From a13a2cdd40fbdfe89e128e1ff47346e16bb918d1 Mon Sep 17 00:00:00 2001
From: Maxime Rainville <maxime@silverstripe.com>
Date: Mon, 8 Oct 2018 14:24:19 +1300
Subject: [PATCH] Add unit test for FieldList::getContainerField()

---
 tests/php/Forms/FieldListTest.php | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tests/php/Forms/FieldListTest.php b/tests/php/Forms/FieldListTest.php
index a11264972..5309e88f1 100644
--- a/tests/php/Forms/FieldListTest.php
+++ b/tests/php/Forms/FieldListTest.php
@@ -1176,4 +1176,18 @@ class FieldListTest extends SapphireTest
         // put all your HiddenFields at the top level.
         $this->assertNotNull($visible->dataFieldByName('D2'));
     }
+
+    public function testContainerField()
+    {
+        $fieldlist = new FieldList();
+        $container = CompositeField::create();
+
+        $this->assertNull($fieldlist->getContainerField());
+
+        $fieldlist->setContainerField($container);
+        $this->assertEquals($container, $fieldlist->getContainerField());
+
+        $fieldlist->setContainerField(null);
+        $this->assertNull($fieldlist->getContainerField());
+    }
 }