test: fix imports for fuzz targets

fuzz/fuzz_targets/streams.rs

@@ -31,7 +31,7 @@ enum Operation {
 
 fuzz_target!(|input: (StreamParams, Vec<Operation>)| {
     let (params, operations) = input;
-    let (mut pending, conn_state) = (Retransmits::default(), ConnectionState::Established);
+    let (mut pending, conn_state) = (Retransmits::default(), ConnectionState::established());
     let mut state = StreamsState::new(
         params.side,
         params.max_remote_uni.into(),

quinn-proto/src/connection/mod.rs

@@ -99,7 +99,12 @@ mod transmit_buf;
 use transmit_buf::TransmitBuf;
 
 mod state;
-use state::{State, StateType};
+
+#[cfg(not(fuzzing))]
+use state::State;
+#[cfg(fuzzing)]
+pub use state::State;
+use state::StateType;
 
 /// Protocol state and logic for a single QUIC connection
 ///

quinn-proto/src/connection/state.rs

@@ -40,8 +40,9 @@ impl State {
         }
     }
 
-    #[cfg(test)]
-    pub(super) fn established() -> Self {
+    #[allow(unreachable_pub)] // fuzzing only
+    #[cfg(any(test, fuzzing))]
+    pub fn established() -> Self {
         Self {
             inner: InnerState::Established,
         }