diff --git a/src/ORM/ListDecorator.php b/src/ORM/ListDecorator.php
index b141d548e..8620168ff 100644
--- a/src/ORM/ListDecorator.php
+++ b/src/ORM/ListDecorator.php
@@ -173,8 +173,7 @@ abstract class ListDecorator extends ViewableData implements SS_List, Sortable,
      */
     public function sort()
     {
-        $args = func_get_args();
-        return call_user_func_array(array($this->list, 'sort'), $args);
+        return $this->list->sort(...func_get_args());
     }
 
     public function canFilterBy($by)
@@ -192,8 +191,7 @@ abstract class ListDecorator extends ViewableData implements SS_List, Sortable,
      */
     public function filter()
     {
-        $args = func_get_args();
-        return call_user_func_array(array($this->list, 'filter'), $args);
+        return $this->list->filter(...func_get_args());
     }
 
     /**
@@ -220,7 +218,7 @@ abstract class ListDecorator extends ViewableData implements SS_List, Sortable,
      */
     public function filterAny()
     {
-        return call_user_func_array(array($this->list, __FUNCTION__), func_get_args());
+        return $this->list->filterAny(...func_get_args());
     }
 
     /**
@@ -242,7 +240,7 @@ abstract class ListDecorator extends ViewableData implements SS_List, Sortable,
         }
         $output = ArrayList::create();
         foreach ($this->list as $item) {
-            if (call_user_func($callback, $item, $this->list)) {
+            if ($callback($item, $this->list)) {
                 $output->push($item);
             }
         }
@@ -286,8 +284,7 @@ abstract class ListDecorator extends ViewableData implements SS_List, Sortable,
      */
     public function exclude()
     {
-        $args = func_get_args();
-        return call_user_func_array(array($this->list, 'exclude'), $args);
+        return $this->list->exclude(...func_get_args());
     }
 
     public function debug()
diff --git a/tests/php/ORM/ListDecoratorTest.php b/tests/php/ORM/ListDecoratorTest.php
new file mode 100644
index 000000000..6fe45fdd2
--- /dev/null
+++ b/tests/php/ORM/ListDecoratorTest.php
@@ -0,0 +1,278 @@
+<?php
+
+namespace SilverStripe\ORM\Tests;
+
+use PHPUnit_Framework_MockObject_MockObject;
+use SilverStripe\Dev\SapphireTest;
+use SilverStripe\ORM\ArrayList;
+use SilverStripe\ORM\ListDecorator;
+use SilverStripe\ORM\SS_List;
+
+/**
+ * This test class is testing that ListDecorator correctly proxies its calls through to the underlying SS_List
+ */
+class ListDecoratorTest extends SapphireTest
+{
+    /**
+     * @var ArrayList|PHPUnit_Framework_MockObject_MockObject
+     */
+    protected $list;
+
+    /**
+     * @var ListDecorator|PHPUnit_Framework_MockObject_MockObject
+     */
+    protected $decorator;
+
+    protected function setUp()
+    {
+        parent::setUp();
+
+        $this->list = $this->createMock(ArrayList::class);
+        $this->decorator = $this->getMockForAbstractClass(ListDecorator::class, [$this->list]);
+    }
+
+    public function testGetIterator()
+    {
+        $this->list->expects($this->once())->method('getIterator')->willReturn('mock');
+        $this->assertSame('mock', $this->decorator->getIterator());
+    }
+
+    public function testCanSortBy()
+    {
+        $this->list->expects($this->once())->method('canSortBy')->with('foo')->willReturn(true);
+        $this->assertTrue($this->decorator->canSortBy('foo'));
+    }
+
+    public function testRemove()
+    {
+        $this->list->expects($this->once())->method('remove')->with('foo');
+        $this->decorator->remove('foo');
+    }
+
+    /**
+     * @param array $input
+     * @dataProvider filterProvider
+     */
+    public function testExclude($input)
+    {
+        $this->list->expects($this->once())->method('exclude')->with($input)->willReturn('mock');
+        $this->assertSame('mock', $this->decorator->exclude($input));
+    }
+
+    /**
+     * @param array $input
+     * @dataProvider filterProvider
+     */
+    public function testFilter($input)
+    {
+        $this->list->expects($this->once())->method('filter')->with($input)->willReturn('mock');
+        $this->assertSame('mock', $this->decorator->filter($input));
+    }
+
+    /**
+     * @param array $input
+     * @dataProvider filterProvider
+     */
+    public function testFilterAny($input)
+    {
+        $this->list->expects($this->once())->method('filterAny')->with($input)->willReturn('mock');
+        $this->assertSame('mock', $this->decorator->filterAny($input));
+    }
+
+    /**
+     * @param array $input
+     * @dataProvider filterProvider
+     */
+    public function testSort($input)
+    {
+        $this->list->expects($this->once())->method('sort')->with($input)->willReturn('mock');
+        $this->assertSame('mock', $this->decorator->sort($input));
+    }
+
+    /**
+     * @return array[]
+     */
+    public function filterProvider()
+    {
+        return [
+            ['Name', 'Bob'],
+            ['Name', ['aziz', 'Bob']],
+            [['Name' =>'bob', 'Age' => 21]],
+            [['Name' =>'bob', 'Age' => [21, 43]]],
+        ];
+    }
+
+    public function testCanFilterBy()
+    {
+        $this->list->expects($this->once())->method('canFilterBy')->with('Title')->willReturn(false);
+        $this->assertFalse($this->decorator->canFilterBy('Title'));
+    }
+
+    /**
+     * @expectedException \LogicException
+     * @expectedExceptionMessage SS_Filterable::filterByCallback() passed callback must be callable, 'boolean' given
+     */
+    public function testFilterByCallbackThrowsExceptionWhenGivenNonCallable()
+    {
+        $this->decorator->filterByCallback(true);
+    }
+
+    public function testFilterByCallback()
+    {
+        $input = new ArrayList([
+            ['Name' => 'Leslie'],
+            ['Name' => 'Maxime'],
+            ['Name' => 'Sal'],
+        ]);
+
+        $callback = function ($item, SS_List $list) {
+            return $item->Name === 'Maxime';
+        };
+
+        $this->decorator->setList($input);
+        $result = $this->decorator->filterByCallback($callback);
+
+        $this->assertCount(1, $result);
+        $this->assertSame('Maxime', $result->first()->Name);
+    }
+
+    public function testFind()
+    {
+        $this->list->expects($this->once())->method('find')->with('foo', 'bar')->willReturn('mock');
+        $this->assertSame('mock', $this->decorator->find('foo', 'bar'));
+    }
+
+    public function testDebug()
+    {
+        $this->list->expects($this->once())->method('debug')->willReturn('mock');
+        $this->assertSame('mock', $this->decorator->debug());
+    }
+
+    public function testCount()
+    {
+        $this->list->expects($this->once())->method('count')->willReturn(5);
+        $this->assertSame(5, $this->decorator->Count());
+    }
+
+    public function testEach()
+    {
+        $callable = function () {
+            // noop
+        };
+        $this->list->expects($this->once())->method('each')->with($callable)->willReturn('mock');
+        $this->assertSame('mock', $this->decorator->each($callable));
+    }
+
+    public function testOffsetExists()
+    {
+        $this->list->expects($this->once())->method('offsetExists')->with('foo')->willReturn('mock');
+        $this->assertSame('mock', $this->decorator->offsetExists('foo'));
+    }
+
+    public function testGetList()
+    {
+        $this->assertSame($this->list, $this->decorator->getList());
+    }
+
+    public function testColumnUnique()
+    {
+        $this->list->expects($this->once())->method('columnUnique')->with('ID')->willReturn('mock');
+        $this->assertSame('mock', $this->decorator->columnUnique('ID'));
+    }
+
+    public function testMap()
+    {
+        $this->list->expects($this->once())->method('map')->with('ID', 'Title')->willReturn('mock');
+        $this->assertSame('mock', $this->decorator->map('ID', 'Title'));
+    }
+
+    public function testReverse()
+    {
+        $this->list->expects($this->once())->method('reverse')->willReturn('mock');
+        $this->assertSame('mock', $this->decorator->reverse());
+    }
+
+    public function testOffsetGet()
+    {
+        $this->list->expects($this->once())->method('offsetGet')->with(2)->willReturn('mock');
+        $this->assertSame('mock', $this->decorator->offsetGet(2));
+    }
+
+    public function testExists()
+    {
+        $this->list->expects($this->once())->method('exists')->willReturn(false);
+        $this->assertFalse($this->decorator->exists());
+    }
+
+    public function testByID()
+    {
+        $this->list->expects($this->once())->method('byID')->with(123)->willReturn('mock');
+        $this->assertSame('mock', $this->decorator->byID(123));
+    }
+
+    public function testByIDs()
+    {
+        $this->list->expects($this->once())->method('byIDs')->with([1, 2])->willReturn('mock');
+        $this->assertSame('mock', $this->decorator->byIDs([1, 2]));
+    }
+
+    public function testToArray()
+    {
+        $this->list->expects($this->once())->method('toArray')->willReturn(['foo', 'bar']);
+        $this->assertSame(['foo', 'bar'], $this->decorator->toArray());
+    }
+
+    public function testToNestedArray()
+    {
+        $this->list->expects($this->once())->method('toNestedArray')->willReturn(['foo', 'bar']);
+        $this->assertSame(['foo', 'bar'], $this->decorator->toNestedArray());
+    }
+
+    public function testOffsetSet()
+    {
+        $this->list->expects($this->once())->method('offsetSet')->with('foo', 'bar');
+        $this->decorator->offsetSet('foo', 'bar');
+    }
+
+    public function testOffsetUnset()
+    {
+        $this->list->expects($this->once())->method('offsetUnset')->with('foo');
+        $this->decorator->offsetUnset('foo');
+    }
+
+    public function testLimit()
+    {
+        $this->list->expects($this->once())->method('limit')->with(5, 3)->willReturn('mock');
+        $this->assertSame('mock', $this->decorator->limit(5, 3));
+    }
+
+    public function testTotalItems()
+    {
+        $this->list->expects($this->once())->method('count')->willReturn(5);
+        $this->assertSame(5, $this->decorator->TotalItems());
+    }
+
+    public function testAdd()
+    {
+        $this->list->expects($this->once())->method('add')->with('foo')->willReturn('mock');
+        $this->decorator->add('foo');
+    }
+
+    public function testFirst()
+    {
+        $this->list->expects($this->once())->method('first')->willReturn(1);
+        $this->assertSame(1, $this->decorator->first());
+    }
+
+    public function testLast()
+    {
+        $this->list->expects($this->once())->method('last')->willReturn(10);
+        $this->assertSame(10, $this->decorator->last());
+    }
+
+    public function testColumn()
+    {
+        $this->list->expects($this->once())->method('column')->with('DOB')->willReturn('mock');
+        $this->assertSame('mock', $this->decorator->column('DOB'));
+    }
+}