add core lib

smtp/smtp_mailer_test.go

@@ -0,0 +1,47 @@
+package smtp
+
+import (
+	"context"
+	"errors"
+	"testing"
+	"time"
+)
+
+func TestSendHonorsCanceledContext(t *testing.T) {
+	mailer := NewSMTPMailer(SMTPConfig{
+		Host: "smtp.example.com",
+		Port: 587,
+		From: "noreply@example.com",
+		Mode: SMTPModeTLS,
+	})
+
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+
+	err := mailer.Send(ctx, "to@example.com", "subject", "<p>hello</p>", "hello")
+	if !errors.Is(err, context.Canceled) {
+		t.Fatalf("expected %v, got %v", context.Canceled, err)
+	}
+}
+
+func TestSMTPSendDeadlineUsesContextDeadline(t *testing.T) {
+	now := time.Date(2026, time.January, 1, 12, 0, 0, 0, time.UTC)
+	want := now.Add(2 * time.Minute)
+	ctx, cancel := context.WithDeadline(context.Background(), want)
+	defer cancel()
+
+	got := smtpSendDeadline(ctx, now)
+	if !got.Equal(want) {
+		t.Fatalf("expected context deadline %v, got %v", want, got)
+	}
+}
+
+func TestSMTPSendDeadlineUsesDefaultWhenContextHasNoDeadline(t *testing.T) {
+	now := time.Date(2026, time.January, 1, 12, 0, 0, 0, time.UTC)
+	want := now.Add(defaultSMTPOperationTimeout)
+
+	got := smtpSendDeadline(context.Background(), now)
+	if !got.Equal(want) {
+		t.Fatalf("expected default deadline %v, got %v", want, got)
+	}
+}