diff --git a/package-lock.json b/package-lock.json
index 5d230c3..5e32b35 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,12 +11,47 @@
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+      "license": "MIT",
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+        "tslib": "^2.4.0"
+      }
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+      "resolved": "https://registry.npmjs.org/@emnapi/wasi-threads/-/wasi-threads-1.2.1.tgz",
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@@ -498,6 +533,317 @@
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+        "url": "https://github.com/sponsors/Brooooooklyn"
+      },
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@@ -887,6 +1233,42 @@
         "win32"
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+      "license": "MIT"
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
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@@ -894,6 +1276,119 @@
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+        "@rolldown/binding-linux-arm64-gnu": "1.0.2",
+        "@rolldown/binding-linux-arm64-musl": "1.0.2",
+        "@rolldown/binding-linux-ppc64-gnu": "1.0.2",
+        "@rolldown/binding-linux-s390x-gnu": "1.0.2",
+        "@rolldown/binding-linux-x64-gnu": "1.0.2",
+        "@rolldown/binding-linux-x64-musl": "1.0.2",
+        "@rolldown/binding-openharmony-arm64": "1.0.2",
+        "@rolldown/binding-wasm32-wasi": "1.0.2",
+        "@rolldown/binding-win32-arm64-msvc": "1.0.2",
+        "@rolldown/binding-win32-x64-msvc": "1.0.2"
+      }
+    },
     "node_modules/rollup": {
       "version": "4.60.4",
       "resolved": "https://registry.npmjs.org/rollup/-/rollup-4.60.4.tgz",
@@ -1351,6 +2276,13 @@
         "tslib": "^2.1.0"
       }
     },
+    "node_modules/siginfo": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/siginfo/-/siginfo-2.0.0.tgz",
+      "integrity": "sha512-ybx0WO1/8bSBLEWXZvEd7gMW3Sn3JFlW3TvX1nREbDLRNQNaeNN8WK0meBwPdAaOI7TtRRRJn/Es1zhrrCHu7g==",
+      "dev": true,
+      "license": "ISC"
+    },
     "node_modules/source-map": {
       "version": "0.7.6",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.7.6.tgz",
@@ -1361,6 +2293,30 @@
         "node": ">= 12"
       }
     },
+    "node_modules/source-map-js": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",
+      "integrity": "sha512-UXWMKhLOwVKb728IUtQPXxfYU+usdybtUrK/8uGE8CQMvrhOpwvzDBwj0QhSL7MQc7vIsISBG8VQ8+IDQxpfQA==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/stackback": {
+      "version": "0.0.2",
+      "resolved": "https://registry.npmjs.org/stackback/-/stackback-0.0.2.tgz",
+      "integrity": "sha512-1XMJE5fQo1jGH6Y/7ebnwPOBEkIEnT4QF32d5R1+VXdXveM0IBMJt8zfaxX1P3QhVwrYe+576+jkANtSS2mBbw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/std-env": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/std-env/-/std-env-4.1.0.tgz",
+      "integrity": "sha512-Rq7ybcX2RuC55r9oaPVEW7/xu3tj8u4GeBYHBWCychFtzMIr86A7e3PPEBPT37sHStKX3+TiX/Fr/ACmJLVlLQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/sucrase": {
       "version": "3.35.1",
       "resolved": "https://registry.npmjs.org/sucrase/-/sucrase-3.35.1.tgz",
@@ -1407,6 +2363,13 @@
         "node": ">=0.8"
       }
     },
+    "node_modules/tinybench": {
+      "version": "2.9.0",
+      "resolved": "https://registry.npmjs.org/tinybench/-/tinybench-2.9.0.tgz",
+      "integrity": "sha512-0+DUvqWMValLmha6lr4kD8iAMK1HzV0/aKnCtWb9v9641TnP/MFb7Pc2bxoxQjTXAErryXVgUOfv2YqNllqGeg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/tinyexec": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-0.3.2.tgz",
@@ -1431,6 +2394,16 @@
         "url": "https://github.com/sponsors/SuperchupuDev"
       }
     },
+    "node_modules/tinyrainbow": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/tinyrainbow/-/tinyrainbow-3.1.0.tgz",
+      "integrity": "sha512-Bf+ILmBgretUrdJxzXM0SgXLZ3XfiaUuOj/IKQHuTXip+05Xn+uyEYdVg0kYDipTBcLrCVyUzAPz7QmArb0mmw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
     "node_modules/tree-kill": {
       "version": "1.2.2",
       "resolved": "https://registry.npmjs.org/tree-kill/-/tree-kill-1.2.2.tgz",
@@ -1528,6 +2501,201 @@
       "integrity": "sha512-JFNbkD1Svwe0KvGi8GOeLcP4kAWQ609twvCdcHxq1oSL8svv39ZuSvajcD8B+5D0eL4+s1Is2D/O6KN3qcTeRA==",
       "dev": true,
       "license": "MIT"
+    },
+    "node_modules/vite": {
+      "version": "8.0.14",
+      "resolved": "https://registry.npmjs.org/vite/-/vite-8.0.14.tgz",
+      "integrity": "sha512-s4BJJ+5y1pYL6Otw51FHhVJQhPnuRinKig64g/1+EUNaJsd3gCKdD31IPFvswUgW9/60QT9oFHbZHbQK5imcxw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "lightningcss": "^1.32.0",
+        "picomatch": "^4.0.4",
+        "postcss": "^8.5.15",
+        "rolldown": "1.0.2",
+        "tinyglobby": "^0.2.16"
+      },
+      "bin": {
+        "vite": "bin/vite.js"
+      },
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      },
+      "funding": {
+        "url": "https://github.com/vitejs/vite?sponsor=1"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.3"
+      },
+      "peerDependencies": {
+        "@types/node": "^20.19.0 || >=22.12.0",
+        "@vitejs/devtools": "^0.1.18",
+        "esbuild": "^0.27.0 || ^0.28.0",
+        "jiti": ">=1.21.0",
+        "less": "^4.0.0",
+        "sass": "^1.70.0",
+        "sass-embedded": "^1.70.0",
+        "stylus": ">=0.54.8",
+        "sugarss": "^5.0.0",
+        "terser": "^5.16.0",
+        "tsx": "^4.8.1",
+        "yaml": "^2.4.2"
+      },
+      "peerDependenciesMeta": {
+        "@types/node": {
+          "optional": true
+        },
+        "@vitejs/devtools": {
+          "optional": true
+        },
+        "esbuild": {
+          "optional": true
+        },
+        "jiti": {
+          "optional": true
+        },
+        "less": {
+          "optional": true
+        },
+        "sass": {
+          "optional": true
+        },
+        "sass-embedded": {
+          "optional": true
+        },
+        "stylus": {
+          "optional": true
+        },
+        "sugarss": {
+          "optional": true
+        },
+        "terser": {
+          "optional": true
+        },
+        "tsx": {
+          "optional": true
+        },
+        "yaml": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/vitest": {
+      "version": "4.1.7",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-4.1.7.tgz",
+      "integrity": "sha512-flYyaFd2CgoCoU+0UKt3pxksgC+S02iTDN0n3LtqaMeXsI9SBcdNujc2k0DeFLzUn/0k538yNjOSdwgCqcrwJA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@vitest/expect": "4.1.7",
+        "@vitest/mocker": "4.1.7",
+        "@vitest/pretty-format": "4.1.7",
+        "@vitest/runner": "4.1.7",
+        "@vitest/snapshot": "4.1.7",
+        "@vitest/spy": "4.1.7",
+        "@vitest/utils": "4.1.7",
+        "es-module-lexer": "^2.0.0",
+        "expect-type": "^1.3.0",
+        "magic-string": "^0.30.21",
+        "obug": "^2.1.1",
+        "pathe": "^2.0.3",
+        "picomatch": "^4.0.3",
+        "std-env": "^4.0.0-rc.1",
+        "tinybench": "^2.9.0",
+        "tinyexec": "^1.0.2",
+        "tinyglobby": "^0.2.15",
+        "tinyrainbow": "^3.1.0",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0",
+        "why-is-node-running": "^2.3.0"
+      },
+      "bin": {
+        "vitest": "vitest.mjs"
+      },
+      "engines": {
+        "node": "^20.0.0 || ^22.0.0 || >=24.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@opentelemetry/api": "^1.9.0",
+        "@types/node": "^20.0.0 || ^22.0.0 || >=24.0.0",
+        "@vitest/browser-playwright": "4.1.7",
+        "@vitest/browser-preview": "4.1.7",
+        "@vitest/browser-webdriverio": "4.1.7",
+        "@vitest/coverage-istanbul": "4.1.7",
+        "@vitest/coverage-v8": "4.1.7",
+        "@vitest/ui": "4.1.7",
+        "happy-dom": "*",
+        "jsdom": "*",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@opentelemetry/api": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser-playwright": {
+          "optional": true
+        },
+        "@vitest/browser-preview": {
+          "optional": true
+        },
+        "@vitest/browser-webdriverio": {
+          "optional": true
+        },
+        "@vitest/coverage-istanbul": {
+          "optional": true
+        },
+        "@vitest/coverage-v8": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        },
+        "vite": {
+          "optional": false
+        }
+      }
+    },
+    "node_modules/vitest/node_modules/tinyexec": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-1.2.3.tgz",
+      "integrity": "sha512-g62dB+w1/OEFnPvmX0yd/HnetYITOL+1nJW7kitOycOeAvmbWC/nu0fwmmQ/kupNojqExzyC/T++pST/jRJ2mQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/why-is-node-running": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 39eb6b9..d256b98 100644
--- a/package.json
+++ b/package.json
@@ -19,6 +19,7 @@
   "scripts": {
     "build": "tsup",
     "dev": "tsup --watch",
+    "test": "vitest run",
     "prepublishOnly": "npm run build"
   },
   "peerDependencies": {
@@ -27,7 +28,8 @@
   "devDependencies": {
     "rxjs": "^7.8.1",
     "tsup": "^8.3.5",
-    "typescript": "^5.6.0"
+    "typescript": "^5.6.0",
+    "vitest": "^4.1.7"
   },
   "keywords": [
     "ecs",
diff --git a/test/smoke.ts b/test/smoke.ts
deleted file mode 100644
index 47759e6..0000000
--- a/test/smoke.ts
+++ /dev/null
@@ -1,132 +0,0 @@
-import {
-  World,
-  defineComponent,
-  query,
-  QueryUpdate,
-  WorldEvent,
-} from "../src/index";
-
-// ── Define components ─────────────────────────────────
-const Position = defineComponent({ x: 0, y: 0 });
-const Velocity = defineComponent({ vx: 0, vy: 0 });
-const Health = defineComponent({ current: 100, max: 100 });
-const Dead = defineComponent({ timestamp: 0 });
-
-// Type inference check
-const _p: { x: number; y: number } = Position.defaults;
-
-// ── World setup ──────────────────────────────────────
-const world = new World();
-
-let events: WorldEvent[] = [];
-world.events$.subscribe((e) => events.push(e));
-
-// ── Entity lifecycle ─────────────────────────────────
-const player = world.spawn();
-const enemy = world.spawn();
-
-console.assert(events.length === 2, "spawn events");
-console.assert(events[0].type === "spawned" && events[0].entity === player);
-console.assert(events[1].type === "spawned" && events[1].entity === enemy);
-
-console.assert(world.isAlive(player), "player alive");
-console.assert(world.isAlive(enemy), "enemy alive");
-console.assert(world.entityCount === 2, "two entities");
-
-// ── Add components ───────────────────────────────────
-const pos = world.add(player, Position, { x: 10, y: 20 });
-world.add(player, Velocity, { vx: 1, vy: 0 });
-world.add(enemy, Position, { x: 50, y: 0 });
-world.add(enemy, Health, { current: 50 });
-
-console.assert(pos.x === 10 && pos.y === 20, "add with init");
-console.assert(world.has(player, Position), "has Position");
-console.assert(world.has(player, Velocity), "has Velocity");
-console.assert(!world.has(player, Health), "no Health");
-console.assert(events.length === 6, "component add events");
-
-// ── Sync query ───────────────────────────────────────
-const movable = [...world.query(query(Position, Velocity))];
-console.assert(movable.length === 1, "player only in movable");
-console.assert(movable[0] === player);
-
-const allPos = [...world.query(query(Position))];
-console.assert(allPos.length === 2, "both have Position");
-
-// ── Observable query ─────────────────────────────────
-const queryLog: QueryUpdate[] = [];
-world.observe(query(Position, Velocity)).subscribe((u) => {
-  if (u.added.length || u.removed.length || u.changed.length) {
-    queryLog.push(u);
-  }
-});
-
-// ── Mutation + change tracking ───────────────────────
-world.get(player, Position).x += 5;
-world.markDirty(player, Position);
-world.get(player, Velocity).vx *= 2;
-world.markDirty(player, Velocity);
-
-// flush should emit componentChanged events and update queries
-world.flush();
-
-console.assert(
-  events.some((e) => e.type === "componentChanged"),
-  "change events",
-);
-
-// The query observer should have received changed: [player]
-const lastUpdate = queryLog[queryLog.length - 1];
-console.assert(
-  lastUpdate.changed.length === 1 && lastUpdate.changed[0] === player,
-  "player in changed",
-);
-
-// ── Remove component ─────────────────────────────────
-world.remove(player, Velocity);
-
-console.assert(!world.has(player, Velocity), "Velocity removed");
-const movableAfter = [...world.query(query(Position, Velocity))];
-console.assert(movableAfter.length === 0, "no one movable after remove");
-
-// The observer should have emitted {removed: [player]}
-const remUpdate = queryLog[queryLog.length - 1];
-console.assert(
-  remUpdate.removed.length === 1 && remUpdate.removed[0] === player,
-  "player removed from query",
-);
-
-// ── Destroy ──────────────────────────────────────────
-world.destroy(enemy);
-console.assert(!world.isAlive(enemy), "enemy destroyed");
-console.assert(world.entityCount === 1, "one entity left");
-
-// ── componentChanged query update ────────────────────
-// Add enemy back, observe query(Health).without(Dead)
-const enemy2 = world.spawn();
-world.add(enemy2, Health, { current: 75 });
-
-const healthLog: QueryUpdate[] = [];
-world.observe(query(Health).without(Dead)).subscribe((u) => {
-  healthLog.push(u);
-});
-
-// Enemy won't be in the initial seed yet (subscribe happened after spawn)
-// Let's add Dead to trigger the removal
-world.add(enemy2, Dead, { timestamp: 123 });
-world.flush();
-
-console.assert(
-  healthLog.some((u) => u.removed[0] === enemy2),
-  "enemy removed from health-not-dead query after gaining Dead",
-);
-
-// ── Entity recycling ─────────────────────────────────
-world.destroy(player);
-const recycled = world.spawn();
-
-console.assert(recycled !== player, "recycled entity has new generation");
-console.assert(world.isAlive(recycled), "recycled entity is alive");
-console.assert(!world.isAlive(player), "old handle is dead");
-
-console.log("✅ All smoke tests passed.");
diff --git a/test/world.test.ts b/test/world.test.ts
new file mode 100644
index 0000000..731f715
--- /dev/null
+++ b/test/world.test.ts
@@ -0,0 +1,360 @@
+import { describe, it, expect, beforeEach } from "vitest";
+import {
+  World,
+  defineComponent,
+  query,
+  type QueryUpdate,
+  type WorldEvent,
+} from "../src/index";
+
+// ── Components ──────────────────────────────────────
+const Position = defineComponent({ x: 0, y: 0 });
+const Velocity = defineComponent({ vx: 0, vy: 0 });
+const Health = defineComponent({ current: 100, max: 100 });
+const Dead = defineComponent({ timestamp: 0 });
+
+// ── Helpers ────────────────────────────────────────
+function collectUpdates(obs$: { subscribe: Function }): QueryUpdate[] {
+  const log: QueryUpdate[] = [];
+  obs$.subscribe((u: QueryUpdate) => {
+    if (u.added.length || u.removed.length || u.changed.length) log.push(u);
+  });
+  return log;
+}
+
+function collectEvents(world: World): WorldEvent[] {
+  const log: WorldEvent[] = [];
+  world.events$.subscribe((e: WorldEvent) => log.push(e));
+  return log;
+}
+
+// ── Entity lifecycle ───────────────────────────────
+describe("Entity lifecycle", () => {
+  let world: World;
+
+  beforeEach(() => {
+    world = new World();
+  });
+
+  it("spawns entities", () => {
+    const e = world.spawn();
+    expect(world.isAlive(e)).toBe(true);
+    expect(world.entityCount).toBe(1);
+  });
+
+  it("emits spawn event", () => {
+    const events = collectEvents(world);
+    const e = world.spawn();
+    expect(events).toHaveLength(1);
+    expect(events[0]).toMatchObject({ type: "spawned", entity: e });
+  });
+
+  it("destroys entities", () => {
+    const e = world.spawn();
+    world.destroy(e);
+    expect(world.isAlive(e)).toBe(false);
+    expect(world.entityCount).toBe(0);
+  });
+
+  it("emits destroy event", () => {
+    const events = collectEvents(world);
+    const e = world.spawn();
+    world.destroy(e);
+    expect(events).toHaveLength(2);
+    expect(events[1]).toMatchObject({ type: "destroyed", entity: e });
+  });
+
+  it("recycles entity indices with generation bump", () => {
+    const a = world.spawn();
+    world.destroy(a);
+    const b = world.spawn();
+    expect(b).not.toBe(a);
+    expect(world.isAlive(b)).toBe(true);
+    expect(world.isAlive(a)).toBe(false);
+  });
+
+  it("throws on operations with dead entity", () => {
+    const e = world.spawn();
+    world.destroy(e);
+    expect(() => world.get(e, Position)).toThrow("not alive");
+    expect(() => world.has(e, Position)).not.toThrow(); // has() is safe
+  });
+});
+
+// ── Components ──────────────────────────────────────
+describe("Components", () => {
+  let world: World;
+  let entity = 0 as any;
+
+  beforeEach(() => {
+    world = new World();
+    entity = world.spawn();
+  });
+
+  it("add returns defaults", () => {
+    const pos = world.add(entity, Position);
+    expect(pos).toEqual({ x: 0, y: 0 });
+  });
+
+  it("add overrides defaults with init", () => {
+    const pos = world.add(entity, Position, { x: 10, y: 20 });
+    expect(pos.x).toBe(10);
+    expect(pos.y).toBe(20);
+  });
+
+  it("get returns the live mutable object", () => {
+    world.add(entity, Position, { x: 5 });
+    const pos = world.get(entity, Position);
+    pos.x = 99;
+    expect(world.get(entity, Position).x).toBe(99);
+  });
+
+  it("tryGet returns undefined when absent", () => {
+    expect(world.tryGet(entity, Position)).toBeUndefined();
+    world.add(entity, Position);
+    expect(world.tryGet(entity, Position)).toEqual({ x: 0, y: 0 });
+  });
+
+  it("has checks component presence", () => {
+    expect(world.has(entity, Position)).toBe(false);
+    world.add(entity, Position);
+    expect(world.has(entity, Position)).toBe(true);
+  });
+
+  it("remove removes the component", () => {
+    world.add(entity, Position);
+    world.remove(entity, Position);
+    expect(world.has(entity, Position)).toBe(false);
+  });
+
+  it("remove is idempotent", () => {
+    expect(() => world.remove(entity, Position)).not.toThrow();
+  });
+
+  it("set replaces and marks dirty", () => {
+    world.add(entity, Position);
+    world.set(entity, Position, { x: 42, y: 99 });
+    expect(world.get(entity, Position)).toEqual({ x: 42, y: 99 });
+  });
+
+  it("set throws if component not added first", () => {
+    expect(() => world.set(entity, Position, { x: 1, y: 2 })).toThrow(
+      "Use add()",
+    );
+  });
+
+  it("emits componentAdded event", () => {
+    const events = collectEvents(world);
+    world.add(entity, Position);
+    expect(events.find((e) => e.type === "componentAdded")).toMatchObject({
+      type: "componentAdded",
+      entity,
+    });
+  });
+
+  it("emits componentRemoved event", () => {
+    world.add(entity, Position);
+    const events = collectEvents(world);
+    world.remove(entity, Position);
+    expect(events.find((e) => e.type === "componentRemoved")).toMatchObject({
+      type: "componentRemoved",
+      entity,
+    });
+  });
+});
+
+// ── Queries ─────────────────────────────────────────
+describe("Sync queries", () => {
+  let world: World;
+
+  beforeEach(() => {
+    world = new World();
+  });
+
+  it("returns matching entities", () => {
+    const a = world.spawn();
+    world.add(a, Position);
+    world.add(a, Velocity);
+
+    const b = world.spawn();
+    world.add(b, Position);
+
+    const result = [...world.query(query(Position, Velocity))];
+    expect(result).toEqual([a]);
+  });
+
+  it("returns empty when no match", () => {
+    const e = world.spawn();
+    world.add(e, Position);
+    const result = [...world.query(query(Position, Velocity))];
+    expect(result).toHaveLength(0);
+  });
+
+  it("excludes with .without()", () => {
+    const a = world.spawn();
+    world.add(a, Health);
+    world.add(a, Dead);
+
+    const b = world.spawn();
+    world.add(b, Health);
+
+    const result = [...world.query(query(Health).without(Dead))];
+    expect(result).toEqual([b]);
+  });
+});
+
+// ── Observable queries ──────────────────────────────
+describe("Observable queries", () => {
+  let world: World;
+
+  beforeEach(() => {
+    world = new World();
+  });
+
+  it("emits added when an entity later matches", () => {
+    const log = collectUpdates(world.observe(query(Position)));
+    const e = world.spawn();
+    world.add(e, Position);
+    expect(log).toHaveLength(1);
+    expect(log[0].added).toEqual([e]);
+    expect(log[0].removed).toEqual([]);
+  });
+
+  it("emits removed when an entity stops matching", () => {
+    const e = world.spawn();
+    world.add(e, Position);
+
+    const log = collectUpdates(world.observe(query(Position)));
+    world.remove(e, Position);
+    expect(log).toHaveLength(1);
+    expect(log[0].removed).toEqual([e]);
+  });
+
+  it("emits removed on entity destroy", () => {
+    const e = world.spawn();
+    world.add(e, Position);
+
+    const log = collectUpdates(world.observe(query(Position)));
+    world.destroy(e);
+    expect(log).toHaveLength(1);
+    expect(log[0].removed).toEqual([e]);
+  });
+
+  it("emits changed on matching entities after flush", () => {
+    const e = world.spawn();
+    world.add(e, Position);
+
+    const log = collectUpdates(world.observe(query(Position)));
+    world.get(e, Position).x += 1;
+    world.markDirty(e, Position);
+    world.flush();
+
+    expect(log).toHaveLength(1);
+    expect(log[0].changed).toEqual([e]);
+  });
+
+  it("seeds with currently matching entities on subscribe", () => {
+    const e = world.spawn();
+    world.add(e, Position);
+
+    // Next subscription should know e already matches
+    const log = collectUpdates(world.observe(query(Position)));
+
+    // Remove to trigger an event
+    world.remove(e, Position);
+    expect(log).toHaveLength(1);
+    expect(log[0].removed).toEqual([e]);
+  });
+
+  it("handles .without() queries", () => {
+    const e = world.spawn();
+    world.add(e, Health);
+
+    const log = collectUpdates(world.observe(query(Health).without(Dead)));
+
+    world.add(e, Dead);
+    expect(log).toHaveLength(1);
+    expect(log[0].removed).toEqual([e]);
+  });
+});
+
+// ── Change tracking ─────────────────────────────────
+describe("Change tracking", () => {
+  let world: World;
+
+  beforeEach(() => {
+    world = new World();
+  });
+
+  it("emits componentChanged on flush", () => {
+    const e = world.spawn();
+    world.add(e, Position);
+
+    const events = collectEvents(world);
+    world.get(e, Position).x = 42;
+    world.markDirty(e, Position);
+    world.flush();
+
+    expect(events.some((ev) => ev.type === "componentChanged")).toBe(true);
+  });
+
+  it("batches multiple dirty marks into one flush", () => {
+    const a = world.spawn();
+    const b = world.spawn();
+    world.add(a, Position);
+    world.add(b, Position);
+
+    let changeCount = 0;
+    world.observe(query(Position)).subscribe((u) => {
+      changeCount += u.changed.length;
+    });
+
+    world.markDirty(a, Position);
+    world.markDirty(b, Position);
+    world.flush();
+
+    expect(changeCount).toBe(2);
+  });
+
+  it("set() implicitly marks dirty", () => {
+    const e = world.spawn();
+    world.add(e, Position);
+
+    const log = collectUpdates(world.observe(query(Position)));
+    world.set(e, Position, { x: 1, y: 2 });
+    world.flush();
+
+    expect(log).toHaveLength(1);
+    expect(log[0].changed).toEqual([e]);
+  });
+
+  it("clears dirty after flush", () => {
+    const e = world.spawn();
+    world.add(e, Position);
+
+    let changeCount = 0;
+    world.observe(query(Position)).subscribe((u) => {
+      changeCount += u.changed.length;
+    });
+
+    world.markDirty(e, Position);
+    world.flush();
+    expect(changeCount).toBe(1);
+
+    world.flush();
+    expect(changeCount).toBe(1); // no new emissions
+  });
+});
+
+// ── TypeScript inference ────────────────────────────
+describe("Type safety", () => {
+  it("infers component type from defaults", () => {
+    const Shield = defineComponent({ armor: 5, broken: false });
+    const s = Shield.defaults;
+    // compile-time check: these should be the inferred types
+    const _armor: number = s.armor;
+    const _broken: boolean = s.broken;
+    expect(typeof _armor).toBe("number");
+    expect(typeof _broken).toBe("boolean");
+  });
+});
diff --git a/vitest.config.ts b/vitest.config.ts
new file mode 100644
index 0000000..8b5840a
--- /dev/null
+++ b/vitest.config.ts
@@ -0,0 +1,7 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    include: ["test/**/*.test.ts"],
+  },
+});