A filter group contains the correct number of filters

src/Model/FilterGroup.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace Opdavies\GmailFilterBuilder\Model;
+
+use Tightenco\Collect\Support\Collection;
+
+class FilterGroup
+{
+    /** @var Collection */
+    private $filters;
+
+    public function __construct()
+    {
+        $this->filters = new Collection();
+    }
+
+    public static function if(Filter $filter): self
+    {
+        $self = new static();
+
+        $self->filters->push($filter);
+
+        return $self;
+    }
+
+    public function otherwise(Filter $filter): self
+    {
+        $this->filters->push($filter);
+
+        return $this;
+    }
+
+    public function toArray(): array
+    {
+        return $this->filters->toArray();
+    }
+}