diff --git a/Cargo.lock b/Cargo.lock
index d8f71770..2f0e5b21 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2590,6 +2590,7 @@ name = "opendut-carl"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "assert_fs",
  "async-trait",
  "axum",
  "axum-server",
diff --git a/opendut-carl/Cargo.toml b/opendut-carl/Cargo.toml
index 271c296f..1302d3b0 100644
--- a/opendut-carl/Cargo.toml
+++ b/opendut-carl/Cargo.toml
@@ -44,6 +44,7 @@ url = { workspace = true, features = ["serde"] }
 uuid = { workspace = true }
 
 [dev-dependencies]
+assert_fs = { workspace = true }
 async-trait = { workspace = true }
 rstest = { workspace = true }
 uuid = { workspace = true, features = ["v4"] }
diff --git a/opendut-carl/src/lib.rs b/opendut-carl/src/lib.rs
index b85a7e7c..2c06b4d5 100644
--- a/opendut-carl/src/lib.rs
+++ b/opendut-carl/src/lib.rs
@@ -459,3 +459,36 @@ impl CleoArch {
         CLEO_ARCH.iter()
     }
 }
+
+#[cfg(test)]
+mod test {
+    use assert_fs::fixture::{FileTouch, PathChild};
+    use assert_fs::TempDir;
+    use axum::extract::Path;
+    use axum::response::IntoResponse;
+    use googletest::assert_that;
+    use googletest::matchers::eq;
+    use http::header;
+    use tracing::warn;
+    use crate::{CleoArch, download_cleo};
+
+    #[tokio::test()]
+    async fn download_cleo_development_succeeds() -> anyhow::Result<()> {
+        let temp = TempDir::new().unwrap();
+
+        let dir = temp.child("target/debug/opendut-cleo");
+        dir.touch().unwrap();
+
+        std::env::set_current_dir(&temp).unwrap_or_else(|_| warn!("Could not set back current directory to {}", temp.display()));
+
+        let cleo = download_cleo(Path(CleoArch::Development)).await;
+        let response = cleo.into_response();
+        let header = response.headers().get(header::CONTENT_DISPOSITION).unwrap();
+        let expected_header = format!("attachment; filename=\"{}\"", CleoArch::Development.file_name());
+        assert_that!(header.clone().to_str().unwrap(), eq(expected_header.as_str()));
+
+        Ok(())
+    }
+
+}
+