diff --git a/api/outdated/conftest.py b/api/outdated/conftest.py
index 3d3a1831..91973d6d 100644
--- a/api/outdated/conftest.py
+++ b/api/outdated/conftest.py
@@ -1,6 +1,7 @@
 from functools import partial
 
 import pytest
+from django.core.management import call_command
 from pytest_factoryboy import register
 from rest_framework.test import APIClient
 
@@ -59,6 +60,18 @@ def client(db, settings, get_claims):
     return client
 
 
+@pytest.fixture
+def setup_notifications(transactional_db, settings):
+    settings.NOTIFICATIONS = [
+        ("test-foo", 60),
+        ("test-bar", 10),
+        ("test-baz", -20),
+    ]
+    call_command("update-notifications")
+    settings.TEMPLATES[0]["DIRS"] = ["outdated/notifications/tests/templates"]
+    settings.TEMPLATES[0]["APP_DIRS"] = False
+
+
 @pytest.fixture(scope="module")
 def vcr_config():
     return {
diff --git a/api/outdated/notifications/tests/__init__.py b/api/outdated/notifications/tests/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/api/outdated/notifications/tests/templates/base.txt b/api/outdated/notifications/tests/templates/base.txt
new file mode 100644
index 00000000..55f1e8b5
--- /dev/null
+++ b/api/outdated/notifications/tests/templates/base.txt
@@ -0,0 +1,8 @@
+{% block subject -%}
+{% endblock -%}
+
+Project: {{project.name}}
+Repo: {{project.repo}}
+
+{% block content -%}
+{% endblock %}
diff --git a/api/outdated/notifications/tests/templates/test-bar.txt b/api/outdated/notifications/tests/templates/test-bar.txt
new file mode 100644
index 00000000..07eba94d
--- /dev/null
+++ b/api/outdated/notifications/tests/templates/test-bar.txt
@@ -0,0 +1,9 @@
+{% extends 'base.txt' %}
+
+{% block subject %}
+bar
+{% endblock %}
+
+{% block content %}
+test-bar.txt contents
+{% endblock %}
diff --git a/api/outdated/notifications/tests/templates/test-baz.txt b/api/outdated/notifications/tests/templates/test-baz.txt
new file mode 100644
index 00000000..182a49bc
--- /dev/null
+++ b/api/outdated/notifications/tests/templates/test-baz.txt
@@ -0,0 +1,9 @@
+{% extends 'base.txt' %}
+
+{% block subject %}
+baz
+{% endblock %}
+
+{% block content %}
+test-baz.txt contents
+{% endblock %}
diff --git a/api/outdated/notifications/tests/templates/test-foo.txt b/api/outdated/notifications/tests/templates/test-foo.txt
new file mode 100644
index 00000000..85c1ecc9
--- /dev/null
+++ b/api/outdated/notifications/tests/templates/test-foo.txt
@@ -0,0 +1,9 @@
+{% extends 'base.txt' %}
+
+{% block subject %}
+foo
+{% endblock %}
+
+{% block content %}
+test-foo.txt contents
+{% endblock %}
diff --git a/api/outdated/notifications/tests/test_build_notification_queue.py b/api/outdated/notifications/tests/test_build_notification_queue.py
new file mode 100644
index 00000000..0c639c30
--- /dev/null
+++ b/api/outdated/notifications/tests/test_build_notification_queue.py
@@ -0,0 +1,47 @@
+from datetime import date, timedelta
+from unittest.mock import MagicMock
+
+import pytest
+from pytest_mock import MockerFixture
+
+from .. import models
+
+
+@pytest.mark.parametrize(
+    "status,called",
+    (["UNDEFINED", False], ["OUTDATED", True], ["WARNING", True], ["UP-TO-DATE", True]),
+)
+def test_build_notification_queue_called(
+    transactional_db,
+    mocker: MockerFixture,
+    status,
+    called,
+    project_factory,
+    release_version_factory,
+    version_factory,
+):
+    build_notification_queue_mock: MagicMock = mocker.patch.object(
+        models, "build_notification_queue"
+    )
+    release_version = release_version_factory(
+        undefined=status == "UNDEFINED",
+        outdated=status == "OUTDATED",
+        warning=status == "WARNING",
+        up_to_date=status == "UP-TO-DATE",
+    )
+    version = version_factory(release_version=release_version)
+    project = project_factory()
+    assert build_notification_queue_mock.call_count == 0
+    project.versioned_dependencies.add(version)
+
+    if called:
+        build_notification_queue_mock.assert_called_with(project)
+        other_project = project_factory(versioned_dependencies=[version])
+        build_notification_queue_mock.assert_called_with(other_project)
+
+        release_version.end_of_life = date.today() + timedelta(days=2000)
+        release_version.save()
+
+        assert build_notification_queue_mock.call_count == 4
+    else:
+        assert build_notification_queue_mock.call_count == 0
diff --git a/api/outdated/notifications/tests/test_management_commands.py b/api/outdated/notifications/tests/test_management_commands.py
new file mode 100644
index 00000000..e229e39f
--- /dev/null
+++ b/api/outdated/notifications/tests/test_management_commands.py
@@ -0,0 +1,29 @@
+from django.core.management import call_command
+
+from outdated.notifications.notifier import Notifier
+
+
+def test_notify(
+    db,
+    project,
+    maintainer_factory,
+    version_factory,
+    release_version_factory,
+    capsys,
+    mocker,
+):
+    call_command("notify", project.name)
+    stdout, _ = capsys.readouterr()
+    assert stdout == f"Skipped {project.name} (no-maintainers)\n"
+    maintainer_factory(project=project)
+    call_command("notify", project.name)
+    notify_mocker = mocker.spy(Notifier, "__init__")
+    stdout, _ = capsys.readouterr()
+    assert stdout == ""
+    notify_mocker.assert_not_called()
+    project.versioned_dependencies.set(
+        [version_factory(release_version=release_version_factory(warning=True))]
+    )
+    project.save()
+    call_command("notify", project.name)
+    notify_mocker.assert_called_once()
diff --git a/api/outdated/notifications/tests/test_notifier.py b/api/outdated/notifications/tests/test_notifier.py
new file mode 100644
index 00000000..7181fb20
--- /dev/null
+++ b/api/outdated/notifications/tests/test_notifier.py
@@ -0,0 +1,58 @@
+from datetime import date, timedelta
+from typing import Optional
+
+import pytest
+
+from outdated.notifications.notifier import Notifier
+from outdated.outdated.models import Maintainer
+
+
+@pytest.mark.parametrize("nonprimary_maintainers", [False, True])
+@pytest.mark.parametrize(
+    "days_until_outdated,template,sent",
+    [
+        (200, None, False),
+        (60, "test-foo", True),
+        (50, "test-foo", True),
+        (10, "test-bar", True),
+        (-20, "test-baz", True),
+    ],
+)
+def test_send_notification(
+    setup_notifications,
+    days_until_outdated: int,
+    template: Optional[str],
+    sent: bool,
+    nonprimary_maintainers: bool,
+    maintainer,
+    maintainer_factory,
+    mailoutbox,
+    version_factory,
+    release_version_factory,
+):
+    project = maintainer.project
+    release_version = release_version_factory(
+        end_of_life=date.today() + timedelta(days=days_until_outdated)
+    )
+    version = version_factory(release_version=release_version)
+    project.versioned_dependencies.add(version)
+    project.save()
+    if nonprimary_maintainers:
+        maintainer_factory(project=project)
+        maintainer_factory(project=project)
+        maintainer_factory(project=project)
+    nonprimary_maintainers = list(Maintainer.objects.filter(is_primary=False))
+    notification_queue = list(project.notification_queue.all())
+    Notifier(project).notify()
+    if sent:
+        mail = mailoutbox[0]
+        assert mail.subject == template.replace("test-", "")
+        assert (
+            mail.body
+            == f"Project: {project.name}\nRepo: {project.repo}\n\n{template}.txt contents\n"
+        )
+        assert mail.to[0] == maintainer.user.email
+        assert mail.cc == [m.user.email for m in nonprimary_maintainers]
+        assert notification_queue[1:] == list(project.notification_queue.all())
+    else:
+        assert not mailoutbox