diff --git a/Cargo.lock b/Cargo.lock
index ae3688f..8ad3b59 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -157,6 +157,12 @@ version = "0.8.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "248e3bacc7dc6baa3b21e405ee045c3047101a49145e7e9eca583ab4c2ca5345"
 
+[[package]]
+name = "diff"
+version = "0.1.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56254986775e3233ffa9c4d7d3faaf6d36a2c09d30b20687e9f88bc8bafc16c8"
+
 [[package]]
 name = "either"
 version = "1.9.0"
@@ -320,6 +326,16 @@ version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "eb9f9e6e233e5c4a35559a617bf40a4ec447db2e84c20b55a6f83167b7e57872"
 
+[[package]]
+name = "pretty_assertions"
+version = "1.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3ae130e2f271fbc2ac3a40fb1d07180839cdbbe443c7a27e1e3c13c5cac0116d"
+dependencies = [
+ "diff",
+ "yansi",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.78"
@@ -440,6 +456,7 @@ dependencies = [
  "clap",
  "eyre",
  "itertools",
+ "pretty_assertions",
  "rand",
  "rand_chacha",
  "rayon",
@@ -608,3 +625,9 @@ name = "windows_x86_64_msvc"
 version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1a515f5799fe4961cb532f983ce2b23082366b898e52ffbce459c86f67c8378a"
+
+[[package]]
+name = "yansi"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cfe53a6657fd280eaa890a3bc59152892ffa3e30101319d168b781ed6529b049"
diff --git a/Cargo.toml b/Cargo.toml
index 5fbeb41..6725184 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,6 +14,7 @@ rand = "0.8.5"
 regex = "1.10.6"
 
 [dev-dependencies]
+pretty_assertions = "1.4.1"
 rand_chacha = "0.3.1"
 rayon = "1.10.0"
 statrs = "0.17.1"
diff --git a/src/passphrase.rs b/src/passphrase.rs
index 91b87d7..2beeb5e 100644
--- a/src/passphrase.rs
+++ b/src/passphrase.rs
@@ -26,12 +26,15 @@ pub fn new<T: Rng>(
         .join(separator))
 }
 
+#[cfg(test)]
 mod test {
-    #[test]
+    use crate::{passphrase, words};
+    use pretty_assertions::assert_eq;
+
     // Uses [Pearson's chi-squared test](https://en.wikipedia.org/wiki/Chi-squared_test#Pearson's_chi-squared_test)
     // to test that the passphrases are uniformly distributed.
+    #[test]
     fn chi_squared() {
-        use crate::{passphrase, words};
         use itertools::Itertools;
         use rand_chacha::{rand_core::SeedableRng, ChaCha8Rng};
         use rayon::iter::{IndexedParallelIterator, IntoParallelRefIterator, ParallelIterator};