diff --git a/src/aws/builder.rs b/src/aws/builder.rs
index 3aaad04f..27742716 100644
--- a/src/aws/builder.rs
+++ b/src/aws/builder.rs
@@ -1526,7 +1526,8 @@ mod tests {
             .with_region("region")
             .with_bucket_name("bucket_name")
             .with_allow_http(true)
-            .with_proxy_url("asdf://example.com")
+            // use invalid url
+            .with_proxy_url("dxx:ddd\\example.com")
             .build()
             .unwrap_err()
             .to_string();
diff --git a/src/client/retry.rs b/src/client/retry.rs
index fb098137..b6097d92 100644
--- a/src/client/retry.rs
+++ b/src/client/retry.rs
@@ -622,7 +622,7 @@ mod tests {
         assert_eq!(r.status(), StatusCode::OK);
 
         // Handles redirect loop
-        for _ in 0..10 {
+        for _ in 0..11 {
             mock.push(
                 Response::builder()
                     .status(StatusCode::FOUND)
diff --git a/src/gcp/builder.rs b/src/gcp/builder.rs
index 8d062a2d..87e28d5a 100644
--- a/src/gcp/builder.rs
+++ b/src/gcp/builder.rs
@@ -674,7 +674,8 @@ mod tests {
         let err = GoogleCloudStorageBuilder::new()
             .with_service_account_path(service_account_path.to_str().unwrap())
             .with_bucket_name("foo")
-            .with_proxy_url("asdf://example.com")
+            // use invalid url
+            .with_proxy_url("dxx:ddd\\example.com")
             .build()
             .unwrap_err()
             .to_string();