diff --git a/tests/test.rs b/tests/test.rs
index d32af6e..12245da 100644
--- a/tests/test.rs
+++ b/tests/test.rs
@@ -1,6 +1,16 @@
 use std::fmt::{self, Display};
 use thiserror::Error;
 
+macro_rules! unimplemented_display {
+    ($ty:ty) => {
+        impl Display for $ty {
+            fn fmt(&self, _formatter: &mut fmt::Formatter) -> fmt::Result {
+                unimplemented!()
+            }
+        }
+    };
+}
+
 #[derive(Error, Debug)]
 struct BracedError {
     msg: String,
@@ -13,20 +23,6 @@ struct TupleError(String, usize);
 #[derive(Error, Debug)]
 struct UnitError;
 
-impl Display for BracedError {
-    fn fmt(&self, _formatter: &mut fmt::Formatter) -> fmt::Result {
-        unimplemented!()
-    }
-}
-
-impl Display for TupleError {
-    fn fmt(&self, _formatter: &mut fmt::Formatter) -> fmt::Result {
-        unimplemented!()
-    }
-}
-
-impl Display for UnitError {
-    fn fmt(&self, _formatter: &mut fmt::Formatter) -> fmt::Result {
-        unimplemented!()
-    }
-}
+unimplemented_display!(BracedError);
+unimplemented_display!(TupleError);
+unimplemented_display!(UnitError);