diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
new file mode 100644
index 0000000..3c54133
--- /dev/null
+++ b/.gitea/workflows/ci.yml
@@ -0,0 +1,147 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build-and-scan:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v7
+        with:
+          fetch-depth: 0
+          persist-credentials: false
+
+      - name: Build image
+        run: docker build -t nvidia-stock-bot:ci .
+
+      - name: Smoke test (syntax check)
+        run: |
+          docker run --rm --entrypoint python nvidia-stock-bot:ci -c "
+          import ast, glob
+          for f in glob.glob('/app/*.py'):
+              ast.parse(open(f).read(), filename=f)
+          print('syntax OK')
+          "
+
+      - name: Build test image
+        run: docker build --target test -t nvidia-stock-bot:test .
+
+      - name: Run unit tests
+        run: docker run --rm nvidia-stock-bot:test pytest -v
+
+      - name: Check deprecation warnings
+        run: |
+          docker run --rm --entrypoint python \
+            -e DISCORD_WEBHOOK_URL="https://discord.com/api/webhooks/123456789012345678/abcdef" \
+            -e PRODUCT_NAMES="RTX 5090 Founders Edition" \
+            -e TEST_MODE=True \
+            nvidia-stock-bot:ci -W error::DeprecationWarning -c "import main"
+
+      - name: Trivy scan (critical, blocking)
+        run: |
+          docker run --rm \
+            -e DOCKER_HOST=tcp://dockerhost:2375 --add-host=dockerhost:host-gateway \
+            aquasec/trivy image --severity CRITICAL --exit-code 1 --ignore-unfixed nvidia-stock-bot:ci
+
+      - name: Trivy scan (high, informative)
+        run: |
+          docker run --rm \
+            -e DOCKER_HOST=tcp://dockerhost:2375 --add-host=dockerhost:host-gateway \
+            aquasec/trivy image --severity HIGH --exit-code 0 --ignore-unfixed nvidia-stock-bot:ci
+
+      - name: Version bump, publish image and create release
+        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+        env:
+          CI_PUSH_TOKEN: ${{ secrets.CI_PUSH_TOKEN }}
+          REGISTRY_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
+        run: |
+          IMAGE="git.djeex.fr/djeex/nvidia-stock-bot"
+          REPO_API="https://git.djeex.fr/api/v1/repos/Djeex/nvidia-stock-bot"
+          REPO_URL="https://git.djeex.fr/Djeex/nvidia-stock-bot"
+
+          # actions/checkout with persist-credentials:false shouldn't leave a
+          # credential header behind, but unset it defensively anyway so it
+          # can never silently shadow the token used for the push below.
+          git config --unset-all "http.${REPO_URL}.git/.extraheader" || true
+          git config --unset-all "http.${REPO_URL}/.extraheader" || true
+
+          BASE_SHA="${{ github.event.before }}"
+          if [ -z "$BASE_SHA" ] || ! git cat-file -e "$BASE_SHA" 2>/dev/null; then
+            BASE_SHA="HEAD~1"
+          fi
+          CHANGED_FILES=$(git diff --name-only "$BASE_SHA" "${{ github.sha }}" 2>/dev/null || git diff --name-only HEAD~1 HEAD 2>/dev/null || true)
+          echo "Changed files:"
+          echo "$CHANGED_FILES"
+
+          RELEVANT=false
+          if echo "$CHANGED_FILES" | grep -qE '^(Dockerfile|VERSION)$|^app/'; then
+            RELEVANT=true
+          fi
+
+          VERSION_CHANGED=false
+          if echo "$CHANGED_FILES" | grep -qx "VERSION"; then
+            VERSION_CHANGED=true
+          fi
+
+          CURRENT_VERSION=$(cat VERSION)
+
+          if [ "$RELEVANT" = "true" ] && [ "$VERSION_CHANGED" = "false" ]; then
+            IFS='.' read -r MAJOR MINOR PATCH <<< "$CURRENT_VERSION"
+            PATCH=$((PATCH + 1))
+            NEW_VERSION="${MAJOR}.${MINOR}.${PATCH}"
+            echo "$NEW_VERSION" > VERSION
+            git config user.name "gitea-ci-bot"
+            git config user.email "ci-bot@git.djeex.fr"
+            git add VERSION
+            git commit -m "chore: bump version to ${NEW_VERSION} [skip ci]"
+            git push "https://djeex:${CI_PUSH_TOKEN}@git.djeex.fr/Djeex/nvidia-stock-bot.git" "HEAD:main"
+          else
+            NEW_VERSION="$CURRENT_VERSION"
+          fi
+
+          IFS='.' read -r MAJOR MINOR PATCH <<< "$NEW_VERSION"
+
+          docker tag nvidia-stock-bot:ci "${IMAGE}:latest"
+          docker tag nvidia-stock-bot:ci "${IMAGE}:${MAJOR}.${MINOR}"
+          docker tag nvidia-stock-bot:ci "${IMAGE}:${NEW_VERSION}"
+
+          echo "$REGISTRY_TOKEN" | docker login git.djeex.fr -u djeex --password-stdin
+          docker push "${IMAGE}:latest"
+          docker push "${IMAGE}:${MAJOR}.${MINOR}"
+          docker push "${IMAGE}:${NEW_VERSION}"
+
+          PR_NUMBER=$(git log -1 --format=%B | grep -oE '#[0-9]+' | head -1 | tr -d '#' || true)
+
+          PR_TITLE=""
+          LABELS=""
+          if [ -n "$PR_NUMBER" ]; then
+            PR_JSON=$(curl -s -H "Authorization: token ${CI_PUSH_TOKEN}" "${REPO_API}/pulls/${PR_NUMBER}")
+            PR_TITLE=$(echo "$PR_JSON" | jq -r '.title // empty')
+            LABELS=$(echo "$PR_JSON" | jq -r '[.labels[]?.name] | join(",")')
+          fi
+
+          CATEGORY="🔧 Maintenance"
+          if echo "$LABELS" | grep -qw "bug"; then
+            CATEGORY="⚠️ Hotfix"
+          elif echo "$LABELS" | grep -qw "major"; then
+            CATEGORY="💥 Breaking change"
+          elif echo "$LABELS" | grep -qw "minor"; then
+            CATEGORY="✨ Update"
+          fi
+
+          BODY="### ${CATEGORY}"$'\n\n'
+          if [ -n "$PR_NUMBER" ]; then
+            BODY="${BODY}**PR:** [#${PR_NUMBER}](${REPO_URL}/pulls/${PR_NUMBER}) — ${PR_TITLE}"$'\n'
+          fi
+          BODY="${BODY}**Commit:** [${GITHUB_SHA:0:7}](${REPO_URL}/commit/${GITHUB_SHA})"
+
+          curl -s -X POST \
+            -H "Authorization: token ${CI_PUSH_TOKEN}" \
+            -H "Content-Type: application/json" \
+            -d "$(jq -n --arg tag "$NEW_VERSION" --arg name "$NEW_VERSION" --arg body "$BODY" '{tag_name: $tag, name: $name, body: $body, draft: false, prerelease: false}')" \
+            "${REPO_API}/releases"
diff --git a/.gitignore b/.gitignore
index 7cd6f5d..2d61efc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 .venv
-__pycache__/
\ No newline at end of file
+__pycache__/
+.coverage
+.pytest_cache/
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
index 501bbfc..137d62e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.13-alpine
+FROM python:3.13.15-alpine AS base
 
 RUN apk add --no-cache ca-certificates
 
@@ -9,4 +9,15 @@ COPY /app/ /app/
 
 RUN pip install --no-cache-dir -r requirements.txt
 
-CMD ["python", "main.py"]
\ No newline at end of file
+FROM base AS test
+
+RUN pip install --no-cache-dir pytest==9.1.1
+
+COPY pytest.ini /app/pytest.ini
+COPY /tests/ /app/tests/
+
+CMD ["pytest", "-v"]
+
+FROM base
+
+CMD ["python", "main.py"]
diff --git a/app/requirements.txt b/app/requirements.txt
index 663bd1f..a258782 100644
--- a/app/requirements.txt
+++ b/app/requirements.txt
@@ -1 +1 @@
-requests
\ No newline at end of file
+requests==2.34.2
diff --git a/pytest.ini b/pytest.ini
new file mode 100644
index 0000000..eea2c18
--- /dev/null
+++ b/pytest.ini
@@ -0,0 +1 @@
+[pytest]
diff --git a/renovate.json b/renovate.json
new file mode 100644
index 0000000..cd8bc4c
--- /dev/null
+++ b/renovate.json
@@ -0,0 +1,29 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": ["config:recommended"],
+  "timezone": "Europe/Paris",
+  "labels": ["bot"],
+  "vulnerabilityAlerts": {
+    "addLabels": ["bug"]
+  },
+  "packageRules": [
+    {
+      "matchManagers": ["pip_requirements"],
+      "matchUpdateTypes": ["patch", "minor"],
+      "automerge": true
+    },
+    {
+      "matchManagers": ["dockerfile"],
+      "matchUpdateTypes": ["patch"],
+      "automerge": true
+    },
+    {
+      "matchUpdateTypes": ["major"],
+      "addLabels": ["major"]
+    },
+    {
+      "matchUpdateTypes": ["minor"],
+      "addLabels": ["minor"]
+    }
+  ]
+}
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..6e7ba78
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,17 @@
+import os
+import sys
+
+_TESTS_DIR = os.path.dirname(os.path.abspath(__file__))
+_REPO_ROOT = os.path.dirname(_TESTS_DIR)
+
+# app/*.py open their JSON config files with plain relative paths, so the
+# process cwd must be the directory the app modules live in — matches how
+# the Dockerfile runs them (WORKDIR /app).
+_APP_DIR = os.path.join(_REPO_ROOT, "app")
+if not os.path.isfile(os.path.join(_APP_DIR, "gpu_checker.py")):
+    _APP_DIR = _REPO_ROOT  # container test stage: code copied flat next to tests/
+
+if _APP_DIR not in sys.path:
+    sys.path.insert(0, _APP_DIR)
+
+os.chdir(_APP_DIR)
diff --git a/tests/test_env_config.py b/tests/test_env_config.py
new file mode 100644
index 0000000..c2100a6
--- /dev/null
+++ b/tests/test_env_config.py
@@ -0,0 +1,99 @@
+import importlib
+import sys
+
+import pytest
+
+MODULE_NAME = "env_config"
+
+VALID_WEBHOOK = "https://discord.com/api/webhooks/123456789012345678/abcdef"
+
+ENV_KEYS = [
+    "DISCORD_WEBHOOK_URL",
+    "DISCORD_SERVER_NAME",
+    "DISCORD_ROLES",
+    "COUNTRY",
+    "REFRESH_TIME",
+    "TEST_MODE",
+    "PRODUCT_NAMES",
+]
+
+
+def _reload_env_config(monkeypatch, env):
+    for key in ENV_KEYS:
+        monkeypatch.delenv(key, raising=False)
+    for key, value in env.items():
+        monkeypatch.setenv(key, value)
+    sys.modules.pop(MODULE_NAME, None)
+    return importlib.import_module(MODULE_NAME)
+
+
+def test_missing_webhook_exits(monkeypatch):
+    with pytest.raises(SystemExit):
+        _reload_env_config(monkeypatch, {"PRODUCT_NAMES": "RTX 5090"})
+
+
+def test_missing_product_names_exits(monkeypatch):
+    with pytest.raises(SystemExit):
+        _reload_env_config(monkeypatch, {"DISCORD_WEBHOOK_URL": VALID_WEBHOOK})
+
+
+def test_default_role_map_is_everyone(monkeypatch):
+    cfg = _reload_env_config(monkeypatch, {
+        "DISCORD_WEBHOOK_URL": VALID_WEBHOOK,
+        "PRODUCT_NAMES": "RTX 5090, RTX 5080",
+    })
+    assert cfg.DISCORD_ROLE_MAP == {"RTX 5090": "@everyone", "RTX 5080": "@everyone"}
+
+
+def test_role_count_mismatch_exits(monkeypatch):
+    with pytest.raises(SystemExit):
+        _reload_env_config(monkeypatch, {
+            "DISCORD_WEBHOOK_URL": VALID_WEBHOOK,
+            "PRODUCT_NAMES": "RTX 5090, RTX 5080",
+            "DISCORD_ROLES": "<@&123456789012345678>",
+        })
+
+
+def test_invalid_role_format_exits(monkeypatch):
+    with pytest.raises(SystemExit):
+        _reload_env_config(monkeypatch, {
+            "DISCORD_WEBHOOK_URL": VALID_WEBHOOK,
+            "PRODUCT_NAMES": "RTX 5090",
+            "DISCORD_ROLES": "not-a-role",
+        })
+
+
+def test_valid_role_format_accepted(monkeypatch):
+    cfg = _reload_env_config(monkeypatch, {
+        "DISCORD_WEBHOOK_URL": VALID_WEBHOOK,
+        "PRODUCT_NAMES": "RTX 5090",
+        "DISCORD_ROLES": "<@&123456789012345678>",
+    })
+    assert cfg.DISCORD_ROLE_MAP["RTX 5090"] == "<@&123456789012345678>"
+
+
+def test_unknown_country_falls_back_to_us(monkeypatch):
+    cfg = _reload_env_config(monkeypatch, {
+        "DISCORD_WEBHOOK_URL": VALID_WEBHOOK,
+        "PRODUCT_NAMES": "RTX 5090",
+        "COUNTRY": "ZZ",
+    })
+    assert cfg.currency == "$"
+
+
+def test_known_country_currency(monkeypatch):
+    cfg = _reload_env_config(monkeypatch, {
+        "DISCORD_WEBHOOK_URL": VALID_WEBHOOK,
+        "PRODUCT_NAMES": "RTX 5090",
+        "COUNTRY": "GB",
+    })
+    assert cfg.currency == "£"
+
+
+def test_refresh_time_invalid_exits(monkeypatch):
+    with pytest.raises(SystemExit):
+        _reload_env_config(monkeypatch, {
+            "DISCORD_WEBHOOK_URL": VALID_WEBHOOK,
+            "PRODUCT_NAMES": "RTX 5090",
+            "REFRESH_TIME": "not-a-number",
+        })
diff --git a/tests/test_gpu_checker.py b/tests/test_gpu_checker.py
new file mode 100644
index 0000000..51258b9
--- /dev/null
+++ b/tests/test_gpu_checker.py
@@ -0,0 +1,146 @@
+import importlib
+import sys
+
+VALID_WEBHOOK = "https://discord.com/api/webhooks/123456789012345678/abcdef"
+PRODUCT_NAME = "RTX 5090 Founders Edition"
+
+SKU_PAYLOAD = {
+    "searchedProducts": {
+        "productDetails": [
+            {"gpu": PRODUCT_NAME, "productSKU": "SKU-1", "productUPC": "ABC123"}
+        ]
+    }
+}
+
+
+class FakeResponse:
+    def __init__(self, payload, status_code=200):
+        self._payload = payload
+        self.status_code = status_code
+
+    def raise_for_status(self):
+        if self.status_code >= 400:
+            raise Exception(f"HTTP {self.status_code}")
+
+    def json(self):
+        return self._payload
+
+
+def _stock_payload(in_stock, price="1999"):
+    return {
+        "listMap": [
+            {"fe_sku": "ABC123", "is_active": "true" if in_stock else "false", "price": price}
+        ]
+    }
+
+
+def _import_gpu_checker(monkeypatch):
+    monkeypatch.setenv("DISCORD_WEBHOOK_URL", VALID_WEBHOOK)
+    monkeypatch.setenv("PRODUCT_NAMES", PRODUCT_NAME)
+    monkeypatch.setenv("TEST_MODE", "True")
+    monkeypatch.delenv("DISCORD_ROLES", raising=False)
+    for mod in ("env_config", "notifier", "gpu_checker"):
+        sys.modules.pop(mod, None)
+    return importlib.import_module("gpu_checker")
+
+
+def _queue_responses(monkeypatch, checker, *payloads):
+    responses = [FakeResponse(p) for p in payloads]
+    monkeypatch.setattr(checker.session, "get", lambda *a, **k: responses.pop(0))
+
+
+def test_transition_to_in_stock_sends_notification(monkeypatch):
+    checker = _import_gpu_checker(monkeypatch)
+    calls = []
+    monkeypatch.setattr(checker, "send_discord_notification", lambda *a: calls.append(("in_stock", a)))
+    monkeypatch.setattr(checker, "send_out_of_stock_notification", lambda *a: calls.append(("out_of_stock", a)))
+    monkeypatch.setattr(checker, "send_sku_change_notification", lambda *a: calls.append(("sku_change", a)))
+
+    _queue_responses(monkeypatch, checker, SKU_PAYLOAD, _stock_payload(True))
+    checker.check_rtx_50_founders()
+
+    assert len(calls) == 1
+    assert calls[0][0] == "in_stock"
+    assert calls[0][1][0] == PRODUCT_NAME
+
+
+def test_transition_to_out_of_stock_sends_notification(monkeypatch):
+    checker = _import_gpu_checker(monkeypatch)
+    calls = []
+    monkeypatch.setattr(checker, "send_discord_notification", lambda *a: calls.append(("in_stock", a)))
+    monkeypatch.setattr(checker, "send_out_of_stock_notification", lambda *a: calls.append(("out_of_stock", a)))
+    monkeypatch.setattr(checker, "send_sku_change_notification", lambda *a: calls.append(("sku_change", a)))
+
+    _queue_responses(monkeypatch, checker, SKU_PAYLOAD, _stock_payload(True))
+    checker.check_rtx_50_founders()
+
+    _queue_responses(monkeypatch, checker, SKU_PAYLOAD, _stock_payload(False))
+    checker.check_rtx_50_founders()
+
+    assert calls[-1][0] == "out_of_stock"
+    assert calls[-1][1][0] == PRODUCT_NAME
+
+
+def test_no_duplicate_notification_while_still_in_stock(monkeypatch):
+    checker = _import_gpu_checker(monkeypatch)
+    calls = []
+    monkeypatch.setattr(checker, "send_discord_notification", lambda *a: calls.append(("in_stock", a)))
+    monkeypatch.setattr(checker, "send_out_of_stock_notification", lambda *a: calls.append(("out_of_stock", a)))
+    monkeypatch.setattr(checker, "send_sku_change_notification", lambda *a: calls.append(("sku_change", a)))
+
+    _queue_responses(monkeypatch, checker, SKU_PAYLOAD, _stock_payload(True))
+    checker.check_rtx_50_founders()
+    _queue_responses(monkeypatch, checker, SKU_PAYLOAD, _stock_payload(True))
+    checker.check_rtx_50_founders()
+
+    assert len(calls) == 1
+
+
+def test_sku_change_triggers_notification_after_first_run(monkeypatch):
+    checker = _import_gpu_checker(monkeypatch)
+    sku_change_calls = []
+    monkeypatch.setattr(checker, "send_discord_notification", lambda *a: None)
+    monkeypatch.setattr(checker, "send_out_of_stock_notification", lambda *a: None)
+    monkeypatch.setattr(checker, "send_sku_change_notification", lambda *a: sku_change_calls.append(a))
+
+    _queue_responses(monkeypatch, checker, SKU_PAYLOAD, _stock_payload(False))
+    checker.check_rtx_50_founders()
+    assert sku_change_calls == []  # first run must never fire a "change" notification
+
+    changed_payload = {
+        "searchedProducts": {
+            "productDetails": [
+                {"gpu": PRODUCT_NAME, "productSKU": "SKU-2", "productUPC": "ABC123"}
+            ]
+        }
+    }
+    _queue_responses(monkeypatch, checker, changed_payload, _stock_payload(False))
+    checker.check_rtx_50_founders()
+
+    assert len(sku_change_calls) == 1
+    assert sku_change_calls[0][1] == "SKU-1"
+    assert sku_change_calls[0][2] == "SKU-2"
+
+
+def test_missing_product_in_api_is_skipped_gracefully(monkeypatch):
+    checker = _import_gpu_checker(monkeypatch)
+    calls = []
+    monkeypatch.setattr(checker, "send_discord_notification", lambda *a: calls.append(a))
+
+    empty_payload = {"searchedProducts": {"productDetails": []}}
+    monkeypatch.setattr(checker.session, "get", lambda *a, **k: FakeResponse(empty_payload))
+
+    checker.check_rtx_50_founders()  # must not raise, just log a warning and skip
+
+    assert calls == []
+
+
+def test_sku_api_error_is_handled_without_raising(monkeypatch):
+    checker = _import_gpu_checker(monkeypatch)
+
+    def raise_error(*a, **k):
+        raise checker.requests.exceptions.ConnectionError("boom")
+
+    monkeypatch.setattr(checker.session, "get", raise_error)
+
+    checker.check_rtx_50_founders()  # must not propagate the network error
diff --git a/tests/test_notifier.py b/tests/test_notifier.py
new file mode 100644
index 0000000..e8fdf58
--- /dev/null
+++ b/tests/test_notifier.py
@@ -0,0 +1,163 @@
+import importlib
+import sys
+
+VALID_WEBHOOK = "https://discord.com/api/webhooks/123456789012345678/abcdef"
+
+
+def _import_notifier(monkeypatch, test_mode="False", discord_roles=None):
+    monkeypatch.setenv("DISCORD_WEBHOOK_URL", VALID_WEBHOOK)
+    monkeypatch.setenv("PRODUCT_NAMES", "RTX 5090 Founders Edition")
+    monkeypatch.setenv("TEST_MODE", test_mode)
+    if discord_roles is not None:
+        monkeypatch.setenv("DISCORD_ROLES", discord_roles)
+    else:
+        monkeypatch.delenv("DISCORD_ROLES", raising=False)
+    for mod in ("env_config", "notifier"):
+        sys.modules.pop(mod, None)
+    return importlib.import_module("notifier")
+
+
+class FakeResponse:
+    def __init__(self, status_code=204, text=""):
+        self.status_code = status_code
+        self.text = text
+
+
+def test_test_mode_skips_network_call(monkeypatch):
+    notifier = _import_notifier(monkeypatch, test_mode="True")
+    calls = []
+    monkeypatch.setattr(notifier.requests, "post", lambda *a, **k: calls.append((a, k)))
+
+    notifier.send_discord_notification("RTX 5090 Founders Edition", "https://example.com", "1999")
+
+    assert calls == []
+
+
+def test_in_stock_notification_posts_expected_payload(monkeypatch):
+    notifier = _import_notifier(monkeypatch, test_mode="False")
+    captured = {}
+
+    def fake_post(url, json=None, **kwargs):
+        captured["url"] = url
+        captured["json"] = json
+        return FakeResponse()
+
+    monkeypatch.setattr(notifier.requests, "post", fake_post)
+
+    notifier.send_discord_notification("RTX 5090 Founders Edition", "https://example.com/buy", "1999")
+
+    assert captured["url"] == notifier.DISCORD_WEBHOOK_URL
+    assert captured["json"]["content"] == "@everyone"
+    embed = captured["json"]["embeds"][0]
+    assert "RTX 5090 Founders Edition" in embed["title"]
+
+
+def test_discord_notification_survives_http_error(monkeypatch):
+    notifier = _import_notifier(monkeypatch, test_mode="False")
+    monkeypatch.setattr(notifier.requests, "post", lambda *a, **k: FakeResponse(status_code=500, text="boom"))
+
+    notifier.send_discord_notification("RTX 5090 Founders Edition", "https://example.com", "1999")
+
+
+def test_discord_notification_survives_connection_error(monkeypatch):
+    notifier = _import_notifier(monkeypatch, test_mode="False")
+
+    def raise_error(*a, **k):
+        raise notifier.requests.exceptions.ConnectionError("boom")
+
+    monkeypatch.setattr(notifier.requests, "post", raise_error)
+
+    # Should not raise even though the request itself blew up (network down, DNS, etc.)
+    notifier.send_discord_notification("RTX 5090 Founders Edition", "https://example.com", "1999")
+
+
+def test_out_of_stock_test_mode_skips_network_call(monkeypatch):
+    notifier = _import_notifier(monkeypatch, test_mode="True")
+    calls = []
+    monkeypatch.setattr(notifier.requests, "post", lambda *a, **k: calls.append((a, k)))
+
+    notifier.send_out_of_stock_notification("RTX 5090 Founders Edition", "https://example.com", "1999")
+
+    assert calls == []
+
+
+def test_out_of_stock_notification_posts_on_success(monkeypatch):
+    notifier = _import_notifier(monkeypatch, test_mode="False")
+    captured = {}
+
+    def fake_post(url, json=None, **kwargs):
+        captured["json"] = json
+        return FakeResponse(status_code=204)
+
+    monkeypatch.setattr(notifier.requests, "post", fake_post)
+
+    notifier.send_out_of_stock_notification("RTX 5090 Founders Edition", "https://example.com/buy", "1999")
+
+    assert captured["json"]["embeds"][0]["url"] == "https://example.com/buy"
+
+
+def test_out_of_stock_notification_survives_http_error(monkeypatch):
+    notifier = _import_notifier(monkeypatch, test_mode="False")
+    monkeypatch.setattr(notifier.requests, "post", lambda *a, **k: FakeResponse(status_code=500, text="boom"))
+
+    # Should not raise even though the webhook call "fails"
+    notifier.send_out_of_stock_notification("RTX 5090 Founders Edition", "https://example.com", "1999")
+
+
+def test_out_of_stock_notification_survives_connection_error(monkeypatch):
+    notifier = _import_notifier(monkeypatch, test_mode="False")
+
+    def raise_error(*a, **k):
+        raise notifier.requests.exceptions.ConnectionError("boom")
+
+    monkeypatch.setattr(notifier.requests, "post", raise_error)
+
+    notifier.send_out_of_stock_notification("RTX 5090 Founders Edition", "https://example.com", "1999")
+
+
+def test_sku_change_test_mode_skips_network_call(monkeypatch):
+    notifier = _import_notifier(monkeypatch, test_mode="True")
+    calls = []
+    monkeypatch.setattr(notifier.requests, "post", lambda *a, **k: calls.append((a, k)))
+
+    notifier.send_sku_change_notification("RTX 5090 Founders Edition", "old-sku", "new-sku", "https://example.com")
+
+    assert calls == []
+
+
+def test_sku_change_notification_survives_http_error(monkeypatch):
+    notifier = _import_notifier(monkeypatch, test_mode="False")
+    monkeypatch.setattr(notifier.requests, "post", lambda *a, **k: FakeResponse(status_code=500, text="boom"))
+
+    notifier.send_sku_change_notification("RTX 5090 Founders Edition", "old-sku", "new-sku", "https://example.com")
+
+
+def test_sku_change_notification_survives_connection_error(monkeypatch):
+    notifier = _import_notifier(monkeypatch, test_mode="False")
+
+    def raise_error(*a, **k):
+        raise notifier.requests.exceptions.ConnectionError("boom")
+
+    monkeypatch.setattr(notifier.requests, "post", raise_error)
+
+    notifier.send_sku_change_notification("RTX 5090 Founders Edition", "old-sku", "new-sku", "https://example.com")
+
+
+def test_sku_change_notification_mentions_role_and_skus(monkeypatch):
+    notifier = _import_notifier(monkeypatch, test_mode="False", discord_roles="<@&123456789012345678>")
+    captured = {}
+
+    def fake_post(url, json=None, **kwargs):
+        captured["json"] = json
+        return FakeResponse()
+
+    monkeypatch.setattr(notifier.requests, "post", fake_post)
+
+    notifier.send_sku_change_notification(
+        "RTX 5090 Founders Edition", "old-sku-123", "new-sku-456", "https://example.com"
+    )
+
+    assert "<@&123456789012345678>" in captured["json"]["content"]
+    description = captured["json"]["embeds"][0]["description"]
+    assert "old-sku-123" in description
+    assert "new-sku-456" in description