style: convert string class names to constants (#1252)

* style: convert string class names to constants

* style: fix php-cs-fixer

---------

Co-authored-by: Jonathan Beliën <jbelien@users.noreply.github.com>

Author: fbuchlak

Tests/GeoIP2AdapterTest.php

@@ -31,7 +31,7 @@ class GeoIP2AdapterTest extends TestCase
      */
     public static function setUpBeforeClass(): void
     {
-        if (false === class_exists('\GeoIp2\Database\Reader')) {
+        if (false === class_exists(\GeoIp2\Database\Reader::class)) {
             throw new \RuntimeException("The maxmind's lib 'geoip2/geoip2' is required to run this test.");
         }
     }
@@ -126,7 +126,7 @@ public function testReaderResponseIsJsonEncoded(): void
      */
     protected function getGeoIP2ProviderMock()
     {
-        $mock = $this->getMockBuilder('\GeoIp2\ProviderInterface')->getMock();
+        $mock = $this->getMockBuilder(\GeoIp2\ProviderInterface::class)->getMock();
 
         return $mock;
     }

Tests/GeoIP2Test.php

@@ -63,12 +63,12 @@ public function testGeocodeWithLocalhostIPv4(): void
     {
         $results = $this->provider->geocodeQuery(GeocodeQuery::create('127.0.0.1'));
 
-        $this->assertInstanceOf('Geocoder\Model\AddressCollection', $results);
+        $this->assertInstanceOf(\Geocoder\Model\AddressCollection::class, $results);
         $this->assertCount(1, $results);
 
         /** @var Location $result */
         $result = $results->first();
-        $this->assertInstanceOf('\Geocoder\Model\Address', $result);
+        $this->assertInstanceOf(\Geocoder\Model\Address::class, $result);
         $this->assertEquals('localhost', $result->getLocality());
         $this->assertEquals('localhost', $result->getCountry()->getName());
     }
@@ -172,12 +172,12 @@ public function testRetrievingGeodata(string $address, string $adapterResponse,
 
         $results = $provider->geocodeQuery(GeocodeQuery::create($address));
 
-        $this->assertInstanceOf('Geocoder\Model\AddressCollection', $results);
+        $this->assertInstanceOf(\Geocoder\Model\AddressCollection::class, $results);
         $this->assertCount(1, $results);
 
         /** @var Location $result */
         $result = $results->first();
-        $this->assertInstanceOf('\Geocoder\Model\Address', $result);
+        $this->assertInstanceOf(\Geocoder\Model\Address::class, $result);
         if (isset($expectedGeodata['latitude'])) {
             $this->assertEquals($expectedGeodata['latitude'], $result->getCoordinates()->getLatitude());
             $this->assertEquals($expectedGeodata['longitude'], $result->getCoordinates()->getLongitude());