chanmgr, testing: Provide config accessor for testing

The top-level global config is going to want to see whether its
machinations have the right effect.

crates/tor-chanmgr/Cargo.toml

@@ -12,6 +12,7 @@ categories = ["network-programming", "cryptography"]
 repository = "https://gitlab.torproject.org/tpo/core/arti.git/"
 
 [features]
+testing = [ ]
 
 [dependencies]
 async-trait = "0.1.2"

crates/tor-chanmgr/src/config.rs

@@ -24,6 +24,14 @@ pub struct ChannelConfig {
 }
 impl_standard_builder! { ChannelConfig }
 
+#[cfg(feature = "testing")]
+impl ChannelConfig {
+    /// The padding level (accessor for testing)
+    pub fn padding(&self) -> PaddingLevel {
+        self.padding
+    }
+}
+
 #[cfg(test)]
 mod test {
     // @@ begin test lint list maintained by maint/add_warning @@