diff --git a/testing/fake-diff-editor.rs b/testing/fake-diff-editor.rs
index 166dcd10c..7c803e575 100644
--- a/testing/fake-diff-editor.rs
+++ b/testing/fake-diff-editor.rs
@@ -61,8 +61,9 @@ fn main() {
                 let actual = files_recursively(&args.before);
                 if actual != expected {
                     eprintln!(
-                        "unexpected files before: {:?}",
-                        actual.iter().sorted().collect_vec()
+                        "fake-diff-editor: unexpected files before. EXPECTED: {:?} ACTUAL: {:?}",
+                        expected.iter().sorted().collect_vec(),
+                        actual.iter().sorted().collect_vec(),
                     );
                     exit(1)
                 }
@@ -72,8 +73,9 @@ fn main() {
                 let actual = files_recursively(&args.after);
                 if actual != expected {
                     eprintln!(
-                        "unexpected files after: {:?}",
-                        actual.iter().sorted().collect_vec()
+                        "fake-diff-editor: unexpected files after. EXPECTED: {:?} ACTUAL: {:?}",
+                        expected.iter().sorted().collect_vec(),
+                        actual.iter().sorted().collect_vec(),
                     );
                     exit(1)
                 }
@@ -92,7 +94,7 @@ fn main() {
                 std::fs::write(args.after.join(file), payload).unwrap();
             }
             _ => {
-                eprintln!("unexpected command: {}", command);
+                eprintln!("fake-diff-editor: unexpected command: {}", command);
                 exit(1)
             }
         }
diff --git a/testing/fake-editor.rs b/testing/fake-editor.rs
index 00d7321b6..c60c99f69 100644
--- a/testing/fake-editor.rs
+++ b/testing/fake-editor.rs
@@ -48,7 +48,8 @@ fn main() {
             ["expect"] => {
                 let actual = String::from_utf8(std::fs::read(&args.file).unwrap()).unwrap();
                 if actual != payload {
-                    eprintln!("unexpected content: {}", actual);
+                    eprintln!("fake-editor: Unexpected content.\n");
+                    eprintln!("EXPECTED: {payload}\nRECEIVED: {actual}");
                     exit(1)
                 }
             }
@@ -56,7 +57,7 @@ fn main() {
                 std::fs::write(&args.file, payload).unwrap();
             }
             _ => {
-                eprintln!("unexpected command: {}", command);
+                eprintln!("fake-editor: unexpected command: {}", command);
                 exit(1)
             }
         }