--- /dev/null
+<?php
+
+namespace Drupal\Tests\rest\Unit;
+
+use Drupal\Core\Entity\EntityConstraintViolationList;
+use Drupal\node\Entity\Node;
+use Drupal\Tests\UnitTestCase;
+use Drupal\user\Entity\User;
+use Symfony\Component\HttpKernel\Exception\UnprocessableEntityHttpException;
+use Symfony\Component\Validator\ConstraintViolationInterface;
+
+/**
+ * @group rest
+ * @coversDefaultClass \Drupal\rest\Plugin\rest\resource\EntityResourceValidationTrait
+ */
+class EntityResourceValidationTraitTest extends UnitTestCase {
+
+ /**
+ * @covers ::validate
+ */
+ public function testValidate() {
+ $trait = $this->getMockForTrait('Drupal\rest\Plugin\rest\resource\EntityResourceValidationTrait');
+
+ $method = new \ReflectionMethod($trait, 'validate');
+ $method->setAccessible(TRUE);
+
+ $violations = $this->prophesize(EntityConstraintViolationList::class);
+ $violations->filterByFieldAccess()->shouldBeCalled()->willReturn([]);
+ $violations->count()->shouldBeCalled()->willReturn(0);
+
+ $entity = $this->prophesize(Node::class);
+ $entity->validate()->shouldBeCalled()->willReturn($violations->reveal());
+
+ $method->invoke($trait, $entity->reveal());
+ }
+
+ /**
+ * @covers ::validate
+ */
+ public function testFailedValidate() {
+ $violation1 = $this->prophesize(ConstraintViolationInterface::class);
+ $violation1->getPropertyPath()->willReturn('property_path');
+ $violation1->getMessage()->willReturn('message');
+
+ $violation2 = $this->prophesize(ConstraintViolationInterface::class);
+ $violation2->getPropertyPath()->willReturn('property_path');
+ $violation2->getMessage()->willReturn('message');
+
+ $entity = $this->prophesize(User::class);
+
+ $violations = $this->getMockBuilder(EntityConstraintViolationList::class)
+ ->setConstructorArgs([$entity->reveal(), [$violation1->reveal(), $violation2->reveal()]])
+ ->setMethods(['filterByFieldAccess'])
+ ->getMock();
+
+ $violations->expects($this->once())
+ ->method('filterByFieldAccess')
+ ->will($this->returnValue([]));
+
+ $entity->validate()->willReturn($violations);
+
+ $trait = $this->getMockForTrait('Drupal\rest\Plugin\rest\resource\EntityResourceValidationTrait');
+
+ $method = new \ReflectionMethod($trait, 'validate');
+ $method->setAccessible(TRUE);
+
+ $this->setExpectedException(UnprocessableEntityHttpException::class);
+
+ $method->invoke($trait, $entity->reveal());
+ }
+
+}