Function TestEditFiles_FuzzyIndent_InsertionLevelAware

agent/agentfiles/files_test.go:2800–3119

TestEditFiles_FuzzyIndent_InsertionLevelAware covers indent- propagation bugs that fire when the caller's search/replace whitespace differs from the file's (tab vs space, 2sp vs 4sp). - Red_* cases assert the correct output that the indent-unit translation produces for inserted splice lines. - Lock

(t *testing.T)

//     that the insertion-only fix does not cover; tracked in
//     CODAGT-214.
func TestEditFiles_FuzzyIndent_InsertionLevelAware(t *testing.T) {
	t.Parallel()

	tmpdir := os.TempDir()
	logger := slogtest.Make(t, &slogtest.Options{IgnoreErrors: true}).Leveled(slog.LevelDebug)

	type edit struct {
		search, replace string
		replaceAll      bool
	}
	tests := []struct {
		name     string
		content  string
		edits    []edit
		expected string
	}{
		// Wrap an existing line in a new block. Tab file, 4sp caller.
		{
			name: "Red_WrapInBlock_TabFile_4spLLM",
			content: "func main() {\n" +
				"\tfmt.Println(\"hello\")\n" +
				"\tfmt.Println(\"world\")\n" +
				"}\n",
			edits: []edit{{
				search: "    fmt.Println(\"hello\")\n" +
					"    fmt.Println(\"world\")",
				replace: "    fmt.Println(\"hello\")\n" +
					"    if verbose {\n" +
					"        fmt.Println(\"world\")\n" +
					"    }",
			}},
			expected: "func main() {\n" +
				"\tfmt.Println(\"hello\")\n" +
				"\tif verbose {\n" +
				"\t\tfmt.Println(\"world\")\n" +
				"\t}\n" +
				"}\n",
		},

		// Wrap in a new block, 2sp file, 4sp caller. The common
		// real-world trigger: Claude/GPT default 4sp into a 2sp file.
		{
			name: "Red_WrapInBlock_2spFile_4spLLM",
			content: "function main() {\n" +
				"  console.log('hello')\n" +
				"  console.log('world')\n" +
				"}\n",
			edits: []edit{{
				search: "    console.log('hello')\n" +
					"    console.log('world')",
				replace: "    console.log('hello')\n" +
					"    if (verbose) {\n" +
					"        console.log('world')\n" +
					"    }",
			}},
			expected: "function main() {\n" +
				"  console.log('hello')\n" +
				"  if (verbose) {\n" +