Initial commit

internal/mailer/mailer_test.go

@@ -0,0 +1,64 @@
+package mailer
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestFileModeAppendsMessages(t *testing.T) {
+	filePath := filepath.Join(t.TempDir(), "mails.log")
+	m, err := New(Config{
+		Mode:     ModeFile,
+		Sender:   "gardomatic@example.com",
+		FilePath: filePath,
+	})
+	if err != nil {
+		t.Fatalf("New() returned an error: %v", err)
+	}
+
+	data := map[string]any{
+		"userID":          42,
+		"activationToken": "test-token",
+	}
+	for _, recipient := range []string{"alice@example.com", "bob@example.com"} {
+		if err = m.Send(recipient, "user_welcome.tmpl", data); err != nil {
+			t.Fatalf("Send() returned an error: %v", err)
+		}
+	}
+
+	content, err := os.ReadFile(filePath)
+	if err != nil {
+		t.Fatalf("reading mail output: %v", err)
+	}
+	output := string(content)
+
+	if got := strings.Count(output, "=== gardomatic mail ==="); got != 2 {
+		t.Errorf("message count = %d, want 2", got)
+	}
+	for _, expected := range []string{
+		"alice@example.com",
+		"bob@example.com",
+		"Subject: Welcome to Gardomatic!",
+		"test-token",
+	} {
+		if !strings.Contains(output, expected) {
+			t.Errorf("output does not contain %q", expected)
+		}
+	}
+}
+
+func TestFileModeRequiresPath(t *testing.T) {
+	_, err := New(Config{Mode: ModeFile, Sender: "gardomatic@example.com"})
+	if err == nil {
+		t.Fatal("New() returned no error without a file path")
+	}
+}
+
+func TestNewRejectsUnknownMode(t *testing.T) {
+	_, err := New(Config{Mode: "unknown", Sender: "gardomatic@example.com"})
+	if err == nil {
+		t.Fatal("New() returned no error for an unknown mode")
+	}
+}