1 files changed, 28 insertions, 0 deletions
diff --git a/pkg/gitdiff/format_test.go b/pkg/gitdiff/format_test.go
new file mode 100644
index 0000000..3325296
--- /dev/null
+++ b/pkg/gitdiff/format_test.go
@@ -0,0 +1,28 @@
+package gitdiff
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestFormatter_WriteQuotedName(t *testing.T) {
+	tests := []struct {
+		Input    string
+		Expected string
+	}{
+		{"noquotes.txt", `noquotes.txt`},
+		{"no quotes.txt", `no quotes.txt`},
+		{"new\nline", `"new\nline"`},
+		{"escape\x1B null\x00", `"escape\033 null\000"`},
+		{"snowman \u2603 snowman", `"snowman \342\230\203 snowman"`},
+		{"\"already quoted\"", `"\"already quoted\""`},
+	}
+
+	for _, test := range tests {
+		var b strings.Builder
+		newFormatter(&b).WriteQuotedName(test.Input)
+		if b.String() != test.Expected {
+			t.Errorf("expected %q, got %q", test.Expected, b.String())
+		}
+	}
+}