diff --git a/Cargo.toml b/Cargo.toml
index a273433..f27c33d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -72,6 +72,7 @@ ed25519-dalek = { version = "1.0.1", optional = true }
 email_address = { version = "0.2.1", default-features = false }
 
 [dev-dependencies]
+pretty_assertions = "1"
 criterion = "0.3"
 tracing-subscriber = "0.3"
 glob = "0.3"
diff --git a/src/message/body.rs b/src/message/body.rs
index 74386af..b234c62 100644
--- a/src/message/body.rs
+++ b/src/message/body.rs
@@ -285,6 +285,8 @@ fn find_all_lf_char_indices(s: &str) -> Vec<usize> {
 
 #[cfg(test)]
 mod test {
+    use pretty_assertions::assert_eq;
+
     use super::{in_place_crlf_line_endings, Body, ContentTransferEncoding};
 
     #[test]
diff --git a/src/message/dkim.rs b/src/message/dkim.rs
index d72782d..01f08d8 100644
--- a/src/message/dkim.rs
+++ b/src/message/dkim.rs
@@ -409,6 +409,8 @@ fn dkim_sign_fixed_time(message: &mut Message, dkim_config: &DkimConfig, timesta
 
 #[cfg(test)]
 mod test {
+    use pretty_assertions::assert_eq;
+
     use super::{
         super::{
             header::{HeaderName, HeaderValue},
diff --git a/src/message/header/content.rs b/src/message/header/content.rs
index 028029b..596dfc3 100644
--- a/src/message/header/content.rs
+++ b/src/message/header/content.rs
@@ -75,6 +75,8 @@ impl Default for ContentTransferEncoding {
 
 #[cfg(test)]
 mod test {
+    use pretty_assertions::assert_eq;
+
     use super::ContentTransferEncoding;
     use crate::message::header::{HeaderName, HeaderValue, Headers};
 
diff --git a/src/message/header/content_disposition.rs b/src/message/header/content_disposition.rs
index d66fafd..df8e0bd 100644
--- a/src/message/header/content_disposition.rs
+++ b/src/message/header/content_disposition.rs
@@ -77,6 +77,8 @@ impl Header for ContentDisposition {
 
 #[cfg(test)]
 mod test {
+    use pretty_assertions::assert_eq;
+
     use super::ContentDisposition;
     use crate::message::header::{HeaderName, HeaderValue, Headers};
 
diff --git a/src/message/header/content_type.rs b/src/message/header/content_type.rs
index 5a588db..aac911f 100644
--- a/src/message/header/content_type.rs
+++ b/src/message/header/content_type.rs
@@ -149,6 +149,8 @@ mod serde {
 
 #[cfg(test)]
 mod test {
+    use pretty_assertions::assert_eq;
+
     use super::ContentType;
     use crate::message::header::{HeaderName, HeaderValue, Headers};
 
diff --git a/src/message/header/date.rs b/src/message/header/date.rs
index 02dec3a..c1fe98f 100644
--- a/src/message/header/date.rs
+++ b/src/message/header/date.rs
@@ -74,6 +74,8 @@ impl From<Date> for SystemTime {
 mod test {
     use std::time::{Duration, SystemTime};
 
+    use pretty_assertions::assert_eq;
+
     use super::Date;
     use crate::message::header::{HeaderName, HeaderValue, Headers};
 
diff --git a/src/message/header/mailbox.rs b/src/message/header/mailbox.rs
index 05fa41a..7ca4ba1 100644
--- a/src/message/header/mailbox.rs
+++ b/src/message/header/mailbox.rs
@@ -172,6 +172,8 @@ mailboxes_header! {
 
 #[cfg(test)]
 mod test {
+    use pretty_assertions::assert_eq;
+
     use super::{From, Mailbox, Mailboxes};
     use crate::message::header::{HeaderName, HeaderValue, Headers};
 
diff --git a/src/message/header/mod.rs b/src/message/header/mod.rs
index 8053b8c..6f5b1d4 100644
--- a/src/message/header/mod.rs
+++ b/src/message/header/mod.rs
@@ -569,6 +569,8 @@ const fn allowed_char(c: char) -> bool {
 
 #[cfg(test)]
 mod tests {
+    use pretty_assertions::assert_eq;
+
     use super::{HeaderName, HeaderValue, Headers};
 
     #[test]
diff --git a/src/message/header/special.rs b/src/message/header/special.rs
index a05c0e2..f1a3f3b 100644
--- a/src/message/header/special.rs
+++ b/src/message/header/special.rs
@@ -64,6 +64,8 @@ impl Default for MimeVersion {
 
 #[cfg(test)]
 mod test {
+    use pretty_assertions::assert_eq;
+
     use super::{MimeVersion, MIME_VERSION_1_0};
     use crate::message::header::{HeaderName, HeaderValue, Headers};
 
diff --git a/src/message/header/textual.rs b/src/message/header/textual.rs
index 2c49ae3..bf8c628 100644
--- a/src/message/header/textual.rs
+++ b/src/message/header/textual.rs
@@ -85,6 +85,8 @@ text_header! {
 
 #[cfg(test)]
 mod test {
+    use pretty_assertions::assert_eq;
+
     use super::Subject;
     use crate::message::header::{HeaderName, HeaderValue, Headers};
 
diff --git a/src/message/mailbox/serde.rs b/src/message/mailbox/serde.rs
index 64868c3..a20dfd8 100644
--- a/src/message/mailbox/serde.rs
+++ b/src/message/mailbox/serde.rs
@@ -154,6 +154,7 @@ impl<'de> Deserialize<'de> for Mailboxes {
 
 #[cfg(test)]
 mod test {
+    use pretty_assertions::assert_eq;
     use serde_json::from_str;
 
     use super::*;
diff --git a/src/message/mailbox/types.rs b/src/message/mailbox/types.rs
index 64b1952..8d51b33 100644
--- a/src/message/mailbox/types.rs
+++ b/src/message/mailbox/types.rs
@@ -471,6 +471,8 @@ fn write_quoted_string_char(f: &mut Formatter<'_>, c: u8) -> FmtResult {
 mod test {
     use std::convert::TryInto;
 
+    use pretty_assertions::assert_eq;
+
     use super::Mailbox;
 
     #[test]
diff --git a/src/message/mimebody.rs b/src/message/mimebody.rs
index 3ab5620..896626b 100644
--- a/src/message/mimebody.rs
+++ b/src/message/mimebody.rs
@@ -398,6 +398,8 @@ impl EmailFormat for MultiPart {
 
 #[cfg(test)]
 mod test {
+    use pretty_assertions::assert_eq;
+
     use super::*;
     use crate::message::header;
 
diff --git a/src/message/mod.rs b/src/message/mod.rs
index 9b6564f..de0a041 100644
--- a/src/message/mod.rs
+++ b/src/message/mod.rs
@@ -598,6 +598,8 @@ fn make_message_id() -> String {
 mod test {
     use std::time::{Duration, SystemTime};
 
+    use pretty_assertions::assert_eq;
+
     use super::{header, mailbox::Mailbox, make_message_id, Message, MultiPart, SinglePart};
 
     #[test]