diff --git a/tests/Group/ConnectionGroupTest.php b/tests/Group/ConnectionGroupTest.php
new file mode 100644
index 0000000..db7ea97
--- /dev/null
+++ b/tests/Group/ConnectionGroupTest.php
@@ -0,0 +1,52 @@
+<?php
+
+namespace NoccyLabs\React\WebSocket\Group;
+
+use NoccyLabs\React\WebSocket\WebSocketConnection;
+use PHPUnit\Framework\Attributes\CoversClass;
+use React\Http\Message\ServerRequest;
+use React\Stream\ThroughStream;
+
+#[CoversClass(ConnectionGroup::class)]
+class ConnectionGroupTest extends \PHPUnit\Framework\TestCase
+{
+
+    public function testThatGroupsAreCountable()
+    {
+        $groupManager = new GroupManager();
+        
+        $group = new ConnectionGroup();
+        $this->assertEquals(0, count($group));
+        $group->add(new WebSocketConnection(new ServerRequest('GET','/'),new ThroughStream(), new ThroughStream(), $groupManager));
+        $this->assertEquals(1, count($group));
+        $group->add(new WebSocketConnection(new ServerRequest('GET','/'),new ThroughStream(), new ThroughStream(), $groupManager));
+        $this->assertEquals(2, count($group));
+        $group->add(new WebSocketConnection(new ServerRequest('GET','/'),new ThroughStream(), new ThroughStream(), $groupManager));
+        $this->assertEquals(3, count($group));
+    }
+
+    public function testThatGroupNamesAreAssignedUniquely()
+    {
+        $group = new ConnectionGroup();
+        $this->assertNotEmpty($group->getName());
+
+        $group2 = new ConnectionGroup();
+        $this->assertNotEmpty($group2->getName());
+
+        $this->assertNotEquals($group->getName(), $group2->getName());
+    }
+
+    public function testWritingToAll()
+    {
+        $groupManager = new GroupManager();
+        
+        $r = [];
+        $group = new ConnectionGroup();
+        $group->add(new WebSocketConnection(new ServerRequest('GET','/'),new ThroughStream(), new ThroughStream(function ($data) use (&$r) { $r[]=$data; }), $groupManager));
+        $group->add(new WebSocketConnection(new ServerRequest('GET','/'),new ThroughStream(), new ThroughStream(function ($data) use (&$r) { $r[]=$data; }), $groupManager));
+        $group->add(new WebSocketConnection(new ServerRequest('GET','/'),new ThroughStream(), new ThroughStream(function ($data) use (&$r) { $r[]=$data; }), $groupManager));
+        $group->writeAll("test");
+        $this->assertEquals(3, count($r));
+    }
+
+}
\ No newline at end of file