test: add vitest baseline and scene state machine skeleton

Made-with: Cursor

package.json

@@ -6,7 +6,9 @@
   "scripts": {
     "check": "taze major",
     "dev": "vite --host",
-    "build": "vite build"
+    "build": "vite build",
+    "test": "vitest run",
+    "test:watch": "vitest"
   },
   "keywords": [],
   "author": "",
@@ -21,6 +23,7 @@
   },
   "devDependencies": {
     "@pixi/devtools": "^2.0.1",
-    "typescript": "^5.5.4"
+    "typescript": "^5.5.4",
+    "vitest": "^2.1.8"
   }
 }

src/scene/SceneStateMachine.ts

@@ -0,0 +1,13 @@
+export type SceneState = "idle" | "loading";
+
+export class SceneStateMachine {
+  private state: SceneState = "idle";
+
+  getState(): SceneState {
+    return this.state;
+  }
+
+  transitionTo(nextState: SceneState): void {
+    this.state = nextState;
+  }
+}

tests/kernel/scene-state-machine.test.ts

@@ -0,0 +1,13 @@
+import { describe, expect, it } from "vitest";
+import { SceneStateMachine } from "@/scene/SceneStateMachine";
+
+describe("SceneStateMachine", () => {
+  it("starts in idle state and supports transitioning", () => {
+    const machine = new SceneStateMachine();
+
+    expect(machine.getState()).toBe("idle");
+
+    machine.transitionTo("loading");
+    expect(machine.getState()).toBe("loading");
+  });
+});

vitest.config.ts

@@ -0,0 +1,14 @@
+import path from "node:path";
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    environment: "node",
+    include: ["tests/**/*.test.ts"],
+  },
+  resolve: {
+    alias: {
+      "@": path.resolve(__dirname, "src"),
+    },
+  },
+});