diff --git a/src/util.test.ts b/src/util.test.ts
index 13ae6e0bb..406f2532c 100644
--- a/src/util.test.ts
+++ b/src/util.test.ts
@@ -534,3 +534,12 @@ test("getCgroupCpuCountFromCpus returns undefined if the CPU file exists but is
     );
   });
 });
+
+test("checkDiskUsage succeeds and produces positive numbers", async (t) => {
+  const diskUsage = await util.checkDiskUsage(getRunnerLogger(true));
+  t.true(
+    diskUsage?.numAvailableBytes !== undefined &&
+      diskUsage.numAvailableBytes > 0,
+  );
+  t.true(diskUsage?.numTotalBytes !== undefined && diskUsage.numTotalBytes > 0);
+});