diff --git a/extensions/signal/src/client.test.ts b/extensions/signal/src/client.test.ts
index 48d2dd0ab5d..05c2fe42803 100644
--- a/extensions/signal/src/client.test.ts
+++ b/extensions/signal/src/client.test.ts
@@ -95,14 +95,21 @@ describe("signalRpcRequest", () => {
       res.end("not-json");
     });
 
-    await expect(
-      signalRpcRequest("version", undefined, {
+    let thrown: unknown;
+    try {
+      await signalRpcRequest("version", undefined, {
         baseUrl,
-      }),
-    ).rejects.toMatchObject({
-      message: "Signal RPC returned malformed JSON (status 502)",
-      cause: expect.any(SyntaxError),
-    });
+      });
+    } catch (error) {
+      thrown = error;
+    }
+
+    expect(thrown).toBeInstanceOf(Error);
+    if (!(thrown instanceof Error)) {
+      throw new Error("expected malformed JSON request to throw an Error");
+    }
+    expect(thrown.message).toBe("Signal RPC returned malformed JSON (status 502)");
+    expect(thrown.cause).toBeInstanceOf(SyntaxError);
   });
 
   it("throws when RPC response envelope has neither result nor error", async () => {
diff --git a/extensions/signal/src/message-actions.test.ts b/extensions/signal/src/message-actions.test.ts
index d77ee50de7f..6d71ebf1c93 100644
--- a/extensions/signal/src/message-actions.test.ts
+++ b/extensions/signal/src/message-actions.test.ts
@@ -136,6 +136,12 @@ describe("signalMessageActions", () => {
 
     for (const testCase of cases) {
       sendReactionSignalMock.mockClear();
+      const expectedOptions = testCase.expectedOptions as {
+        accountId?: string;
+        groupId?: string;
+        targetAuthor?: string;
+        targetAuthorUuid?: string;
+      };
       await signalMessageActions.handleAction?.({
         channel: "signal",
         action: "react",
@@ -149,10 +155,13 @@ describe("signalMessageActions", () => {
         testCase.expectedRecipient,
         testCase.expectedTimestamp,
         testCase.expectedEmoji,
-        expect.objectContaining({
+        {
           cfg: testCase.cfg,
-          ...testCase.expectedOptions,
-        }),
+          accountId: expectedOptions.accountId,
+          groupId: expectedOptions.groupId,
+          targetAuthor: expectedOptions.targetAuthor,
+          targetAuthorUuid: expectedOptions.targetAuthorUuid,
+        },
       );
     }
   });