diff --git a/src/agents/apply-patch.test.ts b/src/agents/apply-patch.test.ts
index 0eb63d8fdb4..363c20aa3f2 100644
--- a/src/agents/apply-patch.test.ts
+++ b/src/agents/apply-patch.test.ts
@@ -84,7 +84,17 @@ async function expectOutsideWriteRejected(params: {
 }) {
   const patch = buildAddFilePatch(params.patchTargetPath);
   await expect(applyPatch(patch, { cwd: params.dir })).rejects.toThrow(/Path escapes sandbox root/);
-  await expect(fs.readFile(params.outsidePath, "utf8")).rejects.toMatchObject({ code: "ENOENT" });
+  await expectMissingPath(fs.readFile(params.outsidePath, "utf8"));
+}
+
+async function expectMissingPath(operation: Promise<unknown>) {
+  let error: NodeJS.ErrnoException | undefined;
+  try {
+    await operation;
+  } catch (caught) {
+    error = caught as NodeJS.ErrnoException;
+  }
+  expect(error?.code).toBe("ENOENT");
 }
 
 describe("applyPatch", () => {
@@ -232,7 +242,7 @@ describe("applyPatch", () => {
         await expect(applyPatch(patch, { cwd: dir })).rejects.toThrow(
           /Symlink escapes sandbox root/,
         );
-        await expect(fs.readFile(outsideFile, "utf8")).rejects.toMatchObject({ code: "ENOENT" });
+        await expectMissingPath(fs.readFile(outsideFile, "utf8"));
       } finally {
         await fs.rm(outsideDir, { recursive: true, force: true });
       }
@@ -376,7 +386,7 @@ describe("applyPatch", () => {
 
         const result = await applyPatch(patch, { cwd: dir });
         expect(result.summary.deleted).toEqual(["link"]);
-        await expect(fs.lstat(linkDir)).rejects.toMatchObject({ code: "ENOENT" });
+        await expectMissingPath(fs.lstat(linkDir));
         const outsideContents = await fs.readFile(outsideTarget, "utf8");
         expect(outsideContents).toBe("keep\n");
       } finally {
@@ -456,9 +466,7 @@ describe("applyPatch", () => {
               );
             },
           });
-          await expect(fs.stat(path.join(outside, "nested"))).rejects.toMatchObject({
-            code: "ENOENT",
-          });
+          await expectMissingPath(fs.stat(path.join(outside, "nested")));
         } finally {
           await fs.rm(outside, { recursive: true, force: true });
         }