Print failed response body in integration tests

Signed-off-by: Lann Martin <[email protected]>

tests/integration.rs

@@ -639,7 +639,11 @@ mod integration_tests {
         expected: u16,
     ) -> Result<()> {
         let res = req(s, absolute_uri).await?;
-        assert_eq!(res.status(), expected);
+        let status = res.status();
+        let body = hyper::body::to_bytes(res.into_body())
+            .await
+            .expect("read body");
+        assert_eq!(status, expected, "{}", String::from_utf8_lossy(&body));
 
         Ok(())
     }