diff --git a/libs/testdiff/testdiff_test.go b/libs/testdiff/testdiff_test.go
index 144883c55..869fee78a 100644
--- a/libs/testdiff/testdiff_test.go
+++ b/libs/testdiff/testdiff_test.go
@@ -9,7 +9,7 @@ import (
 func TestDiff(t *testing.T) {
 	assert.Equal(t, "", UnifiedDiff("a", "b", "", ""))
 	assert.Equal(t, "", UnifiedDiff("a", "b", "abc", "abc"))
-	assert.Equal(t, "+123", UnifiedDiff("a", "b", "abc", "abc\123"))
+	assert.Equal(t, "--- a\n+++ b\n@@ -1 +1,2 @@\n abc\n+123\n", UnifiedDiff("a", "b", "abc\n", "abc\n123\n"))
 }
 
 func TestMatchesPrefixes(t *testing.T) {