diff --git a/composer.lock b/composer.lock
index 41f98eb..f94decc 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,8 +4,8 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "hash": "ac82fae1f7095370dc4c7299aa637a30",
-    "content-hash": "3faf23edaf51060bfe1830506104ec83",
+    "hash": "6a7dba6ba1b24d45b8d19186eae195f5",
+    "content-hash": "3ecce85585b049d679a3b982fa3b3242",
     "packages": [
         {
             "name": "nikic/php-parser",
diff --git a/src/DetectorFactory.php b/src/DetectorFactory.php
index 62926a8..0eb8e11 100644
--- a/src/DetectorFactory.php
+++ b/src/DetectorFactory.php
@@ -34,7 +34,6 @@
 use SensioLabs\DeprecationDetector\TypeGuessing\SymbolTable\Visitor\SymbolTableVariableResolverVisitor;
 use SensioLabs\DeprecationDetector\TypeGuessing\Symfony\ContainerReader;
 use SensioLabs\DeprecationDetector\Violation\Renderer\ConsoleOutputRenderer;
-use SensioLabs\DeprecationDetector\Violation\Renderer\Html\Renderer;
 use SensioLabs\DeprecationDetector\Violation\Renderer\Html\RendererFactory;
 use SensioLabs\DeprecationDetector\Violation\Renderer\MessageHelper\Message\ClassViolationMessage;
 use SensioLabs\DeprecationDetector\Violation\Renderer\MessageHelper\Message\FunctionViolationMessage;
@@ -294,7 +293,13 @@ private function getViolationFilter(Configuration $configuration)
     /**
      * Renderer.
      */
-    private function getRenderer(Configuration $configuration, $output)
+
+    /**
+     * @param Configuration   $configuration
+     * @param OutputInterface $output
+     * @return ConsoleOutputRenderer|Violation\Renderer\Html\Renderer
+     */
+    private function getRenderer(Configuration $configuration, OutputInterface $output)
     {
         $messageHelper = $this->getMessageHelper();
 
@@ -314,13 +319,13 @@ private function getMessageHelper()
     {
         return new MessageHelper(
             array(
-                new ClassViolationMessage('SensioLabs\DeprecationDetector\FileInfo\Usage\ClassUsage'),
-                new InterfaceViolationMessage('SensioLabs\DeprecationDetector\FileInfo\Usage\InterfaceUsage'),
-                new MethodViolationMessage('SensioLabs\DeprecationDetector\FileInfo\Usage\MethodUsage'),
-                new MethodDefinitionViolationMessage('SensioLabs\DeprecationDetector\FileInfo\MethodDefinition'),
-                new SuperTypeViolationMessage('SensioLabs\DeprecationDetector\FileInfo\Usage\SuperTypeUsage'),
-                new LanguageDeprecationMessage('SensioLabs\DeprecationDetector\FileInfo\Usage\DeprecatedLanguageUsage'),
-                new FunctionViolationMessage('SensioLabs\DeprecationDetector\FileInfo\Usage\FunctionUsage'),
+                new ClassViolationMessage(),
+                new InterfaceViolationMessage(),
+                new MethodViolationMessage(),
+                new MethodDefinitionViolationMessage(),
+                new SuperTypeViolationMessage(),
+                new LanguageDeprecationMessage(),
+                new FunctionViolationMessage(),
             )
         );
     }
@@ -328,6 +333,10 @@ private function getMessageHelper()
     /**
      * DeprecationParser.
      */
+
+    /**
+     * @return DeprecationParser
+     */
     private function getDeprecationParser()
     {
         return new DeprecationParser(
diff --git a/src/Finder/ParsedPhpFileFinder.php b/src/Finder/ParsedPhpFileFinder.php
index 6930dfa..73fd6cf 100644
--- a/src/Finder/ParsedPhpFileFinder.php
+++ b/src/Finder/ParsedPhpFileFinder.php
@@ -78,14 +78,6 @@ public function count()
         return iterator_count(parent::getIterator());
     }
 
-    /**
-     * @return bool
-     */
-    public function hasParserErrors()
-    {
-        return !empty($this->parserErrors);
-    }
-
     /**
      * @return \PhpParser\Error[]
      */
diff --git a/src/RuleSet/Loader/FileLoader.php b/src/RuleSet/Loader/FileLoader.php
index 6003c9a..cd2c824 100644
--- a/src/RuleSet/Loader/FileLoader.php
+++ b/src/RuleSet/Loader/FileLoader.php
@@ -30,8 +30,8 @@ public function loadRuleSet($path)
 
         if (!$ruleSet instanceof RuleSet) {
             throw new CouldNotLoadRuleSetException(sprintf(
-                'Ruleset "$s" is invalid, aborting.',
-                    $path
+                'Ruleset "%s" is invalid, aborting.',
+                $path
                 )
             );
         }
diff --git a/src/Violation/Renderer/MessageHelper/Message/BaseViolationMessage.php b/src/Violation/Renderer/MessageHelper/Message/BaseViolationMessage.php
index 0408fd1..2533578 100644
--- a/src/Violation/Renderer/MessageHelper/Message/BaseViolationMessage.php
+++ b/src/Violation/Renderer/MessageHelper/Message/BaseViolationMessage.php
@@ -18,10 +18,6 @@ public function __construct($usageName)
 
     public function supports(UsageInterface $usage)
     {
-        if ($usage instanceof $this->usageName) {
-            return true;
-        }
-
-        return false;
+        return $usage instanceof $this->usageName;
     }
 }
diff --git a/src/Violation/Renderer/MessageHelper/Message/ClassViolationMessage.php b/src/Violation/Renderer/MessageHelper/Message/ClassViolationMessage.php
index 2129bd7..4b318de 100644
--- a/src/Violation/Renderer/MessageHelper/Message/ClassViolationMessage.php
+++ b/src/Violation/Renderer/MessageHelper/Message/ClassViolationMessage.php
@@ -5,14 +5,13 @@
 use SensioLabs\DeprecationDetector\FileInfo\Usage\ClassUsage;
 use SensioLabs\DeprecationDetector\FileInfo\Usage\UsageInterface;
 
-class ClassViolationMessage extends BaseViolationMessage implements ViolationMessageInterface
+class ClassViolationMessage extends BaseViolationMessage
 {
-    /**
-     * @param string $usageName
-     */
-    public function __construct($usageName)
+    const USAGE_NAME = 'SensioLabs\DeprecationDetector\FileInfo\Usage\ClassUsage';
+
+    public function __construct()
     {
-        parent::__construct($usageName);
+        parent::__construct(self::USAGE_NAME);
     }
 
     public function message(UsageInterface $usage)
diff --git a/src/Violation/Renderer/MessageHelper/Message/FunctionViolationMessage.php b/src/Violation/Renderer/MessageHelper/Message/FunctionViolationMessage.php
index d86a262..811547a 100644
--- a/src/Violation/Renderer/MessageHelper/Message/FunctionViolationMessage.php
+++ b/src/Violation/Renderer/MessageHelper/Message/FunctionViolationMessage.php
@@ -5,14 +5,13 @@
 use SensioLabs\DeprecationDetector\FileInfo\Usage\FunctionUsage;
 use SensioLabs\DeprecationDetector\FileInfo\Usage\UsageInterface;
 
-class FunctionViolationMessage extends BaseViolationMessage implements ViolationMessageInterface
+class FunctionViolationMessage extends BaseViolationMessage
 {
-    /**
-     * @param string $usageName
-     */
-    public function __construct($usageName)
+    const USAGE_NAME = 'SensioLabs\DeprecationDetector\FileInfo\Usage\FunctionUsage';
+
+    public function __construct()
     {
-        parent::__construct($usageName);
+        parent::__construct(self::USAGE_NAME);
     }
 
     public function message(UsageInterface $usage)
diff --git a/src/Violation/Renderer/MessageHelper/Message/InterfaceViolationMessage.php b/src/Violation/Renderer/MessageHelper/Message/InterfaceViolationMessage.php
index 7383960..57b1143 100644
--- a/src/Violation/Renderer/MessageHelper/Message/InterfaceViolationMessage.php
+++ b/src/Violation/Renderer/MessageHelper/Message/InterfaceViolationMessage.php
@@ -5,14 +5,13 @@
 use SensioLabs\DeprecationDetector\FileInfo\Usage\InterfaceUsage;
 use SensioLabs\DeprecationDetector\FileInfo\Usage\UsageInterface;
 
-class InterfaceViolationMessage extends BaseViolationMessage implements ViolationMessageInterface
+class InterfaceViolationMessage extends BaseViolationMessage
 {
-    /**
-     * @param string $usageName
-     */
-    public function __construct($usageName)
+    const USAGE_NAME = 'SensioLabs\DeprecationDetector\FileInfo\Usage\InterfaceUsage';
+
+    public function __construct()
     {
-        parent::__construct($usageName);
+        parent::__construct(self::USAGE_NAME);
     }
 
     public function message(UsageInterface $usage)
diff --git a/src/Violation/Renderer/MessageHelper/Message/LanguageDeprecationMessage.php b/src/Violation/Renderer/MessageHelper/Message/LanguageDeprecationMessage.php
index 89895fc..d5aeb85 100644
--- a/src/Violation/Renderer/MessageHelper/Message/LanguageDeprecationMessage.php
+++ b/src/Violation/Renderer/MessageHelper/Message/LanguageDeprecationMessage.php
@@ -5,14 +5,13 @@
 use SensioLabs\DeprecationDetector\FileInfo\Usage\DeprecatedLanguageUsage;
 use SensioLabs\DeprecationDetector\FileInfo\Usage\UsageInterface;
 
-class LanguageDeprecationMessage extends BaseViolationMessage implements ViolationMessageInterface
+class LanguageDeprecationMessage extends BaseViolationMessage
 {
-    /**
-     * @param string $usageName
-     */
-    public function __construct($usageName)
+    const USAGE_NAME = 'SensioLabs\DeprecationDetector\FileInfo\Usage\DeprecatedLanguageUsage';
+
+    public function __construct()
     {
-        parent::__construct($usageName);
+        parent::__construct(self::USAGE_NAME);
     }
 
     public function message(UsageInterface $usage)
diff --git a/src/Violation/Renderer/MessageHelper/Message/MethodDefinitionViolationMessage.php b/src/Violation/Renderer/MessageHelper/Message/MethodDefinitionViolationMessage.php
index ac270a0..1dadfc3 100644
--- a/src/Violation/Renderer/MessageHelper/Message/MethodDefinitionViolationMessage.php
+++ b/src/Violation/Renderer/MessageHelper/Message/MethodDefinitionViolationMessage.php
@@ -5,14 +5,13 @@
 use SensioLabs\DeprecationDetector\FileInfo\MethodDefinition;
 use SensioLabs\DeprecationDetector\FileInfo\Usage\UsageInterface;
 
-class MethodDefinitionViolationMessage extends BaseViolationMessage implements ViolationMessageInterface
+class MethodDefinitionViolationMessage extends BaseViolationMessage
 {
-    /**
-     * @param string $usageName
-     */
-    public function __construct($usageName)
+    const USAGE_NAME = 'SensioLabs\DeprecationDetector\FileInfo\MethodDefinition';
+
+    public function __construct()
     {
-        parent::__construct($usageName);
+        parent::__construct(self::USAGE_NAME);
     }
 
     public function message(UsageInterface $usage)
diff --git a/src/Violation/Renderer/MessageHelper/Message/MethodViolationMessage.php b/src/Violation/Renderer/MessageHelper/Message/MethodViolationMessage.php
index 1946184..070637c 100644
--- a/src/Violation/Renderer/MessageHelper/Message/MethodViolationMessage.php
+++ b/src/Violation/Renderer/MessageHelper/Message/MethodViolationMessage.php
@@ -5,14 +5,13 @@
 use SensioLabs\DeprecationDetector\FileInfo\Usage\MethodUsage;
 use SensioLabs\DeprecationDetector\FileInfo\Usage\UsageInterface;
 
-class MethodViolationMessage extends BaseViolationMessage implements ViolationMessageInterface
+class MethodViolationMessage extends BaseViolationMessage
 {
-    /**
-     * @param string $usageName
-     */
-    public function __construct($usageName)
+    const USAGE_NAME = 'SensioLabs\DeprecationDetector\FileInfo\Usage\MethodUsage';
+
+    public function __construct()
     {
-        parent::__construct($usageName);
+        parent::__construct(self::USAGE_NAME);
     }
 
     public function message(UsageInterface $usage)
diff --git a/src/Violation/Renderer/MessageHelper/Message/SuperTypeViolationMessage.php b/src/Violation/Renderer/MessageHelper/Message/SuperTypeViolationMessage.php
index d622f6c..489fcde 100644
--- a/src/Violation/Renderer/MessageHelper/Message/SuperTypeViolationMessage.php
+++ b/src/Violation/Renderer/MessageHelper/Message/SuperTypeViolationMessage.php
@@ -5,14 +5,13 @@
 use SensioLabs\DeprecationDetector\FileInfo\Usage\SuperTypeUsage;
 use SensioLabs\DeprecationDetector\FileInfo\Usage\UsageInterface;
 
-class SuperTypeViolationMessage extends BaseViolationMessage implements ViolationMessageInterface
+class SuperTypeViolationMessage extends BaseViolationMessage
 {
-    /**
-     * @param string $usageName
-     */
-    public function __construct($usageName)
+    const USAGE_NAME = 'SensioLabs\DeprecationDetector\FileInfo\Usage\SuperTypeUsage';
+
+    public function __construct()
     {
-        parent::__construct($usageName);
+        parent::__construct(self::USAGE_NAME);
     }
 
     public function message(UsageInterface $usage)
diff --git a/tests/Console/Command/CheckCommandTest.php b/tests/Console/Command/CheckCommandTest.php
index b3935de..cd9acba 100644
--- a/tests/Console/Command/CheckCommandTest.php
+++ b/tests/Console/Command/CheckCommandTest.php
@@ -96,7 +96,7 @@ public function testCommandWithFilterMethodOption()
      * @param string $rulesetPath    ruleset argument
      * @param array $options Further options as key => value array
      */
-    private function executeCommand($sourcePath, $rulesetPath, $options = array())
+    private function executeCommand($sourcePath, $rulesetPath, array $options = array())
     {
         $arguments = array_merge(
             $options,
diff --git a/tests/DeprecationDetectorTest.php b/tests/DeprecationDetectorTest.php
index 87d8b72..fbd9c3d 100644
--- a/tests/DeprecationDetectorTest.php
+++ b/tests/DeprecationDetectorTest.php
@@ -51,7 +51,6 @@ public function testCheckForDeprecations()
 
         $deprecationFinder = $this->prophesize('SensioLabs\DeprecationDetector\Finder\ParsedPhpFileFinder');
         $deprecationFinder->in($sourceArg)->willReturn($deprecationFinder->reveal());
-        $deprecationFinder->hasParserErrors()->willReturn(false);
         $deprecationFinder->count()->willReturn($fileCount);
         $deprecationFinder->getParserErrors()->willReturn(array());
 
diff --git a/tests/FileInfo/PhpFileInfoTest.php b/tests/FileInfo/PhpFileInfoTest.php
index 8016003..df8a611 100644
--- a/tests/FileInfo/PhpFileInfoTest.php
+++ b/tests/FileInfo/PhpFileInfoTest.php
@@ -162,7 +162,7 @@ public function testHasAndGetSuperTypeUsageByClass()
     {
         $fileInfo = PhpFileInfo::create($this->prophesize('Symfony\Component\Finder\SplFileInfo')->reveal());
         $this->assertFalse($fileInfo->hasSuperTypeUsageByClass('someClass'));
-        $this->assertSame(null, $fileInfo->getSuperTypeUsageByClass('someClass'));
+        $this->assertNull($fileInfo->getSuperTypeUsageByClass('someClass'));
 
         $superTypeUsage = $this->prophesize('SensioLabs\DeprecationDetector\FileInfo\Usage\SuperTypeUsage');
         $superTypeUsage->className()->willReturn('someClass');
diff --git a/tests/TypeGuessing/SymbolTable/TableScopeTest.php b/tests/TypeGuessing/SymbolTable/TableScopeTest.php
index 135317b..a94b383 100644
--- a/tests/TypeGuessing/SymbolTable/TableScopeTest.php
+++ b/tests/TypeGuessing/SymbolTable/TableScopeTest.php
@@ -25,7 +25,7 @@ public function testFindSymbolReturnsNull()
     {
         $scope = new TableScope(TableScope::CLASS_LIKE_SCOPE);
 
-        $this->assertSame(null, $scope->findSymbol('var'));
+        $this->assertNull($scope->findSymbol('var'));
     }
 
     public function testSetAndFindSymbol()
diff --git a/tests/Violation/Renderer/MessageHelper/Message/BaseViolationMessageImplementation.php b/tests/Violation/Renderer/MessageHelper/Message/BaseViolationMessageImplementation.php
index 0e0ce5d..53649a3 100644
--- a/tests/Violation/Renderer/MessageHelper/Message/BaseViolationMessageImplementation.php
+++ b/tests/Violation/Renderer/MessageHelper/Message/BaseViolationMessageImplementation.php
@@ -7,11 +7,6 @@
 
 class BaseViolationMessageImplementation extends BaseViolationMessage
 {
-    public function __construct($usageName)
-    {
-        parent::__construct($usageName);
-    }
-
     public function message(UsageInterface $usage)
     {
     }
diff --git a/tests/Violation/ViolationFilter/MethodViolationFilterTest.php b/tests/Violation/ViolationFilter/MethodViolationFilterTest.php
index 86e6e6b..9bfcc4d 100644
--- a/tests/Violation/ViolationFilter/MethodViolationFilterTest.php
+++ b/tests/Violation/ViolationFilter/MethodViolationFilterTest.php
@@ -15,7 +15,7 @@ class MethodViolationFilterTest extends \PHPUnit_Framework_TestCase
 
     public function setUp()
     {
-        parent::setup();
+        parent::setUp();
         $this->methodViolationFilter = new MethodViolationFilter($this->filterList);
     }