diff --git a/frontend/src/components/Chat.test.tsx b/frontend/src/components/Chat.test.tsx
index 39208c0..d04c2d0 100644
--- a/frontend/src/components/Chat.test.tsx
+++ b/frontend/src/components/Chat.test.tsx
@@ -625,16 +625,17 @@ describe("Chat localStorage persistence (Story 145)", () => {
 
 		// Verify sendChat was called with ALL prior messages + the new one
 		expect(lastSendChatArgs).not.toBeNull();
-		expect(lastSendChatArgs?.messages).toHaveLength(3);
-		expect(lastSendChatArgs?.messages[0]).toEqual({
+		const args = lastSendChatArgs!;
+		expect(args.messages).toHaveLength(3);
+		expect(args.messages[0]).toEqual({
 			role: "user",
 			content: "What is Rust?",
 		});
-		expect(lastSendChatArgs?.messages[1]).toEqual({
+		expect(args.messages[1]).toEqual({
 			role: "assistant",
 			content: "Rust is a systems programming language.",
 		});
-		expect(lastSendChatArgs?.messages[2]).toEqual({
+		expect(args.messages[2]).toEqual({
 			role: "user",
 			content: "Tell me more",
 		});
@@ -1343,7 +1344,7 @@ describe("Bug 264: Claude Code session ID persisted across browser refresh", ()
 
 		expect(lastSendChatArgs).not.toBeNull();
 		expect(
-			(lastSendChatArgs?.config as Record<string, unknown>).session_id,
+			(lastSendChatArgs!.config as Record<string, unknown>).session_id,
 		).toBe("persisted-session-xyz");
 	});