { describe, expect, test } from "bun:test";
+import { createInitialAppState } from "@editor/initial-state";
+import { createAppStore } from "@editor/store";
+import { createCommandRegistry } from "./registry";
+import { viewportPanCommand } from "./viewport";
+
+describe("command dispatcher", () => {
+  test("throws for unknown commands", () => {
+    const store = createAppStore(createInitialAppState("Test"), createCommandRegistry([]));
+    expect(() => store.dispatch("missing", undefined)).toThrow("Unknown command: missing");
+  });
+
+  test("dispatch applies command result to store", () => {
+    const store = createAppStore(createInitialAppState("Test"), createCommandRegistry([viewportPanCommand]));
+    store.dispatch("viewport.pan", { delta: { x: 3, y: 7 } });
+    expect(store.getState().editor.viewport.center).toEqual({ x: 3, y: 7 });
+  });
+});