diff --git a/extensions/msteams/src/send.test.ts b/extensions/msteams/src/send.test.ts
index a4e5e1c6f06..fb2084b53aa 100644
--- a/extensions/msteams/src/send.test.ts
+++ b/extensions/msteams/src/send.test.ts
@@ -181,6 +181,26 @@ function mockSharePointPdfUpload(params: {
   });
 }
 
+type MockWithCalls = {
+  mock: { calls: unknown[][] };
+};
+
+function firstObjectArg(mock: MockWithCalls): Record<string, unknown> {
+  const value = mock.mock.calls[0]?.[0];
+  if (value === undefined || value === null || typeof value !== "object" || Array.isArray(value)) {
+    throw new Error("expected first mock call to receive an object argument");
+  }
+  return value as Record<string, unknown>;
+}
+
+function continueConversationRef(mock: MockWithCalls): Record<string, unknown> {
+  const ref = mock.mock.calls[0]?.[1];
+  if (ref === undefined || ref === null || typeof ref !== "object" || Array.isArray(ref)) {
+    throw new Error("expected continueConversation ref object");
+  }
+  return ref as Record<string, unknown>;
+}
+
 describe("sendMessageMSTeams", () => {
   beforeEach(() => {
     mockState.loadOutboundMediaFromUrl.mockReset();
@@ -244,21 +264,16 @@ describe("sendMessageMSTeams", () => {
       },
     );
 
-    expect(mockState.sendMSTeamsMessages).toHaveBeenCalledWith(
-      expect.objectContaining({
-        messages: [
-          expect.objectContaining({
-            text: "hello",
-            mediaUrl: `data:image/png;base64,${mediaBuffer.toString("base64")}`,
-          }),
-        ],
-      }),
-    );
-    expect(result.receipt).toMatchObject({
-      primaryPlatformMessageId: "message-1",
-      platformMessageIds: ["message-1"],
-      parts: [expect.objectContaining({ platformMessageId: "message-1", kind: "media" })],
-    });
+    const sendPayload = firstObjectArg(mockState.sendMSTeamsMessages);
+    const messages = sendPayload.messages as Array<Record<string, unknown>>;
+    expect(messages).toHaveLength(1);
+    expect(messages[0]?.text).toBe("hello");
+    expect(messages[0]?.mediaUrl).toBe(`data:image/png;base64,${mediaBuffer.toString("base64")}`);
+    expect(result.receipt?.primaryPlatformMessageId).toBe("message-1");
+    expect(result.receipt?.platformMessageIds).toEqual(["message-1"]);
+    expect(result.receipt?.parts).toHaveLength(1);
+    expect(result.receipt?.parts[0]?.platformMessageId).toBe("message-1");
+    expect(result.receipt?.parts[0]?.kind).toBe("media");
   });
 
   it("sends with provided cfg even when Teams runtime text helpers are unavailable", async () => {
@@ -277,15 +292,13 @@ describe("sendMessageMSTeams", () => {
       text: "hello",
     });
 
-    expect(result).toMatchObject({
-      messageId: "message-1",
-      conversationId: "19:conversation@thread.tacv2",
-      receipt: {
-        primaryPlatformMessageId: "message-1",
-        platformMessageIds: ["message-1"],
-        parts: [expect.objectContaining({ platformMessageId: "message-1", kind: "text" })],
-      },
-    });
+    expect(result.messageId).toBe("message-1");
+    expect(result.conversationId).toBe("19:conversation@thread.tacv2");
+    expect(result.receipt?.primaryPlatformMessageId).toBe("message-1");
+    expect(result.receipt?.platformMessageIds).toEqual(["message-1"]);
+    expect(result.receipt?.parts).toHaveLength(1);
+    expect(result.receipt?.parts[0]?.platformMessageId).toBe("message-1");
+    expect(result.receipt?.parts[0]?.kind).toBe("text");
 
     expect(mockState.resolveMarkdownTableMode).toHaveBeenCalledWith({
       cfg: {},
@@ -317,9 +330,7 @@ describe("sendMessageMSTeams", () => {
       text: "threaded reply",
     });
 
-    expect(mockState.sendMSTeamsMessages).toHaveBeenCalledWith(
-      expect.objectContaining({ replyStyle: "thread" }),
-    );
+    expect(firstObjectArg(mockState.sendMSTeamsMessages).replyStyle).toBe("thread");
   });
 
   it("keeps top-level proactive replyStyle when resolved for a channel", async () => {
@@ -345,9 +356,7 @@ describe("sendMessageMSTeams", () => {
       text: "top-level reply",
     });
 
-    expect(mockState.sendMSTeamsMessages).toHaveBeenCalledWith(
-      expect.objectContaining({ replyStyle: "top-level" }),
-    );
+    expect(firstObjectArg(mockState.sendMSTeamsMessages).replyStyle).toBe("top-level");
   });
 
   it("uses graphChatId instead of conversationId when uploading to SharePoint", async () => {
@@ -378,12 +387,9 @@ describe("sendMessageMSTeams", () => {
     });
 
     // The Graph-native chatId must be passed to SharePoint upload, not the Bot Framework ID
-    expect(mockState.uploadAndShareSharePoint).toHaveBeenCalledWith(
-      expect.objectContaining({
-        chatId: graphChatId,
-        siteId: "site-123",
-      }),
-    );
+    const uploadPayload = firstObjectArg(mockState.uploadAndShareSharePoint);
+    expect(uploadPayload.chatId).toBe(graphChatId);
+    expect(uploadPayload.siteId).toBe("site-123");
   });
 
   it("falls back to conversationId when graphChatId is not available", async () => {
@@ -411,12 +417,9 @@ describe("sendMessageMSTeams", () => {
     });
 
     // Falls back to conversationId when graphChatId is null
-    expect(mockState.uploadAndShareSharePoint).toHaveBeenCalledWith(
-      expect.objectContaining({
-        chatId: botFrameworkConversationId,
-        siteId: "site-456",
-      }),
-    );
+    const uploadPayload = firstObjectArg(mockState.uploadAndShareSharePoint);
+    expect(uploadPayload.chatId).toBe(botFrameworkConversationId);
+    expect(uploadPayload.siteId).toBe("site-456");
   });
 });
 
@@ -477,9 +480,7 @@ describe("editMessageMSTeams", () => {
     expect(mockContinueConversation).toHaveBeenCalledTimes(1);
     const continueConversationCall = mockContinueConversation.mock.calls[0];
     expect(continueConversationCall?.[0]).toBe("app-id");
-    expect(continueConversationCall?.[1]).toEqual(
-      expect.objectContaining({ activityId: undefined }),
-    );
+    expect(continueConversationRef(mockContinueConversation).activityId).toBeUndefined();
     expect(typeof continueConversationCall?.[2]).toBe("function");
     expect(mockUpdateActivity).toHaveBeenCalledWith({
       type: "message",
@@ -530,9 +531,7 @@ describe("deleteMessageMSTeams", () => {
     expect(mockContinueConversation).toHaveBeenCalledTimes(1);
     const continueConversationCall = mockContinueConversation.mock.calls[0];
     expect(continueConversationCall?.[0]).toBe("app-id");
-    expect(continueConversationCall?.[1]).toEqual(
-      expect.objectContaining({ activityId: undefined }),
-    );
+    expect(continueConversationRef(mockContinueConversation).activityId).toBeUndefined();
     expect(typeof continueConversationCall?.[2]).toBe("function");
     expect(mockDeleteActivity).toHaveBeenCalledWith("activity-456");
   });
@@ -572,8 +571,6 @@ describe("deleteMessageMSTeams", () => {
     // appId should be forwarded correctly
     expect(mockContinueConversation.mock.calls[0]?.[0]).toBe("my-app-id");
     // activityId on the proactive ref should be cleared (undefined) — proactive pattern
-    expect(mockContinueConversation.mock.calls[0]?.[1]).toMatchObject({
-      activityId: undefined,
-    });
+    expect(continueConversationRef(mockContinueConversation).activityId).toBeUndefined();
   });
 });