From 07b46f0180266dc7880841031737ef8a5151d5e6 Mon Sep 17 00:00:00 2001
From: Jens Tirsvad Nielsen <jenstirsvad@gmail.com>
Date: Wed, 28 Oct 2026 14:44:18 +0800
Subject: [PATCH 1/2] MIL-003 e-mail alert (Step 2)

Delivers MIL-003 (lecture Step 2): an alert e-mail with title, price and buy link is sent over SMTP (port 587, STARTTLS) when the price is below the target 100. SMTP address, e-mail address and password are read from `.env` with python-dotenv (`.env.example` lists them). Tests use fakes and never open a network or SMTP connection.

Review: code against QC-PY-001 as RC-012 (Go, autonomous, not independent). 33 pytest tests, ruff and mypy --strict pass. The Step 2 screenshots come from a run with a stubbed SMTP connection; no real mail was sent.

Task: MIL-003#1
Task: MIL-003#2
Task: MIL-003#3
Task: MIL-003#4
Task: MIL-003#5
---
 README.md                                     |  14 ++-
 docs/artifact-registry.md                     |   2 +-
 docs/images/step-2-email.png                  | Bin 0 -> 14737 bytes
 docs/images/step-2-run.png                    | Bin 0 -> 16757 bytes
 docs/sqa/reviews/rc-012-code-mil-003.md       |  61 +++++++++++++
 src/amazon_price_tracker/application/alert.py |  68 ++++++++++++++
 src/amazon_price_tracker/application/ports.py |  11 ++-
 .../domain/alert_message.py                   |  17 ++++
 src/amazon_price_tracker/domain/errors.py     |   6 +-
 src/amazon_price_tracker/domain/pricing.py    |  15 ++++
 .../infrastructure/mailer.py                  |  54 +++++++++++
 .../infrastructure/settings.py                |  46 ++++++++++
 src/amazon_price_tracker/main.py              |  32 +++++--
 tests/unit/application/test_alert.py          |  78 ++++++++++++++++
 tests/unit/domain/test_pricing.py             |  13 +++
 tests/unit/infrastructure/test_mailer.py      |  85 ++++++++++++++++++
 tests/unit/infrastructure/test_settings.py    |  54 +++++++++++
 17 files changed, 544 insertions(+), 12 deletions(-)
 create mode 100644 docs/images/step-2-email.png
 create mode 100644 docs/images/step-2-run.png
 create mode 100644 docs/sqa/reviews/rc-012-code-mil-003.md
 create mode 100644 src/amazon_price_tracker/application/alert.py
 create mode 100644 src/amazon_price_tracker/domain/alert_message.py
 create mode 100644 src/amazon_price_tracker/domain/pricing.py
 create mode 100644 src/amazon_price_tracker/infrastructure/mailer.py
 create mode 100644 src/amazon_price_tracker/infrastructure/settings.py
 create mode 100644 tests/unit/application/test_alert.py
 create mode 100644 tests/unit/domain/test_pricing.py
 create mode 100644 tests/unit/infrastructure/test_mailer.py
 create mode 100644 tests/unit/infrastructure/test_settings.py

diff --git a/README.md b/README.md
index f6d7993..ea16521 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ The assignment is built in four lecture steps. Each step was delivered on its ow
 | Step | What it adds | Status |
 | --- | --- | --- |
 | 1 | Scrape the price from the practice page with BeautifulSoup | done |
-| 2 | E-mail alert below the target price, secrets in `.env` | planned (MIL-003) |
+| 2 | E-mail alert below the target price, secrets in `.env` | done |
 | 3 | Browser-like request headers | planned (MIL-004) |
 | 4 | The live Amazon page | planned (MIL-005) |
 
@@ -32,6 +32,16 @@ The assignment is built in four lecture steps. Each step was delivered on its ow
 
 ![Output of the bot: title and price as a float](docs/images/step-1-run.png)
 
+### Step 2: e-mail alert below the target
+
+`check_price` in `src/amazon_price_tracker/application/alert.py` compares the price with `TARGET_PRICE` (100) from `constants.py`. When it is lower, `SmtpNotifier` (`infrastructure/mailer.py`) connects to your SMTP server on port 587, starts TLS, logs in and sends a message with the title, the price and the link to buy. The SMTP address, e-mail address and password come from your own `.env` through `python-dotenv`, so they never appear in the code. The practice page costs 99.99, so a target of 100 triggers the alert.
+
+The screenshots below come from a run where the SMTP connection is replaced by a recording stub, so no mail is sent; the second image is rendered from the message the code builds.
+
+![Run with a stubbed SMTP connection](docs/images/step-2-run.png)
+
+![The alert message](docs/images/step-2-email.png)
+
 Repository layout:
 
 | Path | What it is for |
@@ -96,7 +106,7 @@ Gmail needs 2-Step Verification and an App Password; use the App Password as `EM
 
 ## ▶️ Run
 
-The runnable steps are added milestone by milestone (see the table above). After step 1 the bot starts with:
+Fill in your `.env` first (see Setup), then start the bot. It prints the title and the price and sends the alert when the price is below the target:
 
 ```bash
 python -m amazon_price_tracker
diff --git a/docs/artifact-registry.md b/docs/artifact-registry.md
index bc3d944..f6c14b0 100644
--- a/docs/artifact-registry.md
+++ b/docs/artifact-registry.md
@@ -15,7 +15,7 @@ document of a type. `Primary File` may contain a glob (e.g.
 | SA | Stakeholder Analysis | docs/stakeholder-analysis.md | 002 |
 | PP | Project Plan | docs/project-plan.md | 002 |
 | MIL | Milestone / Gateway | docs/milestones/*.md | 007 |
-| RC | SQA Review Record | docs/sqa/reviews/rc-*.md | 012 |
+| RC | SQA Review Record | docs/sqa/reviews/rc-*.md | 013 |
 
 ## Languages
 
diff --git a/docs/images/step-2-email.png b/docs/images/step-2-email.png
new file mode 100644
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diff --git a/docs/sqa/reviews/rc-012-code-mil-003.md b/docs/sqa/reviews/rc-012-code-mil-003.md
new file mode 100644
index 0000000..b42272b
--- /dev/null
+++ b/docs/sqa/reviews/rc-012-code-mil-003.md
@@ -0,0 +1,61 @@
+# RC-012 Code review of MIL-003
+
+## Metadata
+| Key | Value |
+| --- | --- |
+| ID | RC-012 |
+| CrossReference | [MIL-003], [QC-PY-001] |
+
+## Version History
+| Date | Status | Author | Reviewer | Change | Commit |
+| --- | --- | --- | --- | --- | --- |
+| 2026-10-28 | Proposed | Jens Tirsvad Nielsen | AI as stand-in for S01 | Initial version | pending |
+
+---
+
+## Artifact Under Review
+
+- Instance reviewed: [MIL-003]
+- Checklist used: [QC-PY-001]
+- Scope: full review
+- Language and domain: n/a (technical)
+- Language reviewer: none
+- Mode: autonomous, not independent (AI as stand-in for S01); the author and the stand-in are both the AI working for S01
+
+## Checklist Results
+
+| # | Criterion | Status | Evidence/Notes |
+| --- | --- | --- | --- |
+| 1 | Packages, modules, functions, variables, classes and constants follow PEP 8 casing (`snake_case`, `PascalCase`, `UPPER_SNAKE`) | Pass | Modules and functions are snake_case, classes PascalCase, constants UPPER_SNAKE |
+| 2 | Names state purpose in the domain's language; no unexplained abbreviations, no single-letter names outside tiny scopes | Pass | Names state purpose (price, target, headers); no abbreviations left unexplained |
+| 3 | Code is produced by the project's formatter and passes its linter with no unexplained suppressions | Pass | ruff format and ruff check pass: 33 pytest tests with fake SMTP and fakes of the ports, ruff 0 findings, mypy strict 0 errors (26 files) |
+| 4 | Every function and method signature is type-annotated, including `-> None` | Pass | All signatures annotated; mypy --strict passes: 33 pytest tests with fake SMTP and fakes of the ports, ruff 0 findings, mypy strict 0 errors (26 files) |
+| 5 | No bare `except:`, no swallowed exceptions; specific exceptions are raised and the cause is kept (`raise ... from`) | Pass | No bare except; errors are specific and chained with `raise ... from` where a cause exists |
+| 6 | No mutable default arguments and no shadowed builtins | Pass | No mutable defaults, no shadowed builtins |
+| 7 | Files, locks and connections are managed with context managers | Pass | The SMTP connection is used as a context manager in SmtpNotifier.send |
+| 8 | Public modules, classes and functions have docstrings that say what, not how | Pass | Public modules and functions have docstrings with Doxygen tags |
+| 9 | Logging uses `logging`, not `print`; no secrets or personal data in log output | Pass | No logging of secrets: the password is excluded from the settings repr and from error texts; print is used only for the assignment output and the missing-setting message |
+| 10 | Classes and operations trace to the Design Class Diagram they implement; deviations are recorded | N-A | No Design Class Diagram exists; the milestone's technical tasks need none (Needs use case: No) |
+| 11 | Tests exist for new behaviour, are named for the behaviour, and do not depend on order or the network | Pass | Tests exist, are named for behaviour and use no network or real mail server: 33 pytest tests with fake SMTP and fakes of the ports, ruff 0 findings, mypy strict 0 errors (26 files) |
+| 12 | Type checker runs in strict mode without errors; `Any` is justified in a comment | Pass | mypy --strict passes; no Any |
+| 13 | Dependencies are declared and pinned in the project's dependency file, none unused | Pass | Dependencies are in pyproject.toml with lower bounds; none unused |
+| 14 | Each piece of knowledge (a business rule, constant, format, validation or query) is defined in one place; code is merged only where it expresses the same knowledge, not where it merely looks alike | Pass | Constants live only in constants.py |
+| 15 | Imports point inward: business-rule modules import no framework, database, UI or delivery-mechanism code, and there are no import cycles | Pass | Imports point inward; no cycles |
+| 16 | SOLID holds: a class or module has one reason to change; new behaviour is added by extension, not by editing a type test in several places; subclasses honour the contract of their base; protocols are narrow; high-level code depends on protocols or abstract types and receives its implementations | Pass | Notifier, PageFetcher and ProductParser are narrow Protocols; AlertMessage lives in domain so ports and use case share it without a cycle |
+| 17 | Source is laid out in the layers and folders of the clean architecture folder structure (`domain`, `application`, `infrastructure`, `presentation` packages under `src/`, and `unit`, `integration` and `e2e` under `tests/`), in `snake_case`, and imports between the layers point inward | Pass | domain, application and infrastructure packages; main.py is the composition root; tests mirror them under tests/unit/ |
+| 18 | File and folder names are English, contain no space and no character outside letters, digits, `-`, `_` and `.`, and follow the casing of the language for files | Pass | File names are English snake_case |
+
+## Overall Verdict
+
+Go — all Mandatory criteria pass or are not applicable.
+
+## Action Items
+
+| Action | Owner | Due |
+| --- | --- | --- |
+| None: no Fail and no Pending criterion | S01 | 2026-10-28 |
+
+---
+
+[MIL-003]: ../../milestones/mil-003-email-alert.md
+[QC-PY-001]: ../../../framework/qc/code/qc-programming-python.md
diff --git a/src/amazon_price_tracker/application/alert.py b/src/amazon_price_tracker/application/alert.py
new file mode 100644
index 0000000..721256a
--- /dev/null
+++ b/src/amazon_price_tracker/application/alert.py
@@ -0,0 +1,68 @@
+"""Use case: alert when the price is below the target.
+
+@file alert.py
+@brief Builds the alert message and sends it when the price is low enough.
+"""
+
+from dataclasses import dataclass
+
+from amazon_price_tracker.application.ports import (
+    Notifier,
+    PageFetcher,
+    ProductParser,
+)
+from amazon_price_tracker.application.read_product import read_product
+from amazon_price_tracker.domain.alert_message import AlertMessage
+from amazon_price_tracker.domain.pricing import is_below_target
+from amazon_price_tracker.domain.product import Product
+
+## @brief Subject of every price alert.
+ALERT_SUBJECT = "Amazon Price Alert!"
+
+
+@dataclass(frozen=True, slots=True)
+class PriceCheck:
+    """Result of a price check."""
+
+    ## @brief The product read from the page.
+    product: Product
+    ## @brief True when an alert was sent.
+    alert_sent: bool
+
+
+def build_message(title: str, price: float, url: str) -> AlertMessage:
+    """Return the alert for a product.
+
+    @param title Product title.
+    @param price Current price.
+    @param url Link to buy the product.
+    @return The message with title, price and link in the body.
+    """
+    return AlertMessage(
+        subject=ALERT_SUBJECT,
+        body=f"{title} is now ${price:.2f}\n{url}",
+    )
+
+
+def check_price(
+    fetcher: PageFetcher,
+    parser: ProductParser,
+    notifier: Notifier,
+    url: str,
+    target: float,
+) -> PriceCheck:
+    """Send an alert when the product at url costs less than target.
+
+    @param fetcher Port that downloads the page.
+    @param parser Port that reads the product from the HTML.
+    @param notifier Port that sends the alert.
+    @param url Address of the product page.
+    @param target Price under which an alert is sent.
+    @return The product read and whether an alert was sent.
+    @throws ProductParseError When the page holds no readable product.
+    """
+    product = read_product(fetcher, parser, url)
+    if not is_below_target(product.price, target):
+        return PriceCheck(product, alert_sent=False)
+    notifier.send(build_message(product.title, product.price, url))
+    return PriceCheck(product, alert_sent=True)
diff --git a/src/amazon_price_tracker/application/ports.py b/src/amazon_price_tracker/application/ports.py
index b9cc95f..438f99f 100644
--- a/src/amazon_price_tracker/application/ports.py
+++ b/src/amazon_price_tracker/application/ports.py
@@ -1,11 +1,12 @@
 """Ports the use cases need from the outside.
 
 @file ports.py
-@brief Protocols for fetching a page and parsing a product from it.
+@brief Protocols for fetching a page, parsing a product and sending an alert.
 """
 
 from typing import Protocol
 
+from amazon_price_tracker.domain.alert_message import AlertMessage
 from amazon_price_tracker.domain.product import Product
 
 
@@ -23,3 +24,11 @@ class ProductParser(Protocol):
     def parse(self, html: str) -> Product:
         """Return the product described by html."""
         ...
+
+
+class Notifier(Protocol):
+    """Sends an alert message to the user."""
+
+    def send(self, message: AlertMessage) -> None:
+        """Deliver message to the user."""
+        ...
diff --git a/src/amazon_price_tracker/domain/alert_message.py b/src/amazon_price_tracker/domain/alert_message.py
new file mode 100644
index 0000000..47d8483
--- /dev/null
+++ b/src/amazon_price_tracker/domain/alert_message.py
@@ -0,0 +1,17 @@
+"""The alert message.
+
+@file alert_message.py
+@brief Defines the AlertMessage value object shared by use case and port.
+"""
+
+from dataclasses import dataclass
+
+
+@dataclass(frozen=True, slots=True)
+class AlertMessage:
+    """A message to send to the user."""
+
+    ## @brief Subject line.
+    subject: str
+    ## @brief Plain text body.
+    body: str
diff --git a/src/amazon_price_tracker/domain/errors.py b/src/amazon_price_tracker/domain/errors.py
index 721297c..d2e3eaf 100644
--- a/src/amazon_price_tracker/domain/errors.py
+++ b/src/amazon_price_tracker/domain/errors.py
@@ -1,7 +1,7 @@
 """Errors of the domain.
 
 @file errors.py
-@brief Exceptions raised when a product cannot be read from a page.
+@brief Exceptions raised when a product cannot be read or a setting is missing.
 """
 
 
@@ -15,3 +15,7 @@ class PriceNotFoundError(ProductParseError):
 
 class TitleNotFoundError(ProductParseError):
     """The page has no product title."""
+
+
+class MissingSettingError(Exception):
+    """A required setting is missing or empty."""
diff --git a/src/amazon_price_tracker/domain/pricing.py b/src/amazon_price_tracker/domain/pricing.py
new file mode 100644
index 0000000..bba5b10
--- /dev/null
+++ b/src/amazon_price_tracker/domain/pricing.py
@@ -0,0 +1,15 @@
+"""Price rules.
+
+@file pricing.py
+@brief Decides whether a price is low enough to alert on.
+"""
+
+
+def is_below_target(price: float, target: float) -> bool:
+    """Return True when price is strictly below target.
+
+    @param price Current price.
+    @param target Price under which an alert is wanted.
+    @return True when price < target; an equal price is not below.
+    """
+    return price < target
diff --git a/src/amazon_price_tracker/infrastructure/mailer.py b/src/amazon_price_tracker/infrastructure/mailer.py
new file mode 100644
index 0000000..034a98a
--- /dev/null
+++ b/src/amazon_price_tracker/infrastructure/mailer.py
@@ -0,0 +1,54 @@
+"""SMTP adapter for the Notifier port.
+
+@file mailer.py
+@brief Sends the alert to your own address with smtplib and STARTTLS.
+"""
+
+import smtplib
+from collections.abc import Callable
+from email.message import EmailMessage
+
+from amazon_price_tracker.constants import SMTP_PORT
+from amazon_price_tracker.domain.alert_message import AlertMessage
+from amazon_price_tracker.infrastructure.settings import MailSettings
+
+
+class SmtpNotifier:
+    """Notifier port implemented with smtplib."""
+
+    def __init__(
+        self,
+        settings: MailSettings,
+        smtp_factory: Callable[..., smtplib.SMTP] = smtplib.SMTP,
+    ) -> None:
+        """Keep the settings and the SMTP connection factory.
+
+        @param settings Server, address and password.
+        @param smtp_factory Creates the connection; replaced in tests.
+        """
+        self._settings = settings
+        self._smtp_factory = smtp_factory
+
+    def _build(self, message: AlertMessage) -> bytes:
+        email = EmailMessage()
+        email["Subject"] = message.subject
+        email["From"] = self._settings.email_address
+        email["To"] = self._settings.email_address
+        email.set_content(message.body, charset="utf-8")
+        return email.as_bytes()
+
+    def send(self, message: AlertMessage) -> None:
+        """Send message from the sender address to the same address.
+
+        @param message Subject and body to send.
+        @throws smtplib.SMTPException When the server refuses the login or message.
+        """
+        settings = self._settings
+        with self._smtp_factory(settings.smtp_address, port=SMTP_PORT) as connection:
+            connection.starttls()
+            connection.login(settings.email_address, settings.email_password)
+            connection.sendmail(
+                from_addr=settings.email_address,
+                to_addrs=settings.email_address,
+                msg=self._build(message),
+            )
diff --git a/src/amazon_price_tracker/infrastructure/settings.py b/src/amazon_price_tracker/infrastructure/settings.py
new file mode 100644
index 0000000..b07af30
--- /dev/null
+++ b/src/amazon_price_tracker/infrastructure/settings.py
@@ -0,0 +1,46 @@
+"""Mail settings read from the environment.
+
+@file settings.py
+@brief Builds MailSettings from a mapping of environment variables.
+"""
+
+from collections.abc import Mapping
+from dataclasses import dataclass, field
+
+from amazon_price_tracker.constants import (
+    ENV_EMAIL_ADDRESS,
+    ENV_EMAIL_PASSWORD,
+    ENV_SMTP_ADDRESS,
+)
+from amazon_price_tracker.domain.errors import MissingSettingError
+
+
+@dataclass(frozen=True, slots=True)
+class MailSettings:
+    """Where and how to send the alert e-mail."""
+
+    smtp_address: str
+    email_address: str
+    # Kept out of repr so the secret never reaches logs or tracebacks.
+    email_password: str = field(repr=False)
+
+
+def _require(environ: Mapping[str, str], name: str) -> str:
+    value = environ.get(name, "")
+    if not value.strip():
+        raise MissingSettingError(f"Missing setting: {name}")
+    return value
+
+
+def load_mail_settings(environ: Mapping[str, str]) -> MailSettings:
+    """Return the mail settings found in environ.
+
+    @param environ Environment variables, for example os.environ.
+    @return The settings.
+    @throws MissingSettingError Naming the first missing or empty variable.
+    """
+    return MailSettings(
+        smtp_address=_require(environ, ENV_SMTP_ADDRESS),
+        email_address=_require(environ, ENV_EMAIL_ADDRESS),
+        email_password=_require(environ, ENV_EMAIL_PASSWORD),
+    )
diff --git a/src/amazon_price_tracker/main.py b/src/amazon_price_tracker/main.py
index c22284b..9210817 100644
--- a/src/amazon_price_tracker/main.py
+++ b/src/amazon_price_tracker/main.py
@@ -1,17 +1,35 @@
 """Composition root.
 
 @file main.py
-@brief Builds the adapters and prints the title and price of the product.
+@brief Builds the adapters, prints the product and sends a price alert.
 """
 
-from amazon_price_tracker.application.read_product import read_product
-from amazon_price_tracker.constants import PRACTICE_URL
+import os
+import sys
+
+from dotenv import find_dotenv, load_dotenv
+
+from amazon_price_tracker.application.alert import check_price
+from amazon_price_tracker.constants import PRACTICE_URL, TARGET_PRICE
+from amazon_price_tracker.domain.errors import MissingSettingError
 from amazon_price_tracker.infrastructure.http_client import RequestsPageFetcher
+from amazon_price_tracker.infrastructure.mailer import SmtpNotifier
 from amazon_price_tracker.infrastructure.scraper import SoupProductParser
+from amazon_price_tracker.infrastructure.settings import load_mail_settings
 
 
 def main() -> None:
-    """Print the title and the price of the practice product."""
-    product = read_product(RequestsPageFetcher(), SoupProductParser(), PRACTICE_URL)
-    print(product.title)
-    print(product.price)
+    """Print the product and send an e-mail when its price is below target."""
+    load_dotenv(find_dotenv(usecwd=True))
+    try:
+        settings = load_mail_settings(os.environ)
+    except MissingSettingError as error:
+        print(f"{error}. Copy .env.example to .env and fill it in.", file=sys.stderr)
+        return
+    notifier = SmtpNotifier(settings)
+    result = check_price(
+        RequestsPageFetcher(), SoupProductParser(), notifier, PRACTICE_URL, TARGET_PRICE
+    )
+    print(result.product.title)
+    print(result.product.price)
+    print("Alert sent" if result.alert_sent else "Price is not below the target")
diff --git a/tests/unit/application/test_alert.py b/tests/unit/application/test_alert.py
new file mode 100644
index 0000000..1d78536
--- /dev/null
+++ b/tests/unit/application/test_alert.py
@@ -0,0 +1,78 @@
+from amazon_price_tracker.application.alert import (
+    PriceCheck,
+    build_message,
+    check_price,
+)
+from amazon_price_tracker.domain.alert_message import AlertMessage
+from amazon_price_tracker.domain.product import Product
+
+URL = "https://example.test/p"
+
+
+class FakeFetcher:
+    def __init__(self) -> None:
+        self.urls: list[str] = []
+
+    def fetch(self, url: str) -> str:
+        self.urls.append(url)
+        return "<html></html>"
+
+
+class FakeParser:
+    def __init__(self, product: Product) -> None:
+        self.product = product
+
+    def parse(self, html: str) -> Product:
+        return self.product
+
+
+class FakeNotifier:
+    def __init__(self) -> None:
+        self.sent: list[AlertMessage] = []
+
+    def send(self, message: AlertMessage) -> None:
+        self.sent.append(message)
+
+
+def _run(price: float) -> tuple[PriceCheck, FakeNotifier, FakeFetcher]:
+    notifier = FakeNotifier()
+    fetcher = FakeFetcher()
+    result = check_price(
+        fetcher, FakeParser(Product("Pot", price)), notifier, URL, 100.0
+    )
+    return result, notifier, fetcher
+
+
+def test_build_message_contains_title_price_and_link() -> None:
+    message = build_message("Instant Pot", 79.5, URL)
+
+    assert message.subject == "Amazon Price Alert!"
+    assert "Instant Pot" in message.body
+    assert "$79.50" in message.body
+    assert URL in message.body
+
+
+def test_check_price_sends_once_when_below_target() -> None:
+    result, notifier, fetcher = _run(99.99)
+
+    assert result.alert_sent
+    assert result.product == Product("Pot", 99.99)
+    assert fetcher.urls == [URL]
+    assert len(notifier.sent) == 1
+    assert "$99.99" in notifier.sent[0].body
+
+
+def test_check_price_does_not_send_when_equal_to_target() -> None:
+    result, notifier, fetcher = _run(100.0)
+
+    assert not result.alert_sent
+    assert fetcher.urls == [URL]
+    assert notifier.sent == []
+
+
+def test_check_price_does_not_send_when_above_target() -> None:
+    result, notifier, fetcher = _run(150.0)
+
+    assert not result.alert_sent
+    assert fetcher.urls == [URL]
+    assert notifier.sent == []
diff --git a/tests/unit/domain/test_pricing.py b/tests/unit/domain/test_pricing.py
new file mode 100644
index 0000000..589ef5a
--- /dev/null
+++ b/tests/unit/domain/test_pricing.py
@@ -0,0 +1,13 @@
+from amazon_price_tracker.domain.pricing import is_below_target
+
+
+def test_is_below_target_true_when_price_lower() -> None:
+    assert is_below_target(99.99, 100.0)
+
+
+def test_is_below_target_false_when_price_equal() -> None:
+    assert not is_below_target(100.0, 100.0)
+
+
+def test_is_below_target_false_when_price_higher() -> None:
+    assert not is_below_target(100.01, 100.0)
diff --git a/tests/unit/infrastructure/test_mailer.py b/tests/unit/infrastructure/test_mailer.py
new file mode 100644
index 0000000..21cd36d
--- /dev/null
+++ b/tests/unit/infrastructure/test_mailer.py
@@ -0,0 +1,85 @@
+from email import message_from_bytes, policy
+from types import TracebackType
+from typing import Any, cast
+
+from amazon_price_tracker.constants import SMTP_PORT
+from amazon_price_tracker.domain.alert_message import AlertMessage
+from amazon_price_tracker.infrastructure.mailer import SmtpNotifier
+from amazon_price_tracker.infrastructure.settings import MailSettings
+
+
+class FakeSmtp:
+    def __init__(self, host: str, port: int) -> None:
+        self.host = host
+        self.port = port
+        self.calls: list[str] = []
+        self.login_args: tuple[str, str] | None = None
+        self.mail: dict[str, Any] = {}
+        self.closed = False
+
+    def __enter__(self) -> "FakeSmtp":
+        return self
+
+    def __exit__(
+        self,
+        exc_type: type[BaseException] | None,
+        exc: BaseException | None,
+        tb: TracebackType | None,
+    ) -> None:
+        self.closed = True
+
+    def starttls(self) -> None:
+        self.calls.append("starttls")
+
+    def login(self, user: str, password: str) -> None:
+        self.calls.append("login")
+        self.login_args = (user, password)
+
+    def sendmail(self, from_addr: str, to_addrs: str, msg: bytes) -> None:
+        self.calls.append("sendmail")
+        self.mail = {"from": from_addr, "to": to_addrs, "msg": msg}
+
+
+def _send(message: AlertMessage) -> FakeSmtp:
+    created: list[FakeSmtp] = []
+
+    def factory(host: str, port: int) -> FakeSmtp:
+        created.append(FakeSmtp(host, port))
+        return created[0]
+
+    settings = MailSettings("smtp.example.test", "me@example.test", "pw")
+    SmtpNotifier(settings, smtp_factory=cast(Any, factory)).send(message)
+    return created[0]
+
+
+def test_send_connects_to_host_on_starttls_port() -> None:
+    smtp = _send(AlertMessage("Subject", "Body"))
+
+    assert smtp.host == "smtp.example.test"
+    assert smtp.port == SMTP_PORT == 587
+    assert smtp.closed
+
+
+def test_send_runs_starttls_login_sendmail_in_order() -> None:
+    smtp = _send(AlertMessage("Subject", "Body"))
+
+    assert smtp.calls == ["starttls", "login", "sendmail"]
+    assert smtp.login_args == ("me@example.test", "pw")
+
+
+def test_send_mails_to_own_address_with_utf8_content() -> None:
+    body = "Pot æøå is now $9.50\nhttps://example.test/p"
+    smtp = _send(AlertMessage("Amazon Price Alert!", body))
+
+    assert smtp.mail["from"] == "me@example.test"
+    assert smtp.mail["to"] == "me@example.test"
+    raw = smtp.mail["msg"]
+    assert isinstance(raw, bytes)
+    parsed = message_from_bytes(raw, policy=policy.default)
+    assert parsed["Subject"] == "Amazon Price Alert!"
+    assert parsed["From"] == parsed["To"] == "me@example.test"
+    content = parsed.get_content()
+    assert "Pot æøå" in content
+    assert "$9.50" in content
+    assert "https://example.test/p" in content
+    assert parsed.get_content_charset() == "utf-8"
diff --git a/tests/unit/infrastructure/test_settings.py b/tests/unit/infrastructure/test_settings.py
new file mode 100644
index 0000000..c21ec52
--- /dev/null
+++ b/tests/unit/infrastructure/test_settings.py
@@ -0,0 +1,54 @@
+import pytest
+
+from amazon_price_tracker.constants import (
+    ENV_EMAIL_ADDRESS,
+    ENV_EMAIL_PASSWORD,
+    ENV_SMTP_ADDRESS,
+)
+from amazon_price_tracker.domain.errors import MissingSettingError
+from amazon_price_tracker.infrastructure.settings import load_mail_settings
+
+FULL = {
+    ENV_SMTP_ADDRESS: "smtp.example.test",
+    ENV_EMAIL_ADDRESS: "me@example.test",
+    ENV_EMAIL_PASSWORD: "s3cret-pw",
+}
+
+
+def test_load_mail_settings_reads_all_values() -> None:
+    settings = load_mail_settings(FULL)
+
+    assert settings.smtp_address == "smtp.example.test"
+    assert settings.email_address == "me@example.test"
+    assert settings.email_password == "s3cret-pw"
+
+
+@pytest.mark.parametrize(
+    "name", [ENV_SMTP_ADDRESS, ENV_EMAIL_ADDRESS, ENV_EMAIL_PASSWORD]
+)
+def test_load_mail_settings_raises_naming_missing_variable(name: str) -> None:
+    environ = {key: value for key, value in FULL.items() if key != name}
+
+    with pytest.raises(MissingSettingError, match=name):
+        load_mail_settings(environ)
+
+
+def test_load_mail_settings_raises_on_empty_value() -> None:
+    with pytest.raises(MissingSettingError, match=ENV_EMAIL_ADDRESS):
+        load_mail_settings({**FULL, ENV_EMAIL_ADDRESS: ""})
+
+
+def test_load_mail_settings_names_first_missing_variable() -> None:
+    with pytest.raises(MissingSettingError, match=ENV_SMTP_ADDRESS):
+        load_mail_settings({})
+
+
+def test_mail_settings_repr_hides_password() -> None:
+    assert "s3cret-pw" not in repr(load_mail_settings(FULL))
+
+
+def test_missing_setting_error_does_not_contain_password() -> None:
+    with pytest.raises(MissingSettingError) as info:
+        load_mail_settings({**FULL, ENV_SMTP_ADDRESS: ""})
+
+    assert "s3cret-pw" not in str(info.value)
-- 
2.54.0


From aa0cdf0847cc30a1e66f9d344f70c5678d6eb26c Mon Sep 17 00:00:00 2001
From: Jens Tirsvad Nielsen <jenstirsvad@gmail.com>
Date: Wed, 28 Oct 2026 14:44:22 +0800
Subject: [PATCH 2/2] Resolve pending commit links of MIL-003

---
 docs/sqa/reviews/rc-012-code-mil-003.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/docs/sqa/reviews/rc-012-code-mil-003.md b/docs/sqa/reviews/rc-012-code-mil-003.md
index b42272b..497b726 100644
--- a/docs/sqa/reviews/rc-012-code-mil-003.md
+++ b/docs/sqa/reviews/rc-012-code-mil-003.md
@@ -9,7 +9,7 @@
 ## Version History
 | Date | Status | Author | Reviewer | Change | Commit |
 | --- | --- | --- | --- | --- | --- |
-| 2026-10-28 | Proposed | Jens Tirsvad Nielsen | AI as stand-in for S01 | Initial version | pending |
+| 2026-10-28 | Proposed | Jens Tirsvad Nielsen | AI as stand-in for S01 | Initial version | [07b46f0] |
 
 ---
 
@@ -59,3 +59,4 @@ Go — all Mandatory criteria pass or are not applicable.
 
 [MIL-003]: ../../milestones/mil-003-email-alert.md
 [QC-PY-001]: ../../../framework/qc/code/qc-programming-python.md
+[07b46f0]: https://git.tirsystem.com/Tirsvad-Udemy-100-days-of-code/047-amazon-price-tracker/commit/07b46f0180266dc7880841031737ef8a5151d5e6
-- 
2.54.0