feat: add missing features for trailer integration

Author: dignifiedquire

src/headers/mod.rs

@@ -29,7 +29,7 @@ pub use to_header_values::ToHeaderValues;
 pub use values::Values;
 
 /// A collection of HTTP Headers.
-#[derive(Debug)]
+#[derive(Debug, PartialEq)]
 pub struct Headers {
     pub(crate) headers: HashMap<HeaderName, Vec<HeaderValue>>,
 }

src/headers/to_header_values.rs

@@ -40,3 +40,14 @@ impl<'a> ToHeaderValues for &'a str {
         Ok(Some(value).into_iter())
     }
 }
+
+impl ToHeaderValues for String {
+    type Iter = option::IntoIter<HeaderValue>;
+
+    fn to_header_values(&self) -> crate::Result<Self::Iter> {
+        let value = self
+            .parse()
+            .map_err(|err| io::Error::new(io::ErrorKind::Other, err))?;
+        Ok(Some(value).into_iter())
+    }
+}

src/trailers.rs

@@ -55,7 +55,7 @@ use std::convert::TryInto;
 use std::ops::{Deref, DerefMut};
 
 /// A collection of trailing HTTP headers.
-#[derive(Debug)]
+#[derive(Debug, PartialEq)]
 pub struct Trailers {
     headers: Headers,
 }
@@ -188,7 +188,7 @@ pub struct TrailersSender {
 
 impl TrailersSender {
     /// Create a new instance of `TrailersSender`.
-    pub(crate) fn new(sender: Sender<crate::Result<Trailers>>) -> Self {
+    pub fn new(sender: Sender<crate::Result<Trailers>>) -> Self {
         Self { sender }
     }