Use pretty assertions!

hammond-gtk/Cargo.toml

@@ -41,3 +41,6 @@ path = "../hammond-data"
 
 [dependencies.hammond-downloader]
 path = "../hammond-downloader"
+
+[dev-dependencies]
+pretty_assertions = "0.5.1"

hammond-gtk/src/main.rs

@@ -19,6 +19,10 @@ extern crate lazy_static;
 #[macro_use]
 extern crate log;
 
+#[cfg(test)]
+#[macro_use]
+extern crate pretty_assertions;
+
 extern crate ammonia;
 extern crate chrono;
 // extern crate dissolve;