Add test for adaptors losing Requester trait bounds issue

crates/teloxide-core/src/adaptors.rs

@@ -45,3 +45,37 @@ pub use throttle::Throttle;
 pub use trace::Trace;
 
 pub use parse_mode::DefaultParseMode;
+
+#[cfg(all(
+    test,
+    feature = "cache_me",
+    feature = "throttle",
+    feature = "trace_adaptor",
+    feature = "erased"
+))]
+// Tests composition of all possible adaptors. The goal of this test is to 
+// catch situations when wrapped by adaptor bot loses Requester trait bounds.
+// The problem occurs because Throttle adaptor holds queue of requests, thus 
+// introducing requirement for all requests to also implement Clone. 
+mod composition_test {
+    use crate::{requests::RequesterExt, types::ParseMode, Bot};
+    use throttle::Limits;
+    use trace::Settings;
+
+    use super::*;
+
+    // Has to be async test due to Throttle adaptor requirements
+    #[tokio::test]
+    async fn composition() {
+        let bot = Bot::new("TOKEN");
+
+        // Erased adaptor validates Requester trait bounds, so this should fail to 
+        // compile whenever issue occurs.
+        let _ = bot
+            .throttle(Limits::default())
+            .cache_me()
+            .trace(Settings::empty())
+            .parse_mode(ParseMode::MarkdownV2)
+            .erase();
+    }
+}