diff --git a/src/AttendeeLoader.php b/src/AttendeeLoader.php
new file mode 100644
index 0000000..f7abb4a
--- /dev/null
+++ b/src/AttendeeLoader.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace App;
+
+use Illuminate\Support\Collection;
+
+interface AttendeeLoader
+{
+    public function getAttendees(): Collection;
+}
diff --git a/src/EventRepository.php b/src/EventRepository.php
new file mode 100644
index 0000000..e1f5fec
--- /dev/null
+++ b/src/EventRepository.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace App;
+
+interface EventRepository
+{
+    public function getConfirmedAttendees(): array;
+}
diff --git a/tests/EventRepositoryTest.php b/tests/EventRepositoryTest.php
new file mode 100644
index 0000000..e617b26
--- /dev/null
+++ b/tests/EventRepositoryTest.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace App\Tests;
+
+use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
+
+final class EventRepositoryTest extends KernelTestCase
+{
+    /** @test */
+    public function should_only_return_attendees_with_a_yes_rsvp(): array {
+        return [];
+    }
+}
diff --git a/tests/FakeEventRepository.php b/tests/FakeEventRepository.php
new file mode 100644
index 0000000..d1d93fd
--- /dev/null
+++ b/tests/FakeEventRepository.php
@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests;
+
+use App\EventRepository;
+
+final class FakeEventRepository implements EventRepository
+{
+    public function getConfirmedAttendees(): array {
+        return [];
+    }
+}