Google\Cloud\Tests\Datastore\DatastoreClientTest::testUpdate PHP Method

    public function testUpdate()
    {
        $this->operation->commit(Argument::type('array'), Argument::type('array'))->shouldBeCalled()->willReturn(['mutationResults' => [['version' => '1234']]]);
        $this->operation->mutation(Argument::exact('update'), Argument::type(Entity::class), Argument::exact(Entity::class), Argument::exact(null))->shouldBeCalled();
        $this->operation->checkOverwrite(Argument::type('array'), Argument::type('bool'))->shouldBeCalled();
        $this->datastore->setOperation($this->operation->reveal());
        $e = $this->prophesize(Entity::class);
        $res = $this->datastore->update($e->reveal());
        $this->assertEquals($res, '1234');
    }