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();
+    }
+}

tests/OtherwiseTest.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Tests\Opdavies\GmailFilterBuilder;
+
+use Opdavies\GmailFilterBuilder\Model\Filter;
+use Opdavies\GmailFilterBuilder\Model\FilterGroup;
+use PHPUnit\Framework\TestCase;
+
+class OtherwiseTest extends TestCase
+{
+
+    /** @test */
+    public function it_returns_the_correct_number_of_filters()
+    {
+        $filters = FilterGroup::if(
+            Filter::create()
+                ->has('to:me@example.com foo')
+                ->labelAndArchive('Test')
+        )->otherwise(
+            Filter::create()
+                ->has('to:me@example.com bar')
+                ->read()
+        )->otherwise(
+            Filter::create()
+                ->has('to:me@example.com')
+                ->trash()
+      );
+
+        $this->assertCount(3, $filters->toArray());
+    }
+}