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web/test/setup.ts

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+import { vi } from "vitest";
+
+// Mock ws module - ESM interop issue with WebSocket named export
+vi.mock("ws", () => {
+  class MockWebSocketServer {
+    clients = new Set();
+    on() {}
+    close(cb) { cb?.(); }
+  }
+
+  const WebSocket = {
+    OPEN: 1,
+    CONNECTING: 0,
+    CLOSING: 2,
+    CLOSED: 3,
+  };
+
+  return {
+    WebSocketServer: MockWebSocketServer,
+    WebSocket,
+  };
+});
+
+// Mock three module - WebGL not available in jsdom
+vi.mock("three", () => {
+  class MockWebGLRenderer {
+    domElement = document.createElement("canvas");
+    setSize() {}
+    setPixelRatio() {}
+    setClearColor() {}
+    render() {}
+    dispose() {}
+  }
+
+  class MockScene {
+    add() {}
+  }
+
+  class MockPerspectiveCamera {
+    position = { z: 0 };
+    updateProjectionMatrix() {}
+  }
+
+  class MockPlaneGeometry {
+    attributes = { position: { count: 1 } };
+    computeVertexNormals() {}
+    dispose() {}
+    setAttribute() {}
+  }
+
+  class MockBufferAttribute {
+    constructor() {}
+  }
+
+  class MockShaderMaterial {
+    dispose() {}
+  }
+
+  class MockMesh {
+    rotation = { set() {} };
+    scale = { set() {}, multiplyScalar() {} };
+    position = { y: 0 };
+  }
+
+  class MockVector3 {
+    constructor() {}
+  }
+
+  class MockVector4 {
+    constructor() {}
+  }
+
+  class MockTimer {
+    update() {}
+    getDelta() { return 0.016; }
+    getElapsed() { return 0; }
+  }
+
+  return {
+    WebGLRenderer: MockWebGLRenderer,
+    Scene: MockScene,
+    PerspectiveCamera: MockPerspectiveCamera,
+    PlaneGeometry: MockPlaneGeometry,
+    BufferAttribute: MockBufferAttribute,
+    ShaderMaterial: MockShaderMaterial,
+    Mesh: MockMesh,
+    Vector3: MockVector3,
+    Vector4: MockVector4,
+    Timer: MockTimer,
+    DoubleSide: 2,
+  };
+});