Made test properties to be private instead of protected

module/CLI/test/Command/Api/DisableKeyCommandTest.php

@@ -14,9 +14,9 @@ use Symfony\Component\Console\Tester\CommandTester;
 class DisableKeyCommandTest extends TestCase
 {
     /** @var CommandTester */
-    protected $commandTester;
+    private $commandTester;
     /** @var ObjectProphecy */
-    protected $apiKeyService;
+    private $apiKeyService;
 
     public function setUp()
     {

module/CLI/test/Command/Api/GenerateKeyCommandTest.php

@@ -16,9 +16,9 @@ use Symfony\Component\Console\Tester\CommandTester;
 class GenerateKeyCommandTest extends TestCase
 {
     /** @var CommandTester */
-    protected $commandTester;
+    private $commandTester;
     /** @var ObjectProphecy */
-    protected $apiKeyService;
+    private $apiKeyService;
 
     public function setUp()
     {

module/CLI/test/Command/Api/ListKeysCommandTest.php

@@ -14,9 +14,9 @@ use Symfony\Component\Console\Tester\CommandTester;
 class ListKeysCommandTest extends TestCase
 {
     /** @var CommandTester */
-    protected $commandTester;
+    private $commandTester;
     /** @var ObjectProphecy */
-    protected $apiKeyService;
+    private $apiKeyService;
 
     public function setUp()
     {

module/CLI/test/Command/Config/GenerateCharsetCommandTest.php

@@ -14,7 +14,7 @@ use function str_split;
 class GenerateCharsetCommandTest extends TestCase
 {
     /** @var CommandTester */
-    protected $commandTester;
+    private $commandTester;
 
     public function setUp()
     {

module/CLI/test/Command/ShortUrl/GeneratePreviewCommandTest.php

@@ -21,7 +21,7 @@ use function substr_count;
 class GeneratePreviewCommandTest extends TestCase
 {
     /** @var CommandTester */
-    protected $commandTester;
+    private $commandTester;
     /** @var ObjectProphecy */
     private $previewGenerator;
     /** @var ObjectProphecy */

module/CLI/test/Command/ShortUrl/GenerateShortUrlCommandTest.php

@@ -18,9 +18,9 @@ use Symfony\Component\Console\Tester\CommandTester;
 class GenerateShortUrlCommandTest extends TestCase
 {
     /** @var CommandTester */
-    protected $commandTester;
+    private $commandTester;
     /** @var ObjectProphecy */
-    protected $urlShortener;
+    private $urlShortener;
 
     public function setUp()
     {

module/CLI/test/Command/ShortUrl/GetVisitsCommandTest.php

@@ -21,9 +21,9 @@ use function strpos;
 class GetVisitsCommandTest extends TestCase
 {
     /** @var CommandTester */
-    protected $commandTester;
+    private $commandTester;
     /** @var ObjectProphecy */
-    protected $visitsTracker;
+    private $visitsTracker;
 
     public function setUp()
     {

module/CLI/test/Command/ShortUrl/ListShortUrlsCommandTest.php

@@ -17,9 +17,9 @@ use Zend\Paginator\Paginator;
 class ListShortUrlsCommandTest extends TestCase
 {
     /** @var CommandTester */
-    protected $commandTester;
+    private $commandTester;
     /** @var ObjectProphecy */
-    protected $shortUrlService;
+    private $shortUrlService;
 
     public function setUp()
     {

module/CLI/test/Command/ShortUrl/ResolveUrlCommandTest.php

@@ -17,9 +17,9 @@ use const PHP_EOL;
 class ResolveUrlCommandTest extends TestCase
 {
     /** @var CommandTester */
-    protected $commandTester;
+    private $commandTester;
     /** @var ObjectProphecy */
-    protected $urlShortener;
+    private $urlShortener;
 
     public function setUp()
     {

module/CLI/test/ConfigProviderTest.php

@@ -9,7 +9,7 @@ use Shlinkio\Shlink\CLI\ConfigProvider;
 class ConfigProviderTest extends TestCase
 {
     /** @var ConfigProvider */
-    protected $configProvider;
+    private $configProvider;
 
     public function setUp()
     {

module/CLI/test/Factory/ApplicationFactoryTest.php

@@ -16,7 +16,7 @@ use function array_merge;
 class ApplicationFactoryTest extends TestCase
 {
     /** @var ApplicationFactory */
-    protected $factory;
+    private $factory;
 
     public function setUp()
     {