function TypedDataTest::testTypedDataListsLast

Tests the last() method on typed data lists.

File

core/tests/Drupal/KernelTests/Core/TypedData/TypedDataTest.php, line 701

Class

TypedDataTest

Tests the functionality of all core data types.

Namespace

Code

public function testTypedDataListsLast() : void {
    // Create an ItemList with two string items.
    $value = [
        'zero',
        'one',
    ];
    $typed_data = $this->createTypedData(ListDataDefinition::create('string'), $value);
    // Assert that the last item is the second one ('one').
    $this->assertEquals('one', $typed_data->last()
        ->getValue());
    // Add another item to the list and check the last item.
    $value[] = 'two';
    $typed_data = $this->createTypedData(ListDataDefinition::create('string'), $value);
    $this->assertEquals('two', $typed_data->last()
        ->getValue());
    // Check behavior with an empty list.
    $typed_data = $this->createTypedData(ListDataDefinition::create('string'), []);
    $this->assertNull($typed_data->last(), 'Empty list should return NULL.');
}