diff --git a/Cargo.toml b/Cargo.toml
index aafb1533..bff4600a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "web-push"
 description = "Web push notification client with support for http-ece encryption and VAPID authentication."
-version = "0.9.0"
+version = "0.9.1"
 authors = ["Julius de Bruijn <julius+github@nauk.io>", "Andrew Ealovega <Andrew@Ealovega.dev>"]
 license = "Apache-2.0"
 homepage = "https://github.com/pimeys/rust-web-push"
diff --git a/src/clients/hyper_client.rs b/src/clients/hyper_client.rs
index 11277f2d..5490b001 100644
--- a/src/clients/hyper_client.rs
+++ b/src/clients/hyper_client.rs
@@ -1,3 +1,5 @@
+use std::convert::Infallible;
+
 use http::header::{CONTENT_LENGTH, RETRY_AFTER};
 use hyper::{body::HttpBody, client::HttpConnector, Body, Client, Request as HttpRequest};
 use hyper_tls::HttpsConnector;
@@ -5,7 +7,6 @@ use hyper_tls::HttpsConnector;
 use crate::clients::request_builder;
 use crate::error::{RetryAfter, WebPushError};
 use crate::message::WebPushMessage;
-use std::convert::Infallible;
 
 /// An async client for sending the notification payload.
 ///
diff --git a/src/clients/isahc_client.rs b/src/clients/isahc_client.rs
index b087d3d5..cf494fad 100644
--- a/src/clients/isahc_client.rs
+++ b/src/clients/isahc_client.rs
@@ -1,10 +1,10 @@
+use futures_lite::AsyncReadExt;
 use http::header::{CONTENT_LENGTH, RETRY_AFTER};
 use isahc::HttpClient;
 
 use crate::clients::request_builder;
 use crate::error::{RetryAfter, WebPushError};
 use crate::message::WebPushMessage;
-use futures_lite::AsyncReadExt;
 
 /// An async client for sending the notification payload. This client is expensive to create, and
 /// should be reused.
diff --git a/src/clients/request_builder.rs b/src/clients/request_builder.rs
index 92caa18f..5e567188 100644
--- a/src/clients/request_builder.rs
+++ b/src/clients/request_builder.rs
@@ -1,10 +1,11 @@
 //! Functions used to send and consume push http messages.
 //! This module can be used to build custom clients.
 
-use crate::{error::WebPushError, message::WebPushMessage};
 use http::header::{CONTENT_ENCODING, CONTENT_LENGTH, CONTENT_TYPE};
 use http::{Request, StatusCode};
 
+use crate::{error::WebPushError, message::WebPushMessage};
+
 #[derive(Deserialize, Serialize, Debug, PartialEq)]
 struct ErrorInfo {
     code: u16,
@@ -87,11 +88,12 @@ pub fn parse_response(response_status: StatusCode, body: Vec<u8>) -> Result<(),
 
 #[cfg(test)]
 mod tests {
+    use http::Uri;
+
     use crate::clients::request_builder::*;
     use crate::error::WebPushError;
     use crate::http_ece::ContentEncoding;
     use crate::message::WebPushMessageBuilder;
-    use http::Uri;
 
     #[test]
     fn builds_a_correct_request_with_empty_payload() {
diff --git a/src/error.rs b/src/error.rs
index 2b2c68be..921461d4 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -1,11 +1,12 @@
-use base64::DecodeError;
-use http::uri::InvalidUri;
-use serde_json::error::Error as JsonError;
 use std::string::FromUtf8Error;
 use std::time::{Duration, SystemTime};
 use std::{convert::From, error::Error, fmt, io::Error as IoError};
 
-#[derive(PartialEq, Debug)]
+use base64::DecodeError;
+use http::uri::InvalidUri;
+use serde_json::error::Error as JsonError;
+
+#[derive(PartialEq, Debug, Clone, Ord, PartialOrd, Eq, Deserialize, Serialize, Hash)]
 pub enum WebPushError {
     /// An unknown error happened encrypting the message,
     Unspecified,
diff --git a/src/http_ece.rs b/src/http_ece.rs
index ac1bdd7e..54c2fe4b 100644
--- a/src/http_ece.rs
+++ b/src/http_ece.rs
@@ -1,7 +1,8 @@
+use ece::encrypt;
+
 use crate::error::WebPushError;
 use crate::message::WebPushPayload;
 use crate::vapid::VapidSignature;
-use ece::encrypt;
 
 /// Content encoding profiles.
 pub enum ContentEncoding {
@@ -78,12 +79,13 @@ impl<'a> HttpEce<'a> {
 
 #[cfg(test)]
 mod tests {
+    use base64::{self, URL_SAFE};
+    use regex::Regex;
+
     use crate::error::WebPushError;
     use crate::http_ece::{ContentEncoding, HttpEce};
     use crate::VapidSignature;
     use crate::WebPushPayload;
-    use base64::{self, URL_SAFE};
-    use regex::Regex;
 
     #[test]
     fn test_payload_too_big() {
diff --git a/src/lib.rs b/src/lib.rs
index c3903afa..ee438746 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -42,29 +42,24 @@
 //! # }
 //! ```
 
-#[macro_use]
-extern crate serde_derive;
 #[macro_use]
 extern crate log;
-
-mod clients;
-mod error;
-mod http_ece;
-mod message;
-mod vapid;
+#[macro_use]
+extern crate serde_derive;
 
 #[cfg(feature = "hyper-client")]
 pub use crate::clients::hyper_client::WebPushClient;
-
 #[cfg(not(feature = "hyper-client"))]
 pub use crate::clients::isahc_client::WebPushClient;
-
+pub use crate::clients::request_builder;
 pub use crate::error::WebPushError;
-
-pub use crate::message::{SubscriptionInfo, SubscriptionKeys, WebPushMessage, WebPushMessageBuilder, WebPushPayload};
-
 pub use crate::http_ece::ContentEncoding;
+pub use crate::message::{SubscriptionInfo, SubscriptionKeys, WebPushMessage, WebPushMessageBuilder, WebPushPayload};
 pub use crate::vapid::builder::PartialVapidSignatureBuilder;
 pub use crate::vapid::{VapidSignature, VapidSignatureBuilder};
 
-pub use crate::clients::request_builder;
+mod clients;
+mod error;
+mod http_ece;
+mod message;
+mod vapid;
diff --git a/src/message.rs b/src/message.rs
index 9b9fb042..23240d35 100644
--- a/src/message.rs
+++ b/src/message.rs
@@ -1,10 +1,11 @@
+use http::uri::Uri;
+
 use crate::error::WebPushError;
 use crate::http_ece::{ContentEncoding, HttpEce};
 use crate::vapid::VapidSignature;
-use http::uri::Uri;
 
 /// Encryption keys from the client.
-#[derive(Debug, Deserialize, Serialize)]
+#[derive(Debug, Deserialize, Serialize, Clone, Eq, PartialEq, Ord, PartialOrd, Default, Hash)]
 pub struct SubscriptionKeys {
     /// The public key. Base64 encoded.
     pub p256dh: String,
@@ -16,7 +17,7 @@ pub struct SubscriptionKeys {
 /// subscription info JSON data (AKA pushSubscription object).
 ///
 /// Client pushSubscription objects can be directly deserialized into this struct using serde.
-#[derive(Debug, Deserialize, Serialize)]
+#[derive(Debug, Deserialize, Serialize, Clone, Eq, PartialEq, Ord, PartialOrd, Default, Hash)]
 pub struct SubscriptionInfo {
     /// The endpoint URI for sending the notification.
     pub endpoint: String,
diff --git a/src/vapid/builder.rs b/src/vapid/builder.rs
index 8b4c9b66..85c9d0ac 100644
--- a/src/vapid/builder.rs
+++ b/src/vapid/builder.rs
@@ -1,12 +1,14 @@
+use std::collections::BTreeMap;
+use std::io::Read;
+
+use http::uri::Uri;
+use jwt_simple::prelude::*;
+use serde_json::Value;
+
 use crate::error::WebPushError;
 use crate::message::SubscriptionInfo;
 use crate::vapid::signer::Claims;
 use crate::vapid::{VapidKey, VapidSignature, VapidSigner};
-use http::uri::Uri;
-use jwt_simple::prelude::*;
-use serde_json::Value;
-use std::collections::BTreeMap;
-use std::io::Read;
 
 /// A VAPID signature builder for generating an optional signature to the
 /// request. This encryption is required for payloads in all current and future browsers.
@@ -241,10 +243,12 @@ impl<'a> PartialVapidSignatureBuilder {
 
 #[cfg(test)]
 mod tests {
+    use std::fs::File;
+
+    use ::lazy_static::lazy_static;
+
     use crate::message::SubscriptionInfo;
     use crate::vapid::VapidSignatureBuilder;
-    use ::lazy_static::lazy_static;
-    use std::fs::File;
 
     lazy_static! {
         static ref PRIVATE_PEM: File = File::open("resources/vapid_test_key.pem").unwrap();
diff --git a/src/vapid/key.rs b/src/vapid/key.rs
index 54c21b6f..0f458541 100644
--- a/src/vapid/key.rs
+++ b/src/vapid/key.rs
@@ -22,9 +22,10 @@ impl VapidKey {
 
 #[cfg(test)]
 mod tests {
-    use crate::vapid::key::VapidKey;
     use std::fs::File;
 
+    use crate::vapid::key::VapidKey;
+
     #[test]
     /// Tests that VapidKey derives the correct public key.
     fn test_public_key_derivation() {
diff --git a/src/vapid/mod.rs b/src/vapid/mod.rs
index b451404a..b8366d59 100644
--- a/src/vapid/mod.rs
+++ b/src/vapid/mod.rs
@@ -1,11 +1,11 @@
 //! Contains tooling for signing with VAPID.
 
-pub mod builder;
-mod key;
-mod signer;
-
 pub use self::builder::VapidSignatureBuilder;
 use self::key::VapidKey;
 pub use self::signer::Claims;
 pub use self::signer::VapidSignature;
 use self::signer::VapidSigner;
+
+pub mod builder;
+mod key;
+mod signer;
diff --git a/src/vapid/signer.rs b/src/vapid/signer.rs
index 8d8a07c4..ea2171a9 100644
--- a/src/vapid/signer.rs
+++ b/src/vapid/signer.rs
@@ -1,12 +1,14 @@
-use crate::{error::WebPushError, vapid::VapidKey};
+use std::collections::BTreeMap;
+
 use http::uri::Uri;
 use jwt_simple::prelude::*;
 use serde_json::Value;
-use std::collections::BTreeMap;
+
+use crate::{error::WebPushError, vapid::VapidKey};
 
 /// A struct representing a VAPID signature. Should be generated using the
 /// [VapidSignatureBuilder](struct.VapidSignatureBuilder.html).
-#[derive(Debug)]
+#[derive(Debug, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
 pub struct VapidSignature {
     /// The signed JWT, base64 encoded
     pub auth_t: String,