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+"""Unit tests for email service.
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+
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+These tests verify email template rendering and HTML formatting.
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+"""
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+
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+from unittest.mock import AsyncMock, patch
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+
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+import pytest
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+from sqlalchemy.ext.asyncio import AsyncSession
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+
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+from backend.app.models.notification_template import NotificationTemplate
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+from backend.app.services.email_service import (
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+ create_password_reset_email_from_template,
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+ create_welcome_email_from_template,
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+)
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+
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+
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+class TestEmailTemplateFormatting:
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+ """Tests for email template formatting."""
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+
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+ @pytest.mark.asyncio
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+ async def test_welcome_email_newlines_converted_to_br(self):
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+ """Verify that newlines in welcome email body are converted to <br> tags."""
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+ # Mock database session
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+ db = AsyncMock(spec=AsyncSession)
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+
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+ # Mock template with newlines
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+ template = NotificationTemplate(
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+ event_type="user_created",
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+ name="Welcome Email",
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+ title_template="Welcome to {app_name}",
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+ body_template="Hello {username}!\n\nYour password is: {password}\n\nPlease login at: {login_url}",
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+ is_default=True,
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+ )
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+
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+ # Patch get_notification_template to return our template
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+ with patch("backend.app.services.email_service.get_notification_template", return_value=template):
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+ # Generate email
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+ subject, text_body, html_body = await create_welcome_email_from_template(
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+ db=db,
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+ username="testuser",
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+ password="testpass123",
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+ login_url="http://example.com/login",
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+ app_name="TestApp",
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+ )
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+
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+ # Verify subject
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+ assert subject == "Welcome to TestApp"
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+
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+ # Verify text body has newlines
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+ assert "\n\n" in text_body
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+ assert "Hello testuser!" in text_body
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+ assert "Your password is: testpass123" in text_body
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+
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+ # Verify HTML body has <br> tags instead of relying on CSS
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+ assert "<br>" in html_body
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+ # Should not use white-space: pre-wrap
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+ assert "white-space: pre-wrap" not in html_body
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+ # Should have proper structure
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+ assert "<!DOCTYPE html>" in html_body
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+ assert '<div style="font-size: 16px;">' in html_body
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+
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+ # Verify that escaped content is present (XSS protection)
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+ assert "Hello testuser!<br>" in html_body
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+ assert "Your password is: testpass123<br>" in html_body
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+
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+ @pytest.mark.asyncio
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+ async def test_password_reset_email_newlines_converted_to_br(self):
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+ """Verify that newlines in password reset email body are converted to <br> tags."""
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+ # Mock database session
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+ db = AsyncMock(spec=AsyncSession)
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+
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+ # Mock template with newlines
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+ template = NotificationTemplate(
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+ event_type="password_reset",
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+ name="Password Reset",
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+ title_template="{app_name} - Password Reset",
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+ body_template="Hello {username},\n\nYour password has been reset.\nNew password: {password}\n\nLogin at: {login_url}",
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+ is_default=True,
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+ )
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+
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+ # Patch get_notification_template to return our template
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+ with patch("backend.app.services.email_service.get_notification_template", return_value=template):
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+ # Generate email
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+ subject, text_body, html_body = await create_password_reset_email_from_template(
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+ db=db,
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+ username="testuser",
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+ password="newpass456",
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+ login_url="http://example.com/login",
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+ app_name="TestApp",
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+ )
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+
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+ # Verify subject
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+ assert subject == "TestApp - Password Reset"
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+
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+ # Verify text body has newlines
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+ assert "\n\n" in text_body
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+ assert "Hello testuser," in text_body
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+
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+ # Verify HTML body has <br> tags
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+ assert "<br>" in html_body
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+ # Should not use white-space: pre-wrap
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+ assert "white-space: pre-wrap" not in html_body
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+ # Should have security alert
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+ assert "Security Alert" in html_body
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+
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+ @pytest.mark.asyncio
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+ async def test_email_header_padding(self):
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+ """Verify that email header has proper padding to prevent cutoff."""
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+ # Mock database session
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+ db = AsyncMock(spec=AsyncSession)
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+
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+ # Mock template
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+ template = NotificationTemplate(
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+ event_type="user_created",
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+ name="Welcome Email",
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+ title_template="Welcome",
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+ body_template="Test body",
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+ is_default=True,
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+ )
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+
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+ # Patch get_notification_template to return our template
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+ with patch("backend.app.services.email_service.get_notification_template", return_value=template):
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+ # Generate email
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+ subject, text_body, html_body = await create_welcome_email_from_template(
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+ db=db,
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+ username="testuser",
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+ password="testpass123",
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+ login_url="http://example.com/login",
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+ )
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+
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+ # Verify header has 30px padding (not 20px which was cutting off)
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+ assert "padding: 30px; border-radius: 8px 8px 0 0;" in html_body
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+
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+ @pytest.mark.asyncio
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+ async def test_email_xss_protection(self):
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+ """Verify that HTML escaping is applied to prevent XSS attacks."""
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+ # Mock database session
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+ db = AsyncMock(spec=AsyncSession)
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+
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+ # Mock template with potential XSS content
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+ template = NotificationTemplate(
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+ event_type="user_created",
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+ name="Welcome Email",
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+ title_template="Welcome <script>alert('xss')</script>",
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+ body_template="Hello <script>alert('xss')</script>\nTest",
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+ is_default=True,
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+ )
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+
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+ # Patch get_notification_template to return our template
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+ with patch("backend.app.services.email_service.get_notification_template", return_value=template):
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+ # Generate email
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+ subject, text_body, html_body = await create_welcome_email_from_template(
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+ db=db,
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+ username="testuser",
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+ password="testpass123",
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+ login_url="http://example.com/login",
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+ )
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+
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+ # Verify that script tags are escaped
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+ assert "<script>" in html_body
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+ assert "<script>" not in html_body or html_body.count("<script>") == 0 # No unescaped script tags
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