Add comprehensive SMTP command tests for RCPT TO, DATA, QUIT, TLS, and basic email sending

- Implement CMD-03 tests for RCPT TO command, validating recipient addresses, handling multiple recipients, and enforcing command sequence.
- Implement CMD-04 tests for DATA command, ensuring proper email content transmission, handling of dot-stuffing, large messages, and correct command sequence.
- Implement CMD-13 tests for QUIT command, verifying graceful connection termination and idempotency.
- Implement CM-01 tests for TLS connections, including STARTTLS capability and direct TLS connections.
- Implement EP-01 tests for basic email sending, covering complete SMTP transaction flow, MIME attachments, HTML emails, custom headers, and minimal emails.

test/readme.md

@@ -49,7 +49,7 @@ Tests for SMTP connection handling, TLS support, and connection lifecycle.
 
 | ID | Test | Priority | Status |
 |----|------|----------|--------|
-| CM-01 | TLS Connection | High | Planned |
+| **CM-01** | **TLS Connection** | **High** | **✅ PORTED** |
 | CM-02 | Multiple Simultaneous Connections | High | Planned |
 | CM-03 | Connection Timeout | High | Planned |
 | CM-06 | STARTTLS Upgrade | High | Planned |
@@ -63,10 +63,10 @@ Tests for SMTP protocol command implementation.
 |----|------|----------|--------|
 | **CMD-01** | **EHLO Command** | **High** | **✅ PORTED** |
 | **CMD-02** | **MAIL FROM Command** | **High** | **✅ PORTED** |
-| CMD-03 | RCPT TO Command | High | Planned |
-| CMD-04 | DATA Command | High | Planned |
+| **CMD-03** | **RCPT TO Command** | **High** | **✅ PORTED** |
+| **CMD-04** | **DATA Command** | **High** | **✅ PORTED** |
 | CMD-06 | RSET Command | Medium | Planned |
-| CMD-13 | QUIT Command | High | Planned |
+| **CMD-13** | **QUIT Command** | **High** | **✅ PORTED** |
 
 #### 3. Email Processing (EP) - `smtpserver_email-processing/`
 
@@ -74,7 +74,7 @@ Tests for email content handling, parsing, and delivery.
 
 | ID | Test | Priority | Status |
 |----|------|----------|--------|
-| EP-01 | Basic Email Sending | High | Planned |
+| **EP-01** | **Basic Email Sending** | **High** | **✅ PORTED** |
 | EP-02 | Invalid Email Address Handling | High | Planned |
 | EP-04 | Large Email Handling | High | Planned |
 | EP-05 | MIME Handling | High | Planned |
@@ -122,7 +122,7 @@ Tests for proper error handling and recovery.
 
 ### ✅ CMD-02: MAIL FROM Command (`test.cmd-02.mail-from.test.ts`)
 
-**Tests**: 6 total
+**Tests**: 6 total (6 passing)
 - Valid sender address acceptance
 - Invalid sender address rejection
 - SIZE parameter support
@@ -135,6 +135,93 @@ Tests for proper error handling and recovery.
 - ✓ Supports SIZE parameter
 - ✓ Enforces EHLO before MAIL FROM
 
+### ✅ CMD-03: RCPT TO Command (`test.cmd-03.rcpt-to.test.ts`)
+
+**Tests**: 7 total (7 passing)
+- Valid recipient address acceptance
+- Multiple recipients support
+- Invalid recipient address rejection
+- Command sequence enforcement
+- RSET clears recipients
+
+**Key validations**:
+- ✓ Accepts valid recipient formats
+- ✓ Accepts IP literals and subdomains
+- ✓ Supports multiple recipients per transaction
+- ✓ Rejects invalid email addresses
+- ✓ Enforces RCPT TO after MAIL FROM
+- ✓ RSET properly clears recipient list
+
+### ✅ CMD-04: DATA Command (`test.cmd-04.data-command.test.ts`)
+
+**Tests**: 7 total (7 passing)
+- Email data transmission after RCPT TO
+- Rejection without RCPT TO
+- Dot-stuffing handling
+- Large message support
+- Command sequence enforcement
+
+**Key validations**:
+- ✓ Accepts email data with proper terminator
+- ✓ Returns 354 to start data input
+- ✓ Returns 250 after successful email acceptance
+- ✓ Rejects DATA without MAIL FROM
+- ✓ Handles dot-stuffed content correctly
+- ✓ Supports large messages (10KB+)
+
+### ✅ CMD-13: QUIT Command (`test.cmd-13.quit-command.test.ts`)
+
+**Tests**: 7 total (7 passing)
+- Graceful connection termination
+- QUIT after MAIL FROM
+- QUIT after complete transaction
+- Idempotent QUIT handling
+- Immediate QUIT without EHLO
+
+**Key validations**:
+- ✓ Returns 221 Service closing
+- ✓ Works at any point in SMTP session
+- ✓ Properly closes connection
+- ✓ Handles multiple QUIT commands gracefully
+- ✓ Allows immediate QUIT after greeting
+
+### ✅ CM-01: TLS Connection (`test.cm-01.tls-connection.test.ts`)
+
+**Tests**: 8 total (8 passing)
+- Server advertises STARTTLS capability
+- STARTTLS command initiates upgrade
+- Direct TLS connection support
+- STARTTLS not available after already started
+- STARTTLS requires EHLO first
+- Connection accepts commands after TLS
+- Server lifecycle management
+
+**Key validations**:
+- ✓ STARTTLS advertised in EHLO capabilities
+- ✓ STARTTLS command responds with 220 Ready
+- ✓ Direct TLS connections work (with self-signed certs)
+- ✓ Second STARTTLS properly rejected
+- ✓ STARTTLS before EHLO handled correctly
+- ✓ TLS upgrade process validated
+
+### ✅ EP-01: Basic Email Sending (`test.ep-01.basic-email-sending.test.ts`)
+
+**Tests**: 7 total (7 passing)
+- Complete SMTP transaction flow (CONNECT → EHLO → MAIL FROM → RCPT TO → DATA → CONTENT → QUIT)
+- Email with MIME attachment (multipart/mixed)
+- HTML email (multipart/alternative)
+- Email with custom headers (X-Custom-Header, X-Priority, Reply-To, etc.)
+- Minimal email (body only, no headers)
+- Server lifecycle management
+
+**Key validations**:
+- ✓ Complete email lifecycle from greeting to QUIT
+- ✓ MIME multipart messages with attachments
+- ✓ HTML email with plain text fallback
+- ✓ Custom header support (X-*, Reply-To, Organization)
+- ✓ Minimal email content accepted
+- ✓ Email queuing and processing confirmed
+
 ## Running Tests
 
 ### Run All Tests
@@ -217,14 +304,14 @@ import { connectToSmtp, sendSmtpCommand } from '../../helpers/utils.ts';
 
 ## Test Priorities
 
-### Phase 1: Core SMTP Functionality (High Priority)
+### Phase 1: Core SMTP Functionality (High Priority) ✅ **COMPLETE**
 - ✅ CMD-01: EHLO Command
 - ✅ CMD-02: MAIL FROM Command
-- 🔄 CMD-03: RCPT TO Command
-- 🔄 CMD-04: DATA Command
-- 🔄 CMD-13: QUIT Command
-- 🔄 CM-01: TLS Connection
-- 🔄 EP-01: Basic Email Sending
+- ✅ CMD-03: RCPT TO Command
+- ✅ CMD-04: DATA Command
+- ✅ CMD-13: QUIT Command
+- ✅ CM-01: TLS Connection
+- ✅ EP-01: Basic Email Sending
 
 ### Phase 2: Security & Validation (High Priority)
 - 🔄 SEC-01: Authentication
@@ -252,21 +339,32 @@ import { connectToSmtp, sendSmtpCommand } from '../../helpers/utils.ts';
 ## Current Status
 
 **Infrastructure**: ✅ Complete
-- Deno-native test helpers
+- Deno-native test helpers (utils.ts, server.loader.ts, smtp.client.ts)
 - Server lifecycle management
-- SMTP protocol utilities
-- Test certificates
+- SMTP protocol utilities with readSmtpResponse helper
+- Test certificates (self-signed RSA)
 
-**Tests Ported**: 2/100+ test files
-- CMD-01: EHLO Command (5 tests passing)
-- CMD-02: MAIL FROM Command (6 tests)
+**Tests Ported**: 7/100+ test files (47 total tests passing)
+- ✅ CMD-01: EHLO Command (5 tests passing)
+- ✅ CMD-02: MAIL FROM Command (6 tests passing)
+- ✅ CMD-03: RCPT TO Command (7 tests passing)
+- ✅ CMD-04: DATA Command (7 tests passing)
+- ✅ CMD-13: QUIT Command (7 tests passing)
+- ✅ CM-01: TLS Connection (8 tests passing)
+- ✅ EP-01: Basic Email Sending (7 tests passing)
+
+**Coverage**: Complete essential SMTP transaction flow
+- EHLO → MAIL FROM → RCPT TO → DATA → QUIT ✅
+- TLS/STARTTLS support ✅
+- Complete email lifecycle (MIME, HTML, custom headers) ✅
+
+**Phase 1 Status**: ✅ **COMPLETE** (7/7 tests, 100%)
 
 **Next Steps**:
-1. Port CMD-03 (RCPT TO), CMD-04 (DATA), CMD-13 (QUIT)
-2. Port CM-01 (TLS connection test)
-3. Port EP-01 (Basic email sending)
-4. Port security tests (SEC-01, SEC-06, SEC-08)
-5. Continue with remaining high-priority tests
+1. Port CMD-06 (RSET) for transaction reset testing
+2. Port security tests (SEC-01 Authentication, SEC-06 IP Reputation, SEC-08 Rate Limiting)
+3. Port error handling tests (ERR-01 Syntax, ERR-02 Sequence)
+4. Continue with remaining high-priority tests
 
 ## Production Readiness Criteria