diff --git a/src/gateway/server-methods/chat.abort-persistence.test.ts b/src/gateway/server-methods/chat.abort-persistence.test.ts
index 715f629c734..896e0f472b1 100644
--- a/src/gateway/server-methods/chat.abort-persistence.test.ts
+++ b/src/gateway/server-methods/chat.abort-persistence.test.ts
@@ -279,9 +279,6 @@ describe("chat abort transcript persistence", () => {
       chatDeltaSentAt: new Map([["run-stop-1", Date.now()]]),
       removeChatRun: vi.fn().mockReturnValue({ sessionKey: "main", clientRunId: "client-stop-1" }),
       agentRunSeq: new Map<string, number>([["run-stop-1", 1]]),
-      dedupe: {
-        get: vi.fn(),
-      },
     });
 
     await chatHandlers["chat.send"]({
@@ -321,9 +318,6 @@ describe("chat abort transcript persistence", () => {
         sessionKey: "main",
         clientRunId: "run-stop-canonical",
       }),
-      dedupe: {
-        get: vi.fn(),
-      },
     });
 
     await chatHandlers["chat.send"]({
@@ -356,9 +350,6 @@ describe("chat abort transcript persistence", () => {
         sessionKey: "alias-main",
         clientRunId: "run-stop-raw-alias",
       }),
-      dedupe: {
-        get: vi.fn(),
-      },
     });
 
     await chatHandlers["chat.send"]({
@@ -387,9 +378,6 @@ describe("chat abort transcript persistence", () => {
     const active = createActiveRun("third-session", { sessionId });
     const context = createChatAbortContext({
       chatAbortControllers: new Map([["run-stop-client-session", active]]),
-      dedupe: {
-        get: vi.fn(),
-      },
     });
 
     await chatHandlers["chat.send"]({
diff --git a/src/gateway/server-methods/chat.abort.test-helpers.ts b/src/gateway/server-methods/chat.abort.test-helpers.ts
index c2c5a1860cb..af8ddec9e73 100644
--- a/src/gateway/server-methods/chat.abort.test-helpers.ts
+++ b/src/gateway/server-methods/chat.abort.test-helpers.ts
@@ -27,6 +27,7 @@ type ChatAbortTestContext = Record<string, unknown> & {
   chatDeltaSentAt: Map<string, number>;
   chatDeltaLastBroadcastLen: Map<string, number>;
   chatDeltaLastBroadcastText: Map<string, string>;
+  dedupe: Map<string, unknown>;
   agentDeltaSentAt: Map<string, number>;
   bufferedAgentEvents: Map<string, unknown>;
   chatAbortedRuns: Map<string, number>;
@@ -48,6 +49,7 @@ export function createChatAbortContext(
     chatDeltaSentAt: new Map(),
     chatDeltaLastBroadcastLen: new Map(),
     chatDeltaLastBroadcastText: new Map(),
+    dedupe: new Map(),
     agentDeltaSentAt: new Map(),
     bufferedAgentEvents: new Map(),
     chatAbortedRuns: new Map<string, number>(),