diff --git a/.travis.yml b/.travis.yml
index 31098ec..5416311 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,11 +2,8 @@ language: php
 
 sudo: false
 
-matrix:
-  include:
-    - php: 7.1
-      # add variables to enable coverage, coding standard check and static analysis
-      env: PHPUNIT_FLAGS="--coverage-clover coverage.xml" CHECK_CS=1 RUN_PHPSTAN=1
+php:
+  - 7.1
 
 install:
   # install composer dependencies
@@ -14,21 +11,21 @@ install:
 
 script:
   # run tests
-  - vendor/bin/phpunit $PHPUNIT_FLAGS
+  - vendor/bin/phpunit --coverage-clover coverage.xml
+  # turn off XDebug
+  - phpenv config-rm xdebug.ini || return 0
   # check coding standard (defined in composer.json "scripts" section)
-  - if [[ $CHECK_CS = 1 ]]; then composer check-cs; fi
+  - composer check-cs
   # check with phpstan (defined in composer.json "scripts" section)
-  - if [[ $RUN_PHPSTAN = 1 ]]; then composer phpstan; fi
+  - composer phpstan
   # run PHP_CodeSniffer with ruleset
   - vendor/bin/phpcs src tests -sp --standard=src/ObjectCalisthenics/ruleset.xml --extensions=php
 
 after_script:
   # upload coverage.xml file to Coveralls to analyze it
   - |
-   if [[ PHPUNIT_FLAGS != "" ]]; then
-     wget https://github.com/satooshi/php-coveralls/releases/download/v1.0.1/coveralls.phar
-     php coveralls.phar --verbose
-   fi
+    wget https://github.com/satooshi/php-coveralls/releases/download/v1.0.1/coveralls.phar
+    php coveralls.phar --verbose
 
 # do not send success notifications, they have no value
 notifications:
diff --git a/composer.json b/composer.json
index 8da2618..41bdac4 100644
--- a/composer.json
+++ b/composer.json
@@ -5,16 +5,16 @@
     "type": "phpcodesniffer-standard",
     "require": {
         "php": "^7.1",
-        "squizlabs/php_codesniffer": "^3.0.1",
+        "squizlabs/php_codesniffer": "^3.1",
         "nette/utils": "^2.4"
     },
     "require-dev": {
-        "phpunit/phpunit": "^6.0",
-        "phpstan/phpstan": "^0.7",
+        "phpunit/phpunit": "^6.4",
+        "phpstan/phpstan": "^0.8",
         "tracy/tracy": "^2.4",
-        "symplify/easy-coding-standard": "^2.0",
-        "symplify/coding-standard": "^2.0",
-        "slevomat/coding-standard": "^3.0"
+        "symplify/easy-coding-standard": "^2.5",
+        "symplify/coding-standard": "^2.5",
+        "slevomat/coding-standard": "^4.0"
     },
     "autoload": {
         "psr-4": {
@@ -28,8 +28,8 @@
     },
     "scripts": {
         "complete-check": ["@phpstan", "@check-cs", "phpunit"],
-        "phpstan": "phpstan analyze src --level 7 --configuration phpstan.neon",
-        "check-cs": "easy-coding-standard check src tests",
-        "fix-cs": "easy-coding-standard check src tests --fix"
+        "phpstan": "phpstan analyze src --level max --configuration phpstan.neon",
+        "check-cs": "ecs check src tests",
+        "fix-cs": "ecs check src tests --fix"
     }
 }
diff --git a/easy-coding-standard.neon b/easy-coding-standard.neon
index b5723a3..c11e228 100644
--- a/easy-coding-standard.neon
+++ b/easy-coding-standard.neon
@@ -1,3 +1,14 @@
+includes:
+    - vendor/symplify/easy-coding-standard/config/symfony-checkers.neon
+    - vendor/symplify/easy-coding-standard/config/php54-checkers.neon
+    - vendor/symplify/easy-coding-standard/config/php70-checkers.neon
+    - vendor/symplify/easy-coding-standard/config/php71-checkers.neon
+    # custom
+    - vendor/symplify/easy-coding-standard/config/symplify-checkers.neon
+    - vendor/symplify/easy-coding-standard/config/common.neon
+    - vendor/symplify/easy-coding-standard/config/spaces.neon
+
+
 checkers:
     # All rules with default values
 
@@ -33,244 +44,35 @@ checkers:
     - ObjectCalisthenics\Sniffs\Classes\ForbiddenPublicPropertySniff
     - ObjectCalisthenics\Sniffs\NamingConventions\NoSetterSniff
 
-    # Classes
-    - PHP_CodeSniffer\Standards\Generic\Sniffs\Classes\DuplicateClassNameSniff
-    - PHP_CodeSniffer\Standards\PSR2\Sniffs\Classes\PropertyDeclarationSniff
-    - PHP_CodeSniffer\Standards\Squiz\Sniffs\Classes\ValidClassNameSniff
-    - PHP_CodeSniffer\Standards\Squiz\Sniffs\Classes\LowercaseClassKeywordsSniff
-
-    # Code Analysis
-    - PHP_CodeSniffer\Standards\Generic\Sniffs\CodeAnalysis\EmptyStatementSniff
-    - PHP_CodeSniffer\Standards\Generic\Sniffs\CodeAnalysis\JumbledIncrementerSniff
-    - PHP_CodeSniffer\Standards\Generic\Sniffs\CodeAnalysis\UnconditionalIfStatementSniff
-    - PHP_CodeSniffer\Standards\Generic\Sniffs\CodeAnalysis\UselessOverridingMethodSniff
+    PhpCsFixer\Fixer\ControlStructure\YodaStyleFixer:
+        equal: false
+        identical: false
+        less_and_greater: false
 
-    # Control Structures
-    - PHP_CodeSniffer\Standards\Generic\Sniffs\ControlStructures\InlineControlStructureSniff
-    - PHP_CodeSniffer\Standards\PEAR\Sniffs\ControlStructures\MultiLineConditionSniff
-    - PHP_CodeSniffer\Standards\Squiz\Sniffs\ControlStructures\ControlSignatureSniff
-    - PHP_CodeSniffer\Standards\PSR2\Sniffs\ControlStructures\ElseIfDeclarationSniff
-    - PHP_CodeSniffer\Standards\Squiz\Sniffs\ControlStructures\ForEachLoopDeclarationSniff
-    - PHP_CodeSniffer\Standards\Squiz\Sniffs\ControlStructures\ForLoopDeclarationSniff
-    - PHP_CodeSniffer\Standards\Squiz\Sniffs\ControlStructures\LowercaseDeclarationSniff
-
-    # Files
-    - PHP_CodeSniffer\Standards\Generic\Sniffs\Files\ByteOrderMarkSniff
+    # Metrics
     PHP_CodeSniffer\Standards\Generic\Sniffs\Files\LineLengthSniff:
-        lineLimit: 120
         absoluteLineLimit: 120
-    - PHP_CodeSniffer\Standards\Generic\Sniffs\Files\OneClassPerFileSniff
-    - PHP_CodeSniffer\Standards\Generic\Sniffs\Files\OneInterfacePerFileSniff
-    - PHP_CodeSniffer\Standards\PSR2\Sniffs\Files\EndFileNewlineSniff
-    - PHP_CodeSniffer\Standards\Zend\Sniffs\Files\ClosingTagSniff
-
-    # Formatting
-    - PHP_CodeSniffer\Standards\Generic\Sniffs\Formatting\SpaceAfterCastSniff
-
-    - PHP_CodeSniffer\Standards\Generic\Sniffs\Functions\FunctionCallArgumentSpacingSniff
-    - PHP_CodeSniffer\Standards\PEAR\Sniffs\Functions\ValidDefaultValueSniff
-    - PHP_CodeSniffer\Standards\Squiz\Sniffs\Functions\FunctionDeclarationSniff
-    - PHP_CodeSniffer\Standards\Squiz\Sniffs\Functions\MultiLineFunctionDeclarationSniff
-    - PHP_CodeSniffer\Standards\Squiz\Sniffs\Functions\LowercaseFunctionKeywordsSniff
-
-    # Metrics
-    - PHP_CodeSniffer\Standards\Generic\Sniffs\Metrics\CyclomaticComplexitySniff
-    - PHP_CodeSniffer\Standards\PSR2\Sniffs\Methods\MethodDeclarationSniff
-
-    # Naming Conventions
-    - PHP_CodeSniffer\Standards\Generic\Sniffs\NamingConventions\UpperCaseConstantNameSniff
-    - PHP_CodeSniffer\Standards\Generic\Sniffs\NamingConventions\CamelCapsFunctionNameSniff
-
-    # PHP
-    - PHP_CodeSniffer\Standards\Generic\Sniffs\PHP\DisallowShortOpenTagSniff
-    - PHP_CodeSniffer\Standards\MySource\Sniffs\PHP\EvalObjectFactorySniff
-    - PHP_CodeSniffer\Standards\MySource\Sniffs\PHP\GetRequestDataSniff
-    - PHP_CodeSniffer\Standards\Squiz\Sniffs\PHP\NonExecutableCodeSniff
-
-    # WhiteSpace
-    - PHP_CodeSniffer\Standards\Generic\Sniffs\WhiteSpace\DisallowTabIndentSniff
-    - PHP_CodeSniffer\Standards\Squiz\Sniffs\WhiteSpace\LanguageConstructSpacingSniff
-    - PHP_CodeSniffer\Standards\Squiz\Sniffs\WhiteSpace\ScopeKeywordSpacingSniff
-    PHP_CodeSniffer\Standards\Squiz\Sniffs\WhiteSpace\SuperfluousWhitespaceSniff:
-        ignoreBlankLines: false
-
-    # Commenting
-    - Symplify\CodingStandard\Sniffs\Commenting\VarPropertyCommentSniff
-
-    # Control Structures
-    - Symplify\CodingStandard\Sniffs\ControlStructures\NewClassSniff
-
-    # Debug
-    - Symplify\CodingStandard\Sniffs\Debug\DebugFunctionCallSniff
-
-    # Namespaces
-    - Symplify\CodingStandard\Sniffs\Namespaces\ClassNamesWithoutPreSlashSniff
-    - PhpCsFixer\Fixer\NamespaceNotation\SingleBlankLineBeforeNamespaceFixer
-
-    # Naming
-    - Symplify\CodingStandard\Sniffs\Naming\AbstractClassNameSniff
-    - Symplify\CodingStandard\Sniffs\Naming\InterfaceNameSniff
-    - Symplify\CodingStandard\Sniffs\Naming\TraitNameSniff
+    PHP_CodeSniffer\Standards\Generic\Sniffs\Metrics\CyclomaticComplexitySniff:
+        absoluteComplexity: 4
+    PHP_CodeSniffer\Standards\Generic\Sniffs\Metrics\NestingLevelSniff:
+        absoluteNestingLevel: 2
 
     # Slevomat
-    - SlevomatCodingStandard\Sniffs\Classes\ClassConstantVisibilitySniff
     - SlevomatCodingStandard\Sniffs\Classes\UnusedPrivateElementsSniff
-    - SlevomatCodingStandard\Sniffs\Commenting\ForbiddenAnnotationsSniff
-    - SlevomatCodingStandard\Sniffs\ControlStructures\DisallowEqualOperatorsSniff
-    - SlevomatCodingStandard\Sniffs\ControlStructures\YodaComparisonSniff
-    - SlevomatCodingStandard\Sniffs\Exceptions\DeadCatchSniff
     - SlevomatCodingStandard\Sniffs\Exceptions\ReferenceThrowableOnlySniff
-    - SlevomatCodingStandard\Sniffs\TypeHints\LongTypeHintsSniff
-    - SlevomatCodingStandard\Sniffs\TypeHints\ParameterTypeHintSpacingSniff
-    - SlevomatCodingStandard\Sniffs\TypeHints\NullableTypeForNullDefaultValueSniff
-    - SlevomatCodingStandard\Sniffs\TypeHints\ReturnTypeHintSpacingSniff
-    # disable for temp bug in Symplify\EasyCodingStandard
     SlevomatCodingStandard\Sniffs\TypeHints\TypeHintDeclarationSniff:
-        usefulAnnotations:
-            - @todo
-            - @dataProvider
-            - @expectedException
-    - SlevomatCodingStandard\Sniffs\Namespaces\AlphabeticallySortedUsesSniff
-    - SlevomatCodingStandard\Sniffs\Namespaces\DisallowGroupUseSniff
-    - SlevomatCodingStandard\Sniffs\Namespaces\MultipleUsesPerLineSniff
-    - SlevomatCodingStandard\Sniffs\Namespaces\ReferenceUsedNamesOnlySniff
-    - SlevomatCodingStandard\Sniffs\Namespaces\UseDoesNotStartWithBackslashSniff
-    - SlevomatCodingStandard\Sniffs\Namespaces\UseFromSameNamespaceSniff
-
-    PhpCsFixer\Fixer\Operator\ConcatSpaceFixer:
-        spacing: one
-    PhpCsFixer\Fixer\ArrayNotation\ArraySyntaxFixer:
-        syntax: short
-    - PhpCsFixer\Fixer\Basic\Psr4Fixer
-    - PhpCsFixer\Fixer\ClassNotation\OrderedClassElementsFixer
-    - PhpCsFixer\Fixer\LanguageConstruct\DirConstantFixer
-    - PhpCsFixer\Fixer\CastNotation\ModernizeTypesCastingFixer
-    - PhpCsFixer\Fixer\Strict\DeclareStrictTypesFixer
-    - PhpCsFixer\Fixer\Semicolon\SemicolonAfterInstructionFixer
-    - PhpCsFixer\Fixer\ReturnNotation\SimplifiedNullReturnFixer
-    - PhpCsFixer\Fixer\Operator\NotOperatorWithSuccessorSpaceFixer
-    - PhpCsFixer\Fixer\ControlStructure\NoUselessElseFixer
-    - PhpCsFixer\Fixer\ReturnNotation\NoUselessReturnFixer
-    - PhpCsFixer\Fixer\Import\OrderedImportsFixer
-    - PhpCsFixer\Fixer\LanguageConstruct\CombineConsecutiveUnsetsFixer
-    - PhpCsFixer\Fixer\Strict\StrictComparisonFixer
-    - PhpCsFixer\Fixer\PhpTag\NoShortEchoTagFixer
-    - PhpCsFixer\Fixer\Alias\EregToPregFixer
-    - PhpCsFixer\Fixer\Phpdoc\GeneralPhpdocAnnotationRemoveFixer
-
-    # PHPUnit
-    - PhpCsFixer\Fixer\PhpUnit\PhpUnitStrictFixer
-
-    # PSR1 (official)
-    - PhpCsFixer\Fixer\Basic\EncodingFixer
-    - PhpCsFixer\Fixer\PhpTag\FullOpeningTagFixer
-
-    # PSR2 (official)
-    - PhpCsFixer\Fixer\NamespaceNotation\BlankLineAfterNamespaceFixer
-    - PhpCsFixer\Fixer\ClassNotation\ClassDefinitionFixer
-    - PhpCsFixer\Fixer\ControlStructure\ElseifFixer
-    - PhpCsFixer\Fixer\FunctionNotation\FunctionDeclarationFixer
-    - PhpCsFixer\Fixer\Whitespace\IndentationTypeFixer
-    - PhpCsFixer\Fixer\Whitespace\LineEndingFixer
-    - PhpCsFixer\Fixer\Casing\LowercaseKeywordsFixer
-    - PhpCsFixer\Fixer\FunctionNotation\MethodArgumentSpaceFixer
-    - PhpCsFixer\Fixer\PhpTag\NoClosingTagFixer
-    - PhpCsFixer\Fixer\FunctionNotation\NoSpacesAfterFunctionNameFixer
-    - PhpCsFixer\Fixer\Whitespace\NoSpacesInsideParenthesisFixer
-    - PhpCsFixer\Fixer\Whitespace\NoTrailingWhitespaceFixer
-    - PhpCsFixer\Fixer\Comment\NoTrailingWhitespaceInCommentFixer
-    - PhpCsFixer\Fixer\Whitespace\SingleBlankLineAtEofFixer
-    - PhpCsFixer\Fixer\Import\SingleImportPerStatementFixer
-    - PhpCsFixer\Fixer\Import\SingleLineAfterImportsFixer
-    - PhpCsFixer\Fixer\ControlStructure\SwitchCaseSemicolonToColonFixer
-    - PhpCsFixer\Fixer\ControlStructure\SwitchCaseSpaceFixer
-
-    # Symfony (official)
-    PhpCsFixer\Fixer\Operator\BinaryOperatorSpacesFixer:
-        align_double_arrow: false
-        align_equals: false
-    - PhpCsFixer\Fixer\ReturnNotation\BlankLineBeforeReturnFixer
-    PhpCsFixer\Fixer\Basic\BracesFixer:
-        allow_single_line_closure: true
-    - PhpCsFixer\Fixer\CastNotation\CastSpacesFixer
-    - PhpCsFixer\Fixer\LanguageConstruct\DeclareEqualNormalizeFixer
-    - PhpCsFixer\Fixer\FunctionNotation\FunctionTypehintSpaceFixer
-    - PhpCsFixer\Fixer\Comment\HashToSlashCommentFixer
-    - PhpCsFixer\Fixer\ControlStructure\IncludeFixer
-    - PhpCsFixer\Fixer\CastNotation\LowercaseCastFixer
-    - PhpCsFixer\Fixer\ClassNotation\MethodSeparationFixer
-    - PhpCsFixer\Fixer\Casing\NativeFunctionCasingFixer
-    - PhpCsFixer\Fixer\ClassNotation\NoBlankLinesAfterClassOpeningFixer
-    - PhpCsFixer\Fixer\Phpdoc\NoBlankLinesAfterPhpdocFixer
-    - PhpCsFixer\Fixer\Comment\NoEmptyCommentFixer
-    - PhpCsFixer\Fixer\Phpdoc\NoEmptyPhpdocFixer
-    - PhpCsFixer\Fixer\Semicolon\NoEmptyStatementFixer
-    PhpCsFixer\Fixer\Whitespace\NoExtraConsecutiveBlankLinesFixer:
-        - curly_brace_block
-        - extra
-        - parenthesis_brace_block
-        - square_brace_block
-        - throw
-        - use
-    - PhpCsFixer\Fixer\Import\NoLeadingImportSlashFixer
-    - PhpCsFixer\Fixer\NamespaceNotation\NoLeadingNamespaceWhitespaceFixer
-    - PhpCsFixer\Fixer\Alias\NoMixedEchoPrintFixer
-    - PhpCsFixer\Fixer\ArrayNotation\NoMultilineWhitespaceAroundDoubleArrowFixer
-    - PhpCsFixer\Fixer\CastNotation\NoShortBoolCastFixer
-    - PhpCsFixer\Fixer\Semicolon\NoSinglelineWhitespaceBeforeSemicolonsFixer
-    - PhpCsFixer\Fixer\Whitespace\NoSpacesAroundOffsetFixer
-    - PhpCsFixer\Fixer\ControlStructure\NoTrailingCommaInListCallFixer
-    - PhpCsFixer\Fixer\ArrayNotation\NoTrailingCommaInSinglelineArrayFixer
-    - PhpCsFixer\Fixer\ControlStructure\NoUnneededControlParenthesesFixer
-    - PhpCsFixer\Fixer\Import\NoUnusedImportsFixer
-    - PhpCsFixer\Fixer\ArrayNotation\NoWhitespaceBeforeCommaInArrayFixer
-    - PhpCsFixer\Fixer\Whitespace\NoWhitespaceInBlankLineFixer
-    - PhpCsFixer\Fixer\ArrayNotation\NormalizeIndexBraceFixer
-    - PhpCsFixer\Fixer\Operator\ObjectOperatorWithoutWhitespaceFixer
-    - PhpCsFixer\Fixer\PhpUnit\PhpUnitFqcnAnnotationFixer
-    - PhpCsFixer\Fixer\Phpdoc\PhpdocAnnotationWithoutDotFixer
-    - PhpCsFixer\Fixer\Phpdoc\PhpdocIndentFixer
-    - PhpCsFixer\Fixer\Phpdoc\PhpdocInlineTagFixer
-    - PhpCsFixer\Fixer\Phpdoc\PhpdocNoAccessFixer
-    - PhpCsFixer\Fixer\Phpdoc\PhpdocNoEmptyReturnFixer
-    - PhpCsFixer\Fixer\Phpdoc\PhpdocNoPackageFixer
-    - PhpCsFixer\Fixer\Phpdoc\PhpdocReturnSelfReferenceFixer
-    - PhpCsFixer\Fixer\Phpdoc\PhpdocScalarFixer
-    - PhpCsFixer\Fixer\Phpdoc\PhpdocSingleLineVarSpacingFixer
-    - PhpCsFixer\Fixer\Phpdoc\PhpdocSummaryFixer
-    - PhpCsFixer\Fixer\Phpdoc\PhpdocToCommentFixer
-    - PhpCsFixer\Fixer\Phpdoc\PhpdocTrimFixer
-    - PhpCsFixer\Fixer\Phpdoc\PhpdocTypesFixer
-    - PhpCsFixer\Fixer\Phpdoc\PhpdocVarWithoutNameFixer
-    - PhpCsFixer\Fixer\Operator\PreIncrementFixer
-    - PhpCsFixer\Fixer\FunctionNotation\ReturnTypeDeclarationFixer
-    - PhpCsFixer\Fixer\ClassNotation\SelfAccessorFixer
-    - PhpCsFixer\Fixer\CastNotation\ShortScalarCastFixer
-    - PhpCsFixer\Fixer\ClassNotation\SingleClassElementPerStatementFixer
-    - PhpCsFixer\Fixer\StringNotation\SingleQuoteFixer
-    - PhpCsFixer\Fixer\Semicolon\SpaceAfterSemicolonFixer
-    - PhpCsFixer\Fixer\Operator\StandardizeNotEqualsFixer
-    - PhpCsFixer\Fixer\Operator\TernaryOperatorSpacesFixer
-    - PhpCsFixer\Fixer\Operator\TernaryToNullCoalescingFixer
-    - PhpCsFixer\Fixer\ArrayNotation\TrimArraySpacesFixer
-    - PhpCsFixer\Fixer\ArrayNotation\WhitespaceAfterCommaInArrayFixer
-
-    # PHP 7.1
-    PhpCsFixer\Fixer\Alias\RandomApiMigrationFixer:
-        mt_rand: random_int
-        rand: random_int
-    PhpCsFixer\Fixer\ClassNotation\VisibilityRequiredFixer:
-        - const
-        - property
-        - method
-
-    # new since PhpCsFixer 2.1/2.2
-    - PhpCsFixer\Fixer\LanguageConstruct\IsNullFixer
-    - PhpCsFixer\Fixer\LanguageConstruct\FunctionToConstantFixer
-    - PhpCsFixer\Fixer\Basic\NonPrintableCharacterFixer
-    - PhpCsFixer\Fixer\Casing\MagicConstantCasingFixer
+        enableEachParameterAndReturnInspection: true
 
 parameters:
     skip:
         SlevomatCodingStandard\Sniffs\TypeHints\TypeHintDeclarationSniff:
-            - src/ObjectCalisthenics/Sniffs/*/*Sniff.php
+            - *src/ObjectCalisthenics/Sniffs/*/*Sniff.php
+
+    exclude_checkers:
+        # Symfony ruleset
+        - PhpCsFixer\Fixer\PhpTag\BlankLineAfterOpeningTagFixer
+        - PhpCsFixer\Fixer\Operator\NewWithBracesFixer
+        - PhpCsFixer\Fixer\Phpdoc\PhpdocAlignFixer
+        # mutually excluded
+        - SlevomatCodingStandard\Sniffs\ControlStructures\DisallowYodaComparisonSniff
+        - PhpCsFixer\Fixer\Operator\UnaryOperatorSpacesFixer
diff --git a/phpstan.neon b/phpstan.neon
index b0fa95f..87c1ada 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -3,3 +3,5 @@ parameters:
         - %currentWorkingDirectory%/vendor/squizlabs/php_codesniffer/autoload.php
     excludes_analyse:
         - **/ObjectCalisthenics/Helper/Slevomat/**
+    ignoreErrors:
+        - '#Method ObjectCalisthenics\\Sniffs\\Metrics\\MaxNestingLevelSniff::register\(\) should return int\[\] but returns \(int\|string\)\[\]#'
diff --git a/src/ObjectCalisthenics/Helper/ClassAnalyzer.php b/src/ObjectCalisthenics/Helper/ClassAnalyzer.php
index c0f50a5..ba3c7da 100644
--- a/src/ObjectCalisthenics/Helper/ClassAnalyzer.php
+++ b/src/ObjectCalisthenics/Helper/ClassAnalyzer.php
@@ -10,7 +10,7 @@ final class ClassAnalyzer
     /**
      * @var mixed[]
      */
-    private static $propertyList;
+    private static $propertyList = [];
 
     public static function getClassMethodCount(File $file, int $position): int
     {
diff --git a/src/ObjectCalisthenics/Sniffs/CodeAnalysis/OneObjectOperatorPerLineSniff.php b/src/ObjectCalisthenics/Sniffs/CodeAnalysis/OneObjectOperatorPerLineSniff.php
index adc8cce..1162ede 100644
--- a/src/ObjectCalisthenics/Sniffs/CodeAnalysis/OneObjectOperatorPerLineSniff.php
+++ b/src/ObjectCalisthenics/Sniffs/CodeAnalysis/OneObjectOperatorPerLineSniff.php
@@ -24,14 +24,14 @@ final class OneObjectOperatorPerLineSniff implements Sniff
      * @var string[]
      */
     public $methodsStartingAFluentInterface = [
-        'createQueryBuilder'
+        'createQueryBuilder',
     ];
 
     /**
      * @var string[]
      */
     public $methodsEndingAFluentInterface = [
-        'execute', 'getQuery'
+        'execute', 'getQuery',
     ];
 
     /**
@@ -45,14 +45,14 @@ final class OneObjectOperatorPerLineSniff implements Sniff
     private $position;
 
     /**
-     * @var array
+     * @var mixed[]
      */
-    private $callerTokens;
+    private $callerTokens = [];
 
     /**
      * @var mixed[]
      */
-    private $tokens;
+    private $tokens = [];
 
     /**
      * @var string
@@ -106,6 +106,9 @@ private function handleTwoObjectOperators(bool $isOwnCall): void
         }
     }
 
+    /**
+     * @param mixed[] $tmpToken
+     */
     private function handleExcludedFluentInterfaces(array $tmpToken, string $tmpTokenType, bool $isOwnCall): void
     {
         if ((count($this->callerTokens) - (int) $isOwnCall) === 0) {
@@ -119,7 +122,7 @@ private function handleExcludedFluentInterfaces(array $tmpToken, string $tmpToke
         if (($memberTokenType === 'property' && $tmpTokenType === 'property')
             || ($memberTokenType === 'method' && $tmpTokenType === 'property')
             || ($memberTokenType === 'method' && $tmpTokenType === 'method'
-            && $memberTokenCount > 1 && $memberToken['token']['content'] !== $tmpToken['content']
+            && $memberTokenCount > 1 && $tmpToken['content'] !== $memberToken['token']['content']
             && ! $this->isInFluentInterfaceMode())
         ) {
             $this->file->addError(self::ERROR_MESSAGE, $this->position, self::class);
@@ -140,7 +143,7 @@ private function isInFluentInterfaceMode(): bool
     }
 
     /**
-     * @param mixed[] $methods
+     * @param string[] $methods
      *
      * @return int The last position of the method calls within the callerTokens
      *             or -2 if none of the methods has been called
@@ -177,6 +180,9 @@ private function handleObjectOperators(int $pointer, bool $isOwnCall): void
         }
     }
 
+    /**
+     * @param mixed[] $token
+     */
     private function getTokenType(array $token): string
     {
         if ($token['code'] === T_OPEN_PARENTHESIS) {
diff --git a/src/ObjectCalisthenics/Sniffs/Metrics/MaxNestingLevelSniff.php b/src/ObjectCalisthenics/Sniffs/Metrics/MaxNestingLevelSniff.php
index 6ecc8ed..fec0509 100644
--- a/src/ObjectCalisthenics/Sniffs/Metrics/MaxNestingLevelSniff.php
+++ b/src/ObjectCalisthenics/Sniffs/Metrics/MaxNestingLevelSniff.php
@@ -33,7 +33,7 @@ final class MaxNestingLevelSniff implements Sniff
     private $nestingLevel;
 
     /**
-     * @var array
+     * @var mixed[]
      */
     private $ignoredScopeStack = [];
 
@@ -91,6 +91,9 @@ private function handleNestingLevel(int $nestingLevel): void
         }
     }
 
+    /**
+     * @param mixed[] $tokens
+     */
     private function iterateTokens(int $start, int $end, array $tokens): void
     {
         $this->currentPtr = $start + 1;
@@ -103,6 +106,9 @@ private function iterateTokens(int $start, int $end, array $tokens): void
         }
     }
 
+    /**
+     * @param mixed[] $nestedToken
+     */
     private function handleToken(array $nestedToken): void
     {
         $this->handleClosureToken($nestedToken);
@@ -118,11 +124,17 @@ private function handleToken(array $nestedToken): void
         }
     }
 
+    /**
+     * @param mixed[] $token
+     */
     private function subtractFunctionNestingLevel(array $token): int
     {
         return $this->nestingLevel - $token['level'] - 1;
     }
 
+    /**
+     * @param mixed[] $nestedToken
+     */
     private function handleClosureToken(array $nestedToken): void
     {
         if ($nestedToken['code'] === T_CLOSURE) {
@@ -134,6 +146,9 @@ private function handleClosureToken(array $nestedToken): void
         }
     }
 
+    /**
+     * @param mixed[] $nestedToken
+     */
     private function handleCaseToken(array $nestedToken): void
     {
         if (in_array($nestedToken['code'], [T_CASE, T_DEFAULT])) {
@@ -152,6 +167,9 @@ private function adjustNestingLevelToIgnoredScope(): void
         }
     }
 
+    /**
+     * @param mixed[] $ignoredScope
+     */
     private function unsetScopeIfNotCurrent(int $key, array $ignoredScope): void
     {
         if ($ignoredScope['scope_closer'] !== $this->currentPtr) {
diff --git a/src/ObjectCalisthenics/Sniffs/NamingConventions/NoSetterSniff.php b/src/ObjectCalisthenics/Sniffs/NamingConventions/NoSetterSniff.php
index 05cc164..8566408 100644
--- a/src/ObjectCalisthenics/Sniffs/NamingConventions/NoSetterSniff.php
+++ b/src/ObjectCalisthenics/Sniffs/NamingConventions/NoSetterSniff.php
@@ -18,6 +18,9 @@ final class NoSetterSniff implements Sniff
      */
     private const SETTER_REGEX = '/^set[A-Z0-9]/';
 
+    /**
+     * @return int[]
+     */
     public function register(): array
     {
         return [T_FUNCTION];
diff --git a/tests/Sniffs/AbstractSniffTestCase.php b/tests/Sniffs/AbstractSniffTestCase.php
index cf3e70e..12e2d30 100644
--- a/tests/Sniffs/AbstractSniffTestCase.php
+++ b/tests/Sniffs/AbstractSniffTestCase.php
@@ -30,7 +30,7 @@ abstract class AbstractSniffTestCase extends TestCase
 
     protected function runSniffTestForDirectory(string $sniffClass, string $directory): void
     {
-        $container = (new ContainerFactory)->createWithoutConfig();
+        $container = (new ContainerFactory)->create();
         $this->sniffFileProcessor = $container->get(SniffFileProcessor::class);
         $this->errorCollector = $container->get(ErrorCollector::class);
         $this->fixer = $container->get(Fixer::class);