Diagnose output

Signed-off-by: Thomas Chetwin <[email protected]>

tests/loader.test.ts

@@ -22,9 +22,16 @@ test("exports correctly working loader hooks", async (t) => {
     });
 
     const result = await new Promise<Error | string>((resolve) => {
-        child.on("exit", (code) => {
+        child.on("error", (err) => {
+            resolve(err);
+        });
+        child.on("exit", async (code) => {
             if (code) {
-                resolve(new Error(`code: ${code}`));
+                resolve(
+                    new Error(
+                        `code: ${code}, stdout: "${await text(child.stdout!)}", stderr: "${await text(child.stderr!)}"`,
+                    ),
+                );
             }
             resolve(text(child.stdout!));
         });