diff --git a/extensions/mattermost/src/mattermost/client.test.ts b/extensions/mattermost/src/mattermost/client.test.ts
index 3d325dda527..7d49ad3c573 100644
--- a/extensions/mattermost/src/mattermost/client.test.ts
+++ b/extensions/mattermost/src/mattermost/client.test.ts
@@ -27,6 +27,28 @@ function createMockFetch(response?: { status?: number; body?: unknown; contentTy
   return { mockFetch: mockFetch as unknown as typeof fetch, calls };
 }
 
+function createTestClient(response?: { status?: number; body?: unknown; contentType?: string }) {
+  const { mockFetch, calls } = createMockFetch(response);
+  const client = createMattermostClient({
+    baseUrl: "http://localhost:8065",
+    botToken: "tok",
+    fetchImpl: mockFetch,
+  });
+  return { client, calls };
+}
+
+async function updatePostAndCapture(
+  update: Parameters<typeof updateMattermostPost>[2],
+  response?: { status?: number; body?: unknown; contentType?: string },
+) {
+  const { client, calls } = createTestClient(response ?? { body: { id: "post1" } });
+  await updateMattermostPost(client, "post1", update);
+  return {
+    calls,
+    body: JSON.parse(calls[0].init?.body as string) as Record<string, unknown>,
+  };
+}
+
 // ── normalizeMattermostBaseUrl ────────────────────────────────────────
 
 describe("normalizeMattermostBaseUrl", () => {
@@ -229,68 +251,38 @@ describe("createMattermostPost", () => {
 
 describe("updateMattermostPost", () => {
   it("sends PUT to /posts/{id}", async () => {
-    const { mockFetch, calls } = createMockFetch({ body: { id: "post1" } });
-    const client = createMattermostClient({
-      baseUrl: "http://localhost:8065",
-      botToken: "tok",
-      fetchImpl: mockFetch,
-    });
-
-    await updateMattermostPost(client, "post1", { message: "Updated" });
+    const { calls } = await updatePostAndCapture({ message: "Updated" });
 
     expect(calls[0].url).toContain("/posts/post1");
     expect(calls[0].init?.method).toBe("PUT");
   });
 
   it("includes post id in the body", async () => {
-    const { mockFetch, calls } = createMockFetch({ body: { id: "post1" } });
-    const client = createMattermostClient({
-      baseUrl: "http://localhost:8065",
-      botToken: "tok",
-      fetchImpl: mockFetch,
-    });
-
-    await updateMattermostPost(client, "post1", { message: "Updated" });
-
-    const body = JSON.parse(calls[0].init?.body as string);
+    const { body } = await updatePostAndCapture({ message: "Updated" });
     expect(body.id).toBe("post1");
     expect(body.message).toBe("Updated");
   });
 
   it("includes props for button completion updates", async () => {
-    const { mockFetch, calls } = createMockFetch({ body: { id: "post1" } });
-    const client = createMattermostClient({
-      baseUrl: "http://localhost:8065",
-      botToken: "tok",
-      fetchImpl: mockFetch,
-    });
-
-    await updateMattermostPost(client, "post1", {
+    const { body } = await updatePostAndCapture({
       message: "Original message",
       props: {
         attachments: [{ text: "✓ **do_now** selected by @tony" }],
       },
     });
-
-    const body = JSON.parse(calls[0].init?.body as string);
     expect(body.message).toBe("Original message");
-    expect(body.props.attachments[0].text).toContain("✓");
-    expect(body.props.attachments[0].text).toContain("do_now");
+    expect(body.props).toMatchObject({
+      attachments: [{ text: expect.stringContaining("✓") }],
+    });
+    expect(body.props).toMatchObject({
+      attachments: [{ text: expect.stringContaining("do_now") }],
+    });
   });
 
   it("omits message when not provided", async () => {
-    const { mockFetch, calls } = createMockFetch({ body: { id: "post1" } });
-    const client = createMattermostClient({
-      baseUrl: "http://localhost:8065",
-      botToken: "tok",
-      fetchImpl: mockFetch,
-    });
-
-    await updateMattermostPost(client, "post1", {
+    const { body } = await updatePostAndCapture({
       props: { attachments: [] },
     });
-
-    const body = JSON.parse(calls[0].init?.body as string);
     expect(body.id).toBe("post1");
     expect(body.message).toBeUndefined();
     expect(body.props).toEqual({ attachments: [] });
diff --git a/extensions/tlon/src/urbit/upload.test.ts b/extensions/tlon/src/urbit/upload.test.ts
index 1a573a6b359..34dd6186d20 100644
--- a/extensions/tlon/src/urbit/upload.test.ts
+++ b/extensions/tlon/src/urbit/upload.test.ts
@@ -45,6 +45,27 @@ describe("uploadImageFromUrl", () => {
     });
   }
 
+  async function setupSuccessfulUpload(params?: {
+    sourceUrl?: string;
+    contentType?: string;
+    uploadedUrl?: string;
+  }) {
+    const { mockFetch, mockUploadFile, uploadImageFromUrl } = await loadUploadMocks();
+    const sourceUrl = params?.sourceUrl ?? "https://example.com/image.png";
+    const contentType = params?.contentType ?? "image/png";
+    const mockBlob = new Blob(["fake-image"], { type: contentType });
+    mockSuccessfulFetch({
+      mockFetch,
+      blob: mockBlob,
+      finalUrl: sourceUrl,
+      contentType,
+    });
+    if (params?.uploadedUrl) {
+      mockUploadFile.mockResolvedValue({ url: params.uploadedUrl });
+    }
+    return { mockBlob, mockUploadFile, uploadImageFromUrl };
+  }
+
   beforeEach(() => {
     vi.clearAllMocks();
   });
@@ -54,16 +75,9 @@ describe("uploadImageFromUrl", () => {
   });
 
   it("fetches image and calls uploadFile, returns uploaded URL", async () => {
-    const { mockFetch, mockUploadFile, uploadImageFromUrl } = await loadUploadMocks();
-
-    const mockBlob = new Blob(["fake-image"], { type: "image/png" });
-    mockSuccessfulFetch({
-      mockFetch,
-      blob: mockBlob,
-      finalUrl: "https://example.com/image.png",
-      contentType: "image/png",
+    const { mockBlob, mockUploadFile, uploadImageFromUrl } = await setupSuccessfulUpload({
+      uploadedUrl: "https://memex.tlon.network/uploaded.png",
     });
-    mockUploadFile.mockResolvedValue({ url: "https://memex.tlon.network/uploaded.png" });
 
     const result = await uploadImageFromUrl("https://example.com/image.png");
 
@@ -95,15 +109,7 @@ describe("uploadImageFromUrl", () => {
   });
 
   it("returns original URL if upload fails", async () => {
-    const { mockFetch, mockUploadFile, uploadImageFromUrl } = await loadUploadMocks();
-
-    const mockBlob = new Blob(["fake-image"], { type: "image/png" });
-    mockSuccessfulFetch({
-      mockFetch,
-      blob: mockBlob,
-      finalUrl: "https://example.com/image.png",
-      contentType: "image/png",
-    });
+    const { mockUploadFile, uploadImageFromUrl } = await setupSuccessfulUpload();
     mockUploadFile.mockRejectedValue(new Error("Upload failed"));
 
     const result = await uploadImageFromUrl("https://example.com/image.png");
diff --git a/extensions/voice-call/src/providers/twilio.test.ts b/extensions/voice-call/src/providers/twilio.test.ts
index 0a88bdeae07..9f3172ef16e 100644
--- a/extensions/voice-call/src/providers/twilio.test.ts
+++ b/extensions/voice-call/src/providers/twilio.test.ts
@@ -21,6 +21,12 @@ function createContext(rawBody: string, query?: WebhookContext["query"]): Webhoo
   };
 }
 
+function expectStreamingTwiml(body: string) {
+  expect(body).toContain(STREAM_URL);
+  expect(body).toContain('<Parameter name="token" value="');
+  expect(body).toContain("<Connect>");
+}
+
 describe("TwilioProvider", () => {
   it("returns streaming TwiML for outbound conversation calls before in-progress", () => {
     const provider = createProvider();
@@ -30,9 +36,7 @@ describe("TwilioProvider", () => {
 
     const result = provider.parseWebhookEvent(ctx);
 
-    expect(result.providerResponseBody).toContain(STREAM_URL);
-    expect(result.providerResponseBody).toContain('<Parameter name="token" value="');
-    expect(result.providerResponseBody).toContain("<Connect>");
+    expectStreamingTwiml(result.providerResponseBody);
   });
 
   it("returns empty TwiML for status callbacks", () => {
@@ -55,9 +59,7 @@ describe("TwilioProvider", () => {
 
     const result = provider.parseWebhookEvent(ctx);
 
-    expect(result.providerResponseBody).toContain(STREAM_URL);
-    expect(result.providerResponseBody).toContain('<Parameter name="token" value="');
-    expect(result.providerResponseBody).toContain("<Connect>");
+    expectStreamingTwiml(result.providerResponseBody);
   });
 
   it("returns queue TwiML for second inbound call when first call is active", () => {