Update to support phpunit 6.x

Author: Nyholm

tests/unit/AbstractTest.php

@@ -12,14 +12,15 @@
 use InfluxDB\Database;
 use InfluxDB\Driver\Guzzle as GuzzleDriver;
 use InfluxDB\ResultSet;
+use PHPUnit\Framework\TestCase;
 use PHPUnit_Framework_MockObject_MockObject;
 use GuzzleHttp\Client as GuzzleClient;
 use GuzzleHttp\Psr7\Response;
 
 /**
  * @property mixed resultData
  */
-abstract class AbstractTest extends \PHPUnit_Framework_TestCase
+abstract class AbstractTest extends TestCase
 {
 
     /** @var  Client|PHPUnit_Framework_MockObject_MockObject $client */

tests/unit/AdminTest.php

@@ -12,8 +12,6 @@
 
 class AdminTest extends AbstractTest
 {
-
-
     /**
      *
      */

tests/unit/ClientTest.php

@@ -8,7 +8,6 @@
 
 class ClientTest extends AbstractTest
 {
-
     /**
      *
      */

tests/unit/DatabaseTest.php

@@ -6,11 +6,9 @@
 use InfluxDB\Database;
 use InfluxDB\Point;
 use InfluxDB\ResultSet;
-use PHPUnit\Framework\Error\Deprecated;
 
 class DatabaseTest extends AbstractTest
 {
-
     /**
      * @var string
      */

tests/unit/PointTest.php

@@ -4,8 +4,9 @@
 
 
 use InfluxDB\Point;
+use PHPUnit\Framework\TestCase;
 
-class PointTest extends \PHPUnit_Framework_TestCase
+class PointTest extends TestCase
 {
     public function testPointStringRepresentation()
     {

tests/unit/ResultSetTest.php

@@ -2,8 +2,9 @@
 namespace InfluxDB\Test;
 
 use InfluxDB\ResultSet;
+use PHPUnit\Framework\TestCase;
 
-class ResultSetTest extends \PHPUnit_Framework_TestCase
+class ResultSetTest extends TestCase
 {
     /** @var ResultSet  $resultSet*/
     protected $resultSet;