diff --git a/claudetool/testdata/gopls_line_number_changed.txtar b/claudetool/testdata/gopls_line_number_changed.txtar
new file mode 100644
index 0000000..c7eeb37
--- /dev/null
+++ b/claudetool/testdata/gopls_line_number_changed.txtar
@@ -0,0 +1,26 @@
+Pre-existing gopls issues with line number changes should not be reported as regressions
+
+-- p.go --
+package p
+
+func F() {
+	x := 42
+}
+
+-- .commit --
+Initial commit with existing gopls issue
+
+-- p.go --
+package p
+
+// Change the line number of the unused variable
+
+func F() {
+	x := 42
+}
+
+-- .commit --
+Add comments that change line numbers
+
+-- .run_test --
+OK