From 80a8719253180efc68ee1d63c23580700f702d60 Mon Sep 17 00:00:00 2001
From: hermes <hermes@obahan.xyz>
Date: Wed, 30 Sep 2026 21:59:32 +0200
Subject: [PATCH] add internal/infra/m3u_test.go

---
 internal/infra/m3u_test.go | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 internal/infra/m3u_test.go

diff --git a/internal/infra/m3u_test.go b/internal/infra/m3u_test.go
new file mode 100644
index 0000000..2eb99d3
--- /dev/null
+++ b/internal/infra/m3u_test.go
@@ -0,0 +1,35 @@
+package infra
+
+import (
+	"strings"
+	"testing"
+
+	"radio-go/internal/domain"
+)
+
+func TestWriteM3U(t *testing.T) {
+	pl := []domain.Track{
+		{ID: "a", Title: "Alpha", Duration: 123.7},
+		{ID: "b", Title: "", Style: "beta style", Duration: 45},
+	}
+	got := WriteM3U("My Station", pl)
+	want := "#EXTM3U\n" +
+		"#EXTINF:123,My Station - Alpha\na.mp3\n" +
+		"#EXTINF:45,My Station - beta style\nb.mp3\n"
+	if got != want {
+		t.Fatalf("m3u mismatch:\n got:\n%s\nwant:\n%s", got, want)
+	}
+}
+
+func TestM3ULineSafe(t *testing.T) {
+	pl := []domain.Track{{ID: "x", Title: "evil\n#EXTINF:99,hack", Duration: 1}}
+	got := WriteM3U("st", pl)
+	lines := strings.Split(strings.TrimSpace(got), "\n")
+	// header + 1 extinf + 1 file = 3 lines; the injected newline must be neutralized
+	if len(lines) != 3 {
+		t.Fatalf("newline injection not sanitized: %q", got)
+	}
+	if strings.Contains(lines[1], "\n") || strings.Count(got, "#EXTINF") != 1 {
+		t.Fatalf("injected EXTINF survived: %q", got)
+	}
+}