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

    public function testTransaction()
    {
        $this->connection->beginTransaction(Argument::type('array'))->shouldBeCalled()->willReturn(['transaction' => '1234']);
        $this->datastore->setConnection($this->connection->reveal());
        $t = $this->datastore->transaction();
        $this->assertInstanceOf(Transaction::class, $t);
    }