diff --git a/packages/dsv/test/types.ts b/packages/dsv/test/types.ts
index f48fb7319..a632ed3ca 100644
--- a/packages/dsv/test/types.ts
+++ b/packages/dsv/test/types.ts
@@ -2,6 +2,8 @@ import type { RollupOptions } from 'rollup';
 
 import dsv from '..';
 
+const parse = (value: string) => (isNaN(+value) ? value : +value);
+
 const config: RollupOptions = {
   input: 'main.js',
   output: {
@@ -13,7 +15,12 @@ const config: RollupOptions = {
       include: 'node_modules/**',
       exclude: ['node_modules/foo/**', 'node_modules/bar/**'],
       processRow(row) {
-        return row;
+        return Object.entries(row).map(([key, value]) => [key, parse(value)]);
+      }
+    }),
+    dsv({
+      processRow() {
+        // void
       }
     })
   ]