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/IpInfoDbTest.php

@@ -62,12 +62,12 @@ public function testGeocodeWithLocalhostIPv4(): void
         $provider = new IpInfoDb($this->getMockedHttpClient(), 'api_key');
         $results = $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);
         $this->assertNull($result->getCoordinates());
 
         $this->assertNull($result->getPostalCode());
@@ -112,12 +112,12 @@ public function testGeocodeWithRealIPv4(): void
         $provider = new IpInfoDb($this->getHttpClient($_SERVER['IPINFODB_API_KEY']), $_SERVER['IPINFODB_API_KEY']);
         $results = $provider->geocodeQuery(GeocodeQuery::create('74.125.45.100'));
 
-        $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->assertEqualsWithDelta(36.154, $result->getCoordinates()->getLatitude(), 0.001);
         $this->assertEqualsWithDelta(-95.9928, $result->getCoordinates()->getLongitude(), 0.001);
         $this->assertEquals(74101, $result->getPostalCode());
@@ -154,12 +154,12 @@ public function testGetGeocodedDataWithCountryPrecision(): void
         $provider = new IpInfoDb($this->getHttpClient($_SERVER['IPINFODB_API_KEY']), $_SERVER['IPINFODB_API_KEY'], 'country');
         $results = $provider->geocodeQuery(GeocodeQuery::create('74.125.45.100'));
 
-        $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);
         $this->assertNull($result->getCoordinates());
 
         $this->assertNull($result->getPostalCode());