diff --git a/src/safe_outputs/comment_on_work_item.rs b/src/safe_outputs/comment_on_work_item.rs
index 7adab3ae..5d64b116 100644
--- a/src/safe_outputs/comment_on_work_item.rs
+++ b/src/safe_outputs/comment_on_work_item.rs
@@ -387,7 +387,11 @@ mod tests {
             body: "This is a valid comment body text.".to_string(),
         };
         let result: Result<CommentOnWorkItemResult, _> = params.try_into();
-        assert!(result.is_err());
+        let err = result.unwrap_err().to_string();
+        assert!(
+            err.contains("work_item_id must be positive"),
+            "unexpected error: {err}"
+        );
     }
 
     #[test]
@@ -397,7 +401,11 @@ mod tests {
             body: "This is a valid comment body text.".to_string(),
         };
         let result: Result<CommentOnWorkItemResult, _> = params.try_into();
-        assert!(result.is_err());
+        let err = result.unwrap_err().to_string();
+        assert!(
+            err.contains("work_item_id must be positive"),
+            "unexpected error: {err}"
+        );
     }
 
     #[test]
@@ -407,7 +415,11 @@ mod tests {
             body: "Too short".to_string(),
         };
         let result: Result<CommentOnWorkItemResult, _> = params.try_into();
-        assert!(result.is_err());
+        let err = result.unwrap_err().to_string();
+        assert!(
+            err.contains("body must be at least 10 characters"),
+            "unexpected error: {err}"
+        );
     }
 
     #[test]
diff --git a/src/safe_outputs/create_git_tag.rs b/src/safe_outputs/create_git_tag.rs
index 92a88df5..2dd8f1e9 100644
--- a/src/safe_outputs/create_git_tag.rs
+++ b/src/safe_outputs/create_git_tag.rs
@@ -463,7 +463,11 @@ mod tests {
             repository: None,
         };
         let result: Result<CreateGitTagResult, _> = params.try_into();
-        assert!(result.is_err());
+        let err = result.unwrap_err().to_string();
+        assert!(
+            err.contains("message must be at least 5 characters"),
+            "unexpected error: {err}"
+        );
     }
 
     #[test]
@@ -475,7 +479,11 @@ mod tests {
             repository: Some("##vso[task.setvariable variable=x]y".to_string()),
         };
         let result: Result<CreateGitTagResult, _> = params.try_into();
-        assert!(result.is_err());
+        let err = result.unwrap_err().to_string();
+        assert!(
+            err.contains("pipeline command"),
+            "unexpected error: {err}"
+        );
     }
 
     #[test]