add core lib

smtp/smtp_mailer_additional_test.go

@@ -0,0 +1,126 @@
+package smtp
+
+import (
+	"context"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestSendReturnsConfigurationErrorWhenSMTPMissing(t *testing.T) {
+	mailer := NewSMTPMailer(SMTPConfig{Host: "", Port: 587, From: "noreply@example.com", Mode: SMTPModeTLS})
+
+	err := mailer.Send(context.Background(), "to@example.com", "subject", "<p>body</p>", "body")
+	if err == nil {
+		t.Fatal("expected configuration error")
+	}
+	if !strings.Contains(err.Error(), "smtp is not configured") {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestSendReturnsDeadlineExceededForExpiredContext(t *testing.T) {
+	mailer := NewSMTPMailer(SMTPConfig{Host: "smtp.example.com", Port: 587, From: "noreply@example.com", Mode: SMTPModeTLS})
+	ctx, cancel := context.WithDeadline(context.Background(), time.Now().Add(-time.Second))
+	defer cancel()
+
+	err := mailer.Send(ctx, "to@example.com", "subject", "<p>body</p>", "body")
+	if err == nil {
+		t.Fatal("expected context deadline exceeded")
+	}
+	if err != context.DeadlineExceeded {
+		t.Fatalf("expected context deadline exceeded, got %v", err)
+	}
+}
+
+func TestLoginAuthNextHandlesChallenges(t *testing.T) {
+	auth := loginAuth{username: "alice", password: "s3cret"}
+
+	proto, initial, err := auth.Start(nil)
+	if err != nil {
+		t.Fatalf("unexpected start error: %v", err)
+	}
+	if proto != "LOGIN" {
+		t.Fatalf("expected LOGIN auth proto, got %q", proto)
+	}
+	if len(initial) != 0 {
+		t.Fatalf("expected empty initial response, got %q", string(initial))
+	}
+
+	value, err := auth.Next([]byte("Username:"), true)
+	if err != nil {
+		t.Fatalf("unexpected username challenge error: %v", err)
+	}
+	if string(value) != "alice" {
+		t.Fatalf("expected username response alice, got %q", string(value))
+	}
+
+	value, err = auth.Next([]byte("UGFzc3dvcmQ6"), true)
+	if err != nil {
+		t.Fatalf("unexpected password challenge error: %v", err)
+	}
+	if string(value) != "s3cret" {
+		t.Fatalf("expected password response s3cret, got %q", string(value))
+	}
+}
+
+func TestLoginAuthNextHandlesTerminalAndUnexpectedChallenge(t *testing.T) {
+	auth := loginAuth{username: "alice", password: "s3cret"}
+
+	value, err := auth.Next([]byte("ignored"), false)
+	if err != nil {
+		t.Fatalf("expected nil error when more=false, got %v", err)
+	}
+	if value != nil {
+		t.Fatalf("expected nil value when more=false, got %q", string(value))
+	}
+
+	if _, err := auth.Next([]byte("realm"), true); err == nil {
+		t.Fatal("expected error for unexpected login challenge")
+	}
+}
+
+func TestBuildMIMEMessageContainsMultipartSections(t *testing.T) {
+	msg := buildMIMEMessage("from@example.com", "to@example.com", "Subject", "plain body", "<p>html body</p>")
+
+	checks := []string{
+		"From: from@example.com",
+		"To: to@example.com",
+		"Subject: Subject",
+		"MIME-Version: 1.0",
+		"Content-Type: text/plain; charset=UTF-8",
+		"plain body",
+		"Content-Type: text/html; charset=UTF-8",
+		"<p>html body</p>",
+	}
+	for _, snippet := range checks {
+		if !strings.Contains(msg, snippet) {
+			t.Fatalf("expected MIME message to contain %q", snippet)
+		}
+	}
+	if !strings.Contains(msg, "\r\n") {
+		t.Fatal("expected CRLF separators in MIME message")
+	}
+
+	if !strings.Contains(msg, "Content-Type: multipart/alternative; boundary=mime-boundary-") {
+		t.Fatalf("expected random mime boundary header, got %q", msg)
+	}
+	if !strings.Contains(msg, "--mime-boundary-") {
+		t.Fatalf("expected mime boundary delimiters in message, got %q", msg)
+	}
+}
+
+func TestDialHelpersReturnDeadlineExceededWhenDeadlineHasPassed(t *testing.T) {
+	deadline := time.Now().Add(-time.Second)
+	ctx := context.Background()
+
+	if _, err := dialPlain(ctx, "smtp.example.com:25", "smtp.example.com", deadline); err != context.DeadlineExceeded {
+		t.Fatalf("dialPlain expected context deadline exceeded, got %v", err)
+	}
+	if _, err := dialSSL(ctx, "smtp.example.com:465", "smtp.example.com", deadline); err != context.DeadlineExceeded {
+		t.Fatalf("dialSSL expected context deadline exceeded, got %v", err)
+	}
+	if _, err := dialStartTLS(ctx, "smtp.example.com:587", "smtp.example.com", deadline); err != context.DeadlineExceeded {
+		t.Fatalf("dialStartTLS expected context deadline exceeded, got %v", err)
+	}
+}