diff --git a/extensions/anthropic/index.test.ts b/extensions/anthropic/index.test.ts
index 9c24443e32f..c88165fb918 100644
--- a/extensions/anthropic/index.test.ts
+++ b/extensions/anthropic/index.test.ts
@@ -48,8 +48,9 @@ function createModelRegistry(models: ProviderRuntimeModel[]) {
 }
 
 function requireRecord(value: unknown, label: string): Record<string, unknown> {
-  expect(value, label).toBeTypeOf("object");
-  expect(value, label).not.toBeNull();
+  if (!value || typeof value !== "object") {
+    throw new Error(`expected ${label}`);
+  }
   return value as Record<string, unknown>;
 }
 
diff --git a/extensions/google-meet/index.create.test.ts b/extensions/google-meet/index.create.test.ts
index 0db05c7f624..21df2328152 100644
--- a/extensions/google-meet/index.create.test.ts
+++ b/extensions/google-meet/index.create.test.ts
@@ -100,8 +100,9 @@ async function runCreateMeetBrowserScript(params: { buttonText: string }) {
 }
 
 function requireRecord(value: unknown, label: string): Record<string, unknown> {
-  expect(value, label).toBeTypeOf("object");
-  expect(value, label).not.toBeNull();
+  if (!value || typeof value !== "object") {
+    throw new Error(`expected ${label}`);
+  }
   return value as Record<string, unknown>;
 }
 
diff --git a/extensions/google-meet/src/cli.test.ts b/extensions/google-meet/src/cli.test.ts
index 609af14befc..c0d5327bad3 100644
--- a/extensions/google-meet/src/cli.test.ts
+++ b/extensions/google-meet/src/cli.test.ts
@@ -43,8 +43,9 @@ function captureStdout() {
 }
 
 function expectFields(value: unknown, expected: Record<string, unknown>): void {
-  expect(value).toBeTypeOf("object");
-  expect(value).not.toBeNull();
+  if (!value || typeof value !== "object") {
+    throw new Error("expected fields object");
+  }
   const record = value as Record<string, unknown>;
   for (const [key, expectedValue] of Object.entries(expected)) {
     expect(record[key], key).toEqual(expectedValue);
@@ -54,8 +55,9 @@ function expectFields(value: unknown, expected: Record<string, unknown>): void {
 function firstRecord(value: unknown): Record<string, unknown> {
   expect(Array.isArray(value)).toBe(true);
   const [record] = value as unknown[];
-  expect(record).toBeTypeOf("object");
-  expect(record).not.toBeNull();
+  if (!record || typeof record !== "object") {
+    throw new Error("expected first record");
+  }
   return record as Record<string, unknown>;
 }
 
diff --git a/extensions/litellm/image-generation-provider.test.ts b/extensions/litellm/image-generation-provider.test.ts
index dd3b0e6299e..9d637b0facd 100644
--- a/extensions/litellm/image-generation-provider.test.ts
+++ b/extensions/litellm/image-generation-provider.test.ts
@@ -63,14 +63,16 @@ function mockObjectArg(mock: unknown, index = -1): Record<string, unknown> {
   const calls = (mock as { mock?: { calls?: Array<Array<unknown>> } }).mock?.calls ?? [];
   const call = index < 0 ? calls.at(index) : calls[index];
   const [arg] = call ?? [];
-  expect(arg).toBeTypeOf("object");
-  expect(arg).not.toBeNull();
+  if (!arg || typeof arg !== "object") {
+    throw new Error(`expected mock object argument ${index}`);
+  }
   return arg as Record<string, unknown>;
 }
 
 function expectFields(value: unknown, expected: Record<string, unknown>): void {
-  expect(value).toBeTypeOf("object");
-  expect(value).not.toBeNull();
+  if (!value || typeof value !== "object") {
+    throw new Error("expected fields object");
+  }
   const record = value as Record<string, unknown>;
   for (const [key, expectedValue] of Object.entries(expected)) {
     expect(record[key], key).toEqual(expectedValue);
diff --git a/extensions/memory-wiki/src/markdown.test.ts b/extensions/memory-wiki/src/markdown.test.ts
index b838d8ce346..d75fb4c9789 100644
--- a/extensions/memory-wiki/src/markdown.test.ts
+++ b/extensions/memory-wiki/src/markdown.test.ts
@@ -109,7 +109,6 @@ describe("toWikiPageSummary", () => {
       relativePath: "entities/brad.md",
       raw,
     });
-    expect(summary).not.toBeNull();
     if (!summary) {
       throw new Error("expected wiki summary");
     }
diff --git a/extensions/memory-wiki/src/tool.test.ts b/extensions/memory-wiki/src/tool.test.ts
index b2d1a5c18ab..7eb73d78db6 100644
--- a/extensions/memory-wiki/src/tool.test.ts
+++ b/extensions/memory-wiki/src/tool.test.ts
@@ -3,9 +3,6 @@ import type { ResolvedMemoryWikiConfig } from "./config.js";
 import { createWikiApplyTool } from "./tool.js";
 
 function asSchemaObject(value: unknown): Record<string, unknown> {
-  expect(typeof value).toBe("object");
-  expect(value).not.toBeNull();
-  expect(Array.isArray(value)).toBe(false);
   if (typeof value !== "object" || value === null || Array.isArray(value)) {
     throw new Error("Expected JSON schema object");
   }
diff --git a/extensions/ollama/src/stream-runtime.test.ts b/extensions/ollama/src/stream-runtime.test.ts
index a977ed6a377..c58474bb9e4 100644
--- a/extensions/ollama/src/stream-runtime.test.ts
+++ b/extensions/ollama/src/stream-runtime.test.ts
@@ -29,8 +29,9 @@ type GuardedFetchCall = {
 };
 
 function requireRecord(value: unknown, label: string): Record<string, unknown> {
-  expect(value, label).toBeTypeOf("object");
-  expect(value, label).not.toBeNull();
+  if (!value || typeof value !== "object") {
+    throw new Error(`expected ${label}`);
+  }
   return value as Record<string, unknown>;
 }
 
diff --git a/extensions/openai/media-understanding-provider.test.ts b/extensions/openai/media-understanding-provider.test.ts
index 46993e11706..6b81ca8f0b1 100644
--- a/extensions/openai/media-understanding-provider.test.ts
+++ b/extensions/openai/media-understanding-provider.test.ts
@@ -75,8 +75,10 @@ describe("transcribeOpenAiAudio", () => {
     expect(form.get("language")).toBe("en");
     expect(form.get("prompt")).toBe("hello");
     const file = form.get("file") as Blob | { type?: string; name?: string } | null;
-    expect(file).not.toBeNull();
-    expect(file?.type).toBe("audio/wav");
+    if (!file) {
+      throw new Error("expected OpenAI audio file");
+    }
+    expect(file.type).toBe("audio/wav");
     if (file && "name" in file && typeof file.name === "string") {
       expect(file.name).toBe("voice.wav");
     }
diff --git a/extensions/openai/openai-provider.test.ts b/extensions/openai/openai-provider.test.ts
index 128f45b3c31..569ef572ccf 100644
--- a/extensions/openai/openai-provider.test.ts
+++ b/extensions/openai/openai-provider.test.ts
@@ -93,8 +93,9 @@ function runWrappedPayloadCase(params: {
 }
 
 function expectFields(value: unknown, expected: Record<string, unknown>): void {
-  expect(value).toBeTypeOf("object");
-  expect(value).not.toBeNull();
+  if (!value || typeof value !== "object") {
+    throw new Error("expected fields object");
+  }
   const record = value as Record<string, unknown>;
   for (const [key, expectedValue] of Object.entries(expected)) {
     expect(record[key], key).toEqual(expectedValue);
diff --git a/extensions/openrouter/video-generation-provider.test.ts b/extensions/openrouter/video-generation-provider.test.ts
index d91186a6e3d..534a38def59 100644
--- a/extensions/openrouter/video-generation-provider.test.ts
+++ b/extensions/openrouter/video-generation-provider.test.ts
@@ -94,8 +94,6 @@ function requireFetchCallHeaders(index: number): Headers {
 }
 
 function requireRecord(value: unknown, label: string): Record<string, unknown> {
-  expect(typeof value).toBe("object");
-  expect(value).not.toBeNull();
   if (typeof value !== "object" || value === null) {
     throw new Error(`${label} was not an object`);
   }
diff --git a/extensions/qa-lab/src/cli.runtime.test.ts b/extensions/qa-lab/src/cli.runtime.test.ts
index 0b23aa7e019..6968801bf3a 100644
--- a/extensions/qa-lab/src/cli.runtime.test.ts
+++ b/extensions/qa-lab/src/cli.runtime.test.ts
@@ -87,14 +87,16 @@ import type { QaProviderModeInput } from "./run-config.js";
 function mockFirstObjectArg(mock: unknown): Record<string, unknown> {
   const calls = (mock as { mock?: { calls?: Array<Array<unknown>> } }).mock?.calls ?? [];
   const [arg] = calls[0] ?? [];
-  expect(arg).toBeTypeOf("object");
-  expect(arg).not.toBeNull();
+  if (!arg || typeof arg !== "object") {
+    throw new Error("expected first mock object argument");
+  }
   return arg as Record<string, unknown>;
 }
 
 function expectFields(value: unknown, expected: Record<string, unknown>): void {
-  expect(value).toBeTypeOf("object");
-  expect(value).not.toBeNull();
+  if (!value || typeof value !== "object") {
+    throw new Error("expected fields object");
+  }
   const record = value as Record<string, unknown>;
   for (const [key, expectedValue] of Object.entries(expected)) {
     expect(record[key], key).toEqual(expectedValue);
diff --git a/extensions/senseaudio/media-understanding-provider.test.ts b/extensions/senseaudio/media-understanding-provider.test.ts
index eec79267f16..6cfa195e49c 100644
--- a/extensions/senseaudio/media-understanding-provider.test.ts
+++ b/extensions/senseaudio/media-understanding-provider.test.ts
@@ -78,8 +78,10 @@ describe("transcribeSenseAudioAudio", () => {
     expect(form.get("language")).toBe("en");
     expect(form.get("prompt")).toBe("hello");
     const file = form.get("file") as Blob | { type?: string; name?: string } | null;
-    expect(file).not.toBeNull();
-    expect(file?.type).toBe("audio/wav");
+    if (!file) {
+      throw new Error("expected SenseAudio audio file");
+    }
+    expect(file.type).toBe("audio/wav");
     if (file && "name" in file && typeof file.name === "string") {
       expect(file.name).toBe("voice.wav");
     }