diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 79d011f..42f6ae9 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -18,3 +18,5 @@ jobs:
       - run: npm install
 
       - run: npx tsc --noEmit
+
+      - run: npx tsc -p tsconfig.test.json
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..8b3cfbc
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,20 @@
+name: Test
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  dispatch:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+
+      - run: npm install
+
+      - run: npm test
diff --git a/package.json b/package.json
index 54af788..ae6c228 100644
--- a/package.json
+++ b/package.json
@@ -37,11 +37,14 @@
     "build": "tsc",
     "clean": "rm -rf dist",
     "prepare": "npm run build",
-    "smoke": "tsx smoke_tests/smoke.ts"
+    "smoke": "tsx smoke_tests/smoke.ts",
+    "test": "vitest run"
   },
   "devDependencies": {
+    "@types/node": "^25.6.0",
     "tsx": "^4.21.0",
-    "typescript": "^5.4.0"
+    "typescript": "^5.4.0",
+    "vitest": "^4.1.5"
   },
   "engines": {
     "node": ">=22.0.0"
diff --git a/src/types.ts b/src/types.ts
index c0cbb45..d70e55a 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -354,29 +354,38 @@ export interface WsMessage {
 }
 
 export type WsEventType =
-  | "session.connected"
-  | "session.heartbeat"
-  | "match.state"
-  | "match.joined"
-  | "match.left"
-  | "match.input"
-  | "matchmaker.queued"
-  | "matchmaker.removed"
-  | "chat.message"
   | "chat.joined"
   | "chat.left"
+  | "chat.message"
   | "dm.message"
   | "dm.sent"
-  | "world.list"
-  | "world.joined"
-  | "world.left"
-  | "world.tick"
-  | "world.terrain"
-  | "presence.updated"
+  | "error"
+  | "match.finished"
+  | "match.joined"
+  | "match.left"
+  | "match.matched"
+  | "match.matchmaker_expired"
+  | "match.matchmaker_failed"
+  | "match.state"
+  | "match.vote_result"
+  | "match.vote_start"
+  | "match.vote_tally"
+  | "match.vote_vetoed"
+  | "matchmaker.queued"
+  | "matchmaker.removed"
   | "notification.new"
+  | "presence.updated"
+  | "session.connected"
+  | "session.heartbeat"
   | "vote.cast_ok"
   | "vote.veto_ok"
-  | "error";
+  | "world.finished"
+  | "world.joined"
+  | "world.left"
+  | "world.list"
+  | "world.phase_changed"
+  | "world.terrain"
+  | "world.tick";
 
 export interface AsobiClientOptions {
   baseUrl: string;
diff --git a/test/dispatch.test.ts b/test/dispatch.test.ts
new file mode 100644
index 0000000..4383490
--- /dev/null
+++ b/test/dispatch.test.ts
@@ -0,0 +1,146 @@
+// Dispatch unit test: feeds every canonical fixture through the SDK's
+// WebSocket message handler and asserts the right listener fires.
+//
+// Pure unit test — no network. Catches doc-vs-server drift bugs (e.g.
+// server emits `match.matched` but SDK's WsEventType union or docs only
+// mention `matchmaker.matched`) before any user reports a silent failure.
+
+import { describe, it, expect } from "vitest";
+import { readFileSync, readdirSync } from "node:fs";
+import { join } from "node:path";
+import { AsobiWebSocket } from "../src/websocket.js";
+
+const FIXTURE_DIR = join(__dirname, "fixtures");
+
+// Canonical wire types emitted by the server. Mirrors the asobi protocol
+// fixture corpus at asobi/priv/protocol/fixtures/.
+const EXPECTED: ReadonlySet<string> = new Set([
+  "chat.joined",
+  "chat.left",
+  "chat.message",
+  "dm.message",
+  "dm.sent",
+  "error",
+  "match.finished",
+  "match.joined",
+  "match.left",
+  "match.matched",
+  "match.matchmaker_expired",
+  "match.matchmaker_failed",
+  "match.state",
+  "match.vote_result",
+  "match.vote_start",
+  "match.vote_tally",
+  "match.vote_vetoed",
+  "matchmaker.queued",
+  "matchmaker.removed",
+  "notification.new",
+  "presence.updated",
+  "session.connected",
+  "session.heartbeat",
+  "vote.cast_ok",
+  "vote.veto_ok",
+  "world.finished",
+  "world.joined",
+  "world.left",
+  "world.list",
+  "world.phase_changed",
+  "world.terrain",
+  "world.tick",
+]);
+
+function listFixtureTypes(): string[] {
+  return readdirSync(FIXTURE_DIR)
+    .filter((f) => f.endsWith(".json"))
+    .map((f) => f.replace(/\.json$/, ""))
+    .sort();
+}
+
+function newClient(): AsobiWebSocket {
+  return new AsobiWebSocket({ url: "ws://example.invalid", token: "t" });
+}
+
+function feed(ws: AsobiWebSocket, raw: string): void {
+  // handleMessage is private; reach in for the test. Same pattern the
+  // sibling Lua/Defold SDK dispatch tests use.
+  (ws as unknown as { handleMessage: (raw: string) => void }).handleMessage(
+    raw,
+  );
+}
+
+describe("protocol dispatch", () => {
+  const fixtureTypes = listFixtureTypes();
+
+  it("has fixtures", () => {
+    expect(fixtureTypes.length).toBeGreaterThan(0);
+  });
+
+  it("every fixture has an EXPECTED entry", () => {
+    const missing = fixtureTypes.filter((t) => !EXPECTED.has(t));
+    expect(missing, `fixtures with no EXPECTED entry: ${missing.join(", ")}`)
+      .toEqual([]);
+  });
+
+  it("every EXPECTED entry has a fixture", () => {
+    const have = new Set(fixtureTypes);
+    const missing = [...EXPECTED].filter((t) => !have.has(t));
+    expect(missing, `EXPECTED entries with no fixture: ${missing.join(", ")}`)
+      .toEqual([]);
+  });
+
+  for (const mtype of fixtureTypes) {
+    it(`${mtype} -> on("${mtype}") fires`, () => {
+      const raw = readFileSync(join(FIXTURE_DIR, `${mtype}.json`), "utf8");
+      const ws = newClient();
+      let fired = false;
+      let received: Record<string, unknown> | null = null;
+      ws.on(mtype, (payload) => {
+        fired = true;
+        received = payload;
+      });
+      feed(ws, raw);
+      expect(fired, `listener for "${mtype}" did not fire`).toBe(true);
+      expect(received).not.toBeNull();
+    });
+  }
+
+  it("WsEventType union covers every fixture (compile check)", () => {
+    // If a fixture's wire type is missing from WsEventType, the next
+    // line fails to compile. This is the autocomplete guarantee.
+    const _typed: import("../src/types.js").WsEventType[] = [
+      "chat.joined",
+      "chat.left",
+      "chat.message",
+      "dm.message",
+      "dm.sent",
+      "error",
+      "match.finished",
+      "match.joined",
+      "match.left",
+      "match.matched",
+      "match.matchmaker_expired",
+      "match.matchmaker_failed",
+      "match.state",
+      "match.vote_result",
+      "match.vote_start",
+      "match.vote_tally",
+      "match.vote_vetoed",
+      "matchmaker.queued",
+      "matchmaker.removed",
+      "notification.new",
+      "presence.updated",
+      "session.connected",
+      "session.heartbeat",
+      "vote.cast_ok",
+      "vote.veto_ok",
+      "world.finished",
+      "world.joined",
+      "world.left",
+      "world.list",
+      "world.phase_changed",
+      "world.terrain",
+      "world.tick",
+    ];
+    expect(_typed.length).toBe(EXPECTED.size);
+  });
+});
diff --git a/test/fixtures/chat.joined.json b/test/fixtures/chat.joined.json
new file mode 100644
index 0000000..b3a1f77
--- /dev/null
+++ b/test/fixtures/chat.joined.json
@@ -0,0 +1 @@
+{"type":"chat.joined","cid":"7","payload":{"channel_id":"01j8x000000000000000000005"}}
diff --git a/test/fixtures/chat.left.json b/test/fixtures/chat.left.json
new file mode 100644
index 0000000..ef05147
--- /dev/null
+++ b/test/fixtures/chat.left.json
@@ -0,0 +1 @@
+{"type":"chat.left","cid":"8","payload":{"channel_id":"01j8x000000000000000000005"}}
diff --git a/test/fixtures/chat.message.json b/test/fixtures/chat.message.json
new file mode 100644
index 0000000..edb07b5
--- /dev/null
+++ b/test/fixtures/chat.message.json
@@ -0,0 +1 @@
+{"type":"chat.message","payload":{"channel_id":"01j8x000000000000000000005","sender_id":"01j8x000000000000000000000","content":"hello","ts":1730000000000}}
diff --git a/test/fixtures/dm.message.json b/test/fixtures/dm.message.json
new file mode 100644
index 0000000..7217128
--- /dev/null
+++ b/test/fixtures/dm.message.json
@@ -0,0 +1 @@
+{"type":"dm.message","payload":{"sender_id":"01j8x000000000000000000002","content":"hi","ts":1730000000000}}
diff --git a/test/fixtures/dm.sent.json b/test/fixtures/dm.sent.json
new file mode 100644
index 0000000..84071d2
--- /dev/null
+++ b/test/fixtures/dm.sent.json
@@ -0,0 +1 @@
+{"type":"dm.sent","cid":"9","payload":{"recipient_id":"01j8x000000000000000000002","ts":1730000000000}}
diff --git a/test/fixtures/error.json b/test/fixtures/error.json
new file mode 100644
index 0000000..aa8b5cf
--- /dev/null
+++ b/test/fixtures/error.json
@@ -0,0 +1 @@
+{"type":"error","payload":{"reason":"invalid_message"}}
diff --git a/test/fixtures/match.finished.json b/test/fixtures/match.finished.json
new file mode 100644
index 0000000..15ad8dd
--- /dev/null
+++ b/test/fixtures/match.finished.json
@@ -0,0 +1 @@
+{"type":"match.finished","payload":{"match_id":"01j8x000000000000000000001","result":{"winner":"01j8x000000000000000000000"}}}
diff --git a/test/fixtures/match.joined.json b/test/fixtures/match.joined.json
new file mode 100644
index 0000000..a9b7755
--- /dev/null
+++ b/test/fixtures/match.joined.json
@@ -0,0 +1 @@
+{"type":"match.joined","cid":"3","payload":{"match_id":"01j8x000000000000000000001","mode":"demo","players":["01j8x000000000000000000000"]}}
diff --git a/test/fixtures/match.left.json b/test/fixtures/match.left.json
new file mode 100644
index 0000000..9466845
--- /dev/null
+++ b/test/fixtures/match.left.json
@@ -0,0 +1 @@
+{"type":"match.left","cid":"4","payload":{"success":true}}
diff --git a/test/fixtures/match.matched.json b/test/fixtures/match.matched.json
new file mode 100644
index 0000000..6750684
--- /dev/null
+++ b/test/fixtures/match.matched.json
@@ -0,0 +1 @@
+{"type":"match.matched","payload":{"match_id":"01j8x000000000000000000001","mode":"demo","players":["01j8x000000000000000000000","01j8x000000000000000000002"]}}
diff --git a/test/fixtures/match.matchmaker_expired.json b/test/fixtures/match.matchmaker_expired.json
new file mode 100644
index 0000000..4e25f23
--- /dev/null
+++ b/test/fixtures/match.matchmaker_expired.json
@@ -0,0 +1 @@
+{"type":"match.matchmaker_expired","payload":{"ticket_id":"01j8x000000000000000000003"}}
diff --git a/test/fixtures/match.matchmaker_failed.json b/test/fixtures/match.matchmaker_failed.json
new file mode 100644
index 0000000..4ba71c7
--- /dev/null
+++ b/test/fixtures/match.matchmaker_failed.json
@@ -0,0 +1 @@
+{"type":"match.matchmaker_failed","payload":{"reason":"no_game_module"}}
diff --git a/test/fixtures/match.state.json b/test/fixtures/match.state.json
new file mode 100644
index 0000000..b7fd103
--- /dev/null
+++ b/test/fixtures/match.state.json
@@ -0,0 +1 @@
+{"type":"match.state","payload":{"tick":7,"players":{"01j8x000000000000000000000":{"x":120,"y":80}}}}
diff --git a/test/fixtures/match.vote_result.json b/test/fixtures/match.vote_result.json
new file mode 100644
index 0000000..11281a6
--- /dev/null
+++ b/test/fixtures/match.vote_result.json
@@ -0,0 +1 @@
+{"type":"match.vote_result","payload":{"vote_id":"01j8x000000000000000000004","winner":"a"}}
diff --git a/test/fixtures/match.vote_start.json b/test/fixtures/match.vote_start.json
new file mode 100644
index 0000000..869bb72
--- /dev/null
+++ b/test/fixtures/match.vote_start.json
@@ -0,0 +1 @@
+{"type":"match.vote_start","payload":{"vote_id":"01j8x000000000000000000004","template":"map_pick","options":[{"id":"a","label":"Arena"}]}}
diff --git a/test/fixtures/match.vote_tally.json b/test/fixtures/match.vote_tally.json
new file mode 100644
index 0000000..a7c5be7
--- /dev/null
+++ b/test/fixtures/match.vote_tally.json
@@ -0,0 +1 @@
+{"type":"match.vote_tally","payload":{"vote_id":"01j8x000000000000000000004","tally":{"a":1}}}
diff --git a/test/fixtures/match.vote_vetoed.json b/test/fixtures/match.vote_vetoed.json
new file mode 100644
index 0000000..f7806ff
--- /dev/null
+++ b/test/fixtures/match.vote_vetoed.json
@@ -0,0 +1 @@
+{"type":"match.vote_vetoed","payload":{"vote_id":"01j8x000000000000000000004"}}
diff --git a/test/fixtures/matchmaker.queued.json b/test/fixtures/matchmaker.queued.json
new file mode 100644
index 0000000..a96541c
--- /dev/null
+++ b/test/fixtures/matchmaker.queued.json
@@ -0,0 +1 @@
+{"type":"matchmaker.queued","cid":"5","payload":{"ticket_id":"01j8x000000000000000000003","status":"pending"}}
diff --git a/test/fixtures/matchmaker.removed.json b/test/fixtures/matchmaker.removed.json
new file mode 100644
index 0000000..49f9d93
--- /dev/null
+++ b/test/fixtures/matchmaker.removed.json
@@ -0,0 +1 @@
+{"type":"matchmaker.removed","cid":"6","payload":{"success":true}}
diff --git a/test/fixtures/notification.new.json b/test/fixtures/notification.new.json
new file mode 100644
index 0000000..61b2231
--- /dev/null
+++ b/test/fixtures/notification.new.json
@@ -0,0 +1 @@
+{"type":"notification.new","payload":{"id":"01j8x000000000000000000006","kind":"friend_request","from":"01j8x000000000000000000002"}}
diff --git a/test/fixtures/presence.updated.json b/test/fixtures/presence.updated.json
new file mode 100644
index 0000000..7dc9050
--- /dev/null
+++ b/test/fixtures/presence.updated.json
@@ -0,0 +1 @@
+{"type":"presence.updated","cid":"10","payload":{"status":"online"}}
diff --git a/test/fixtures/session.connected.json b/test/fixtures/session.connected.json
new file mode 100644
index 0000000..be8aa9c
--- /dev/null
+++ b/test/fixtures/session.connected.json
@@ -0,0 +1 @@
+{"type":"session.connected","cid":"1","payload":{"player_id":"01j8x000000000000000000000"}}
diff --git a/test/fixtures/session.heartbeat.json b/test/fixtures/session.heartbeat.json
new file mode 100644
index 0000000..b82222d
--- /dev/null
+++ b/test/fixtures/session.heartbeat.json
@@ -0,0 +1 @@
+{"type":"session.heartbeat","cid":"2","payload":{"ts":1730000000000}}
diff --git a/test/fixtures/vote.cast_ok.json b/test/fixtures/vote.cast_ok.json
new file mode 100644
index 0000000..60fb68a
--- /dev/null
+++ b/test/fixtures/vote.cast_ok.json
@@ -0,0 +1 @@
+{"type":"vote.cast_ok","cid":"11","payload":{"success":true}}
diff --git a/test/fixtures/vote.veto_ok.json b/test/fixtures/vote.veto_ok.json
new file mode 100644
index 0000000..4321de6
--- /dev/null
+++ b/test/fixtures/vote.veto_ok.json
@@ -0,0 +1 @@
+{"type":"vote.veto_ok","cid":"12","payload":{"success":true}}
diff --git a/test/fixtures/world.finished.json b/test/fixtures/world.finished.json
new file mode 100644
index 0000000..5458593
--- /dev/null
+++ b/test/fixtures/world.finished.json
@@ -0,0 +1 @@
+{"type":"world.finished","payload":{"world_id":"01j8x000000000000000000007","result":{"winner":"01j8x000000000000000000000"}}}
diff --git a/test/fixtures/world.joined.json b/test/fixtures/world.joined.json
new file mode 100644
index 0000000..7017bf4
--- /dev/null
+++ b/test/fixtures/world.joined.json
@@ -0,0 +1 @@
+{"type":"world.joined","cid":"14","payload":{"world_id":"01j8x000000000000000000007","mode":"village"}}
diff --git a/test/fixtures/world.left.json b/test/fixtures/world.left.json
new file mode 100644
index 0000000..e717961
--- /dev/null
+++ b/test/fixtures/world.left.json
@@ -0,0 +1 @@
+{"type":"world.left","cid":"15","payload":{"success":true}}
diff --git a/test/fixtures/world.list.json b/test/fixtures/world.list.json
new file mode 100644
index 0000000..f064e87
--- /dev/null
+++ b/test/fixtures/world.list.json
@@ -0,0 +1 @@
+{"type":"world.list","cid":"13","payload":{"worlds":[{"id":"01j8x000000000000000000007","mode":"village","capacity":16,"size":3}]}}
diff --git a/test/fixtures/world.phase_changed.json b/test/fixtures/world.phase_changed.json
new file mode 100644
index 0000000..4e7b738
--- /dev/null
+++ b/test/fixtures/world.phase_changed.json
@@ -0,0 +1 @@
+{"type":"world.phase_changed","payload":{"phase":"event","started_at":1730000000000}}
diff --git a/test/fixtures/world.terrain.json b/test/fixtures/world.terrain.json
new file mode 100644
index 0000000..1903a91
--- /dev/null
+++ b/test/fixtures/world.terrain.json
@@ -0,0 +1 @@
+{"type":"world.terrain","payload":{"coords":[0,0],"data":""}}
diff --git a/test/fixtures/world.tick.json b/test/fixtures/world.tick.json
new file mode 100644
index 0000000..3778eca
--- /dev/null
+++ b/test/fixtures/world.tick.json
@@ -0,0 +1 @@
+{"type":"world.tick","payload":{"tick":42,"updates":[{"id":"01j8x000000000000000000000","op":"a","x":120,"y":80}]}}
diff --git a/tsconfig.test.json b/tsconfig.test.json
new file mode 100644
index 0000000..ed734c2
--- /dev/null
+++ b/tsconfig.test.json
@@ -0,0 +1,9 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "rootDir": ".",
+    "noEmit": true,
+    "types": ["node"]
+  },
+  "include": ["src", "test", "smoke_tests"]
+}