diff --git a/src/sharry/ids.rs b/src/sharry/ids.rs
index 3705dcd..36ed596 100644
--- a/src/sharry/ids.rs
+++ b/src/sharry/ids.rs
@@ -117,24 +117,22 @@ mod tests {
         for input in inputs {
             {
                 // check AliasID
-                let _ = AliasID(input.to_string()); // direct creation
                 let aid = AliasID::from(input.to_string());
-                check_trait(&input, &aid.0, "From<String>", "AliasID");
-                check_trait(&input, &aid.as_ref(), "AsRef<str>", "AliasID");
+                check_trait(&aid.0, input, "From<String>", "AliasID");
+                check_trait(aid.as_ref(), input, "AsRef<str>", "AliasID");
             }
 
             {
                 // check ShareID
-                let _ = ShareID(input.to_string()); // direct creation
                 let sid = ShareID::from(input.to_string());
-                check_trait(&input, &sid.0, "From<String>", "ShareID");
-                check_trait(&input, &sid.to_string(), "Display", "ShareID");
+                check_trait(&sid.0, input, "From<String>", "ShareID");
+                check_trait(sid.to_string(), input, "Display", "ShareID");
             }
 
             {
                 // check FileID
-                let fid = FileID(input.to_string()); // direct creation
-                check_trait(&input, &fid.to_string(), "Display", "FileID");
+                let fid = FileID(input.to_string());
+                check_trait(fid.to_string(), input, "Display", "FileID");
             }
         }
     }
diff --git a/src/sharry/uri.rs b/src/sharry/uri.rs
index 84564f1..7745264 100644
--- a/src/sharry/uri.rs
+++ b/src/sharry/uri.rs
@@ -115,8 +115,8 @@ mod tests {
 
         for uri_data in cases {
             let uri = Uri(uri_data.to_string());
-            check_trait(&uri_data, &uri.to_string(), "Display", "Uri");
-            check_trait(&uri_data.as_bytes(), &uri.as_ref(), "AsRef<[u8]>", "Uri");
+            check_trait(uri.to_string(), uri_data, "Display", "Uri");
+            check_trait(uri.as_ref(), uri_data.as_bytes(), "AsRef<[u8]>", "Uri");
         }
     }
 
@@ -137,7 +137,7 @@ mod tests {
 
         for (good, expected) in cases {
             let uri = Uri::from(good.to_string());
-            check_trait(&expected, &uri.0, "From<String>", "Uri");
+            check_trait(uri.0, expected, "From<String>", "Uri");
         }
     }
 
@@ -159,7 +159,7 @@ mod tests {
 
         for bad in cases {
             let uri = Uri::from(bad.to_string());
-            check_trait(&bad, &uri.0, "From<String>", "Uri");
+            check_trait(uri.0, bad, "From<String>", "Uri");
         }
     }
 
diff --git a/src/test_util/mod.rs b/src/test_util/mod.rs
index fbca94c..8cba747 100644
--- a/src/test_util/mod.rs
+++ b/src/test_util/mod.rs
@@ -6,14 +6,15 @@ use std::{fmt, io::Write};
 
 use tempfile::NamedTempFile;
 
-pub fn check_trait<E, A>(expected: &E, actual: &A, tr: &'static str, ty: &'static str)
+pub fn check_trait<A, E>(actual: A, expected: E, tr: &str, ty: &str)
 where
-    E: fmt::Debug + PartialEq<A>,
-    A: fmt::Debug,
+    A: fmt::Debug + PartialEq<E>,
+    E: fmt::Debug,
 {
     assert_eq!(
+        actual, expected,
+        "`impl {tr} for {ty}` expected: {:?}, actual: {:?}",
         expected, actual,
-        "`impl {tr} for {ty}` expected: {expected:?}, actual: {actual:?}",
     );
 }