diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index f8864a2..f359ab3 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -29,7 +29,7 @@ jobs:
           coverage: xdebug
 
       - name: Install dependencies
-        run: composer install
+        run: composer update
 
       - name: Execute tests
         run: vendor/bin/phpunit --verbose
diff --git a/.scrutinizer.yml b/.scrutinizer.yml
index 74ce2ea..6ead1df 100644
--- a/.scrutinizer.yml
+++ b/.scrutinizer.yml
@@ -14,7 +14,7 @@ tools:
 
 build:
     environment:
-       php: 7.1
+       php: 8.0
     tests:
             override:
                 -
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 89c464a..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,13 +0,0 @@
-language: php
-php:
-- 7.1
-- 7.2
-- 7.3
-
-before_script:
-- composer install
-
-script:
-- ./vendor/bin/phpstan analyse --level 7 src
-- ./vendor/bin/phpunit
-- ./vendor/bin/infection --min-msi=75 --min-covered-msi=75
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7066af0..4e035d6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,15 +6,19 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/) 
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
-## [v2.0.1](https://github.com/linna/typed-array/compare/v2.0.0...v2.0.1) - 2019-03-XX
+## [v2.0.1](https://github.com/linna/typed-array/compare/v2.0.0...v2.0.1) - 2020-03-23
 
 ### Added
 - php 7.3 support
+- php 7.4 support
 
 ### Changed
 - `.scrutinizer.yml` updated for use phpunit from `vendor` directory
 - Merge pull request #14 from peter279k/enhance_stuffs with code enhancements
 
+### Removed
+- Travis CI usage for test build.
+
 ## [v2.0.0](https://github.com/linna/typed-array/compare/v1.0.5...v2.0.0) - 2018-08-13
 
 ### Changed
diff --git a/README.md b/README.md
index 75c36a1..6681b3d 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@
 
 <div align="center">
 
-[![Build Status](https://travis-ci.org/linna/typed-array.svg?branch=master)](https://travis-ci.org/linna/typed-array)
+[![Tests](https://github.com/linna/typed-array/actions/workflows/tests.yml/badge.svg)](https://github.com/linna/typed-array/actions/workflows/tests.yml)
 [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/linna/typed-array/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/linna/typed-array/?branch=master)
 [![Code Coverage](https://scrutinizer-ci.com/g/linna/typed-array/badges/coverage.png?b=master)](https://scrutinizer-ci.com/g/linna/typed-array/?branch=master)
 [![StyleCI](https://styleci.io/repos/93407083/shield?branch=master&style=flat)](https://styleci.io/repos/93407083)
diff --git a/src/Linna/TypedArrayObject/ClassArrayObject.php b/src/Linna/TypedArrayObject/ClassArrayObject.php
index 133a1b8..47a5768 100644
--- a/src/Linna/TypedArrayObject/ClassArrayObject.php
+++ b/src/Linna/TypedArrayObject/ClassArrayObject.php
@@ -37,7 +37,7 @@ class ClassArrayObject extends ArrayObject
     public function __construct(string $class, array $input = [], int $flags = 0, string $iterator_class = "ArrayIterator")
     {
         $this->type = $class;
-        
+
         if (!\class_exists($class)) {
             throw new InvalidArgumentException("Type <{$this->type}> provided isn't a class.");
         }
diff --git a/tests/ArrayArrayObjectTest.php b/tests/ArrayArrayObjectTest.php
index b3e0a93..5bddd4e 100644
--- a/tests/ArrayArrayObjectTest.php
+++ b/tests/ArrayArrayObjectTest.php
@@ -43,11 +43,11 @@ public function testSetValueWithValidArgument(): void
     {
         $arrayArray = new ArrayArrayObject();
         $arrayArray[] = [1,2,3];
-        
+
         $this->assertSame(1, $this->count($arrayArray));
         $this->assertSame([1,2,3], $arrayArray[0]);
     }
-    
+
     /**
      * Test append value with valid argument.
      */
@@ -55,11 +55,11 @@ public function testAppendValueWithValidArgument(): void
     {
         $arrayArray = new ArrayArrayObject();
         $arrayArray->append([1,2,3]);
-        
+
         $this->assertSame(1, $this->count($arrayArray));
         $this->assertSame([1,2,3], $arrayArray[0]);
     }
-    
+
     /**
      * Provide invalid typed arrays.
      *
@@ -70,7 +70,9 @@ public function invalidArrayProvider(): array
         return [
             //[[[1], [2]]], //array
             [[true, false]], //bool
-            [[function () {}, function () {}]], //callable
+            [[function () {
+            }, function () {
+            }]], //callable
             [[1.1, 2.2]], //float
             [[1, 2]], //int
             [[(object) ['name' => 'foo'], (object) ['name' => 'bar']]], //object
@@ -80,13 +82,13 @@ public function invalidArrayProvider(): array
 
     /**
      * Test new instance with invalid argument.
-     * 
+     *
      * @dataProvider invalidArrayProvider
      */
     public function testNewInstanceWithInvalidArgument(array $array): void
     {
         $this->expectException(InvalidArgumentException::class);
-        
+
         $arrayArray = new ArrayArrayObject($array);
     }
 
@@ -100,7 +102,8 @@ public function invalidValueProvider(): array
         return [
             //[[1]], //array
             [true], //bool
-            [function () {}], //callable
+            [function () {
+            }], //callable
             [1.1], //float
             [1], //int
             [(object) ['name' => 'foo']], //object
@@ -110,26 +113,26 @@ public function invalidValueProvider(): array
 
     /**
      * Test set value with invalid argument.
-     * 
+     *
      * @dataProvider invalidValueProvider
      */
     public function testSetValueWithInvalidArgument($value): void
     {
         $this->expectException(InvalidArgumentException::class);
-     
+
         $arrayArray = new ArrayArrayObject();
         $arrayArray[] = $value;
     }
 
     /**
      * Test append value with invalid argument.
-     * 
+     *
      * @dataProvider invalidValueProvider
      */
     public function testAppendValueWithInvalidArgument($value): void
     {
         $this->expectException(InvalidArgumentException::class);
-        
+
         $arrayArray = new ArrayArrayObject();
         $arrayArray->append($value);
     }
diff --git a/tests/BoolArrayObjectTest.php b/tests/BoolArrayObjectTest.php
index ee8c48c..040131e 100644
--- a/tests/BoolArrayObjectTest.php
+++ b/tests/BoolArrayObjectTest.php
@@ -43,11 +43,11 @@ public function testSetValueWithValidArgument(): void
     {
         $boolArray = new BoolArrayObject();
         $boolArray[] = false;
-        
+
         $this->assertSame(1, $this->count($boolArray));
         $this->assertSame(false, $boolArray[0]);
     }
-    
+
     /**
      * Test append value with valid argument.
      */
@@ -55,11 +55,11 @@ public function testAppendValueWithValidArgument(): void
     {
         $boolArray = new BoolArrayObject();
         $boolArray->append(false);
-        
+
         $this->assertSame(1, $this->count($boolArray));
         $this->assertSame(false, $boolArray[0]);
     }
-    
+
     /**
      * Provide invalid typed arrays.
      *
@@ -70,7 +70,9 @@ public function invalidArrayProvider(): array
         return [
             [[[1], [2]]], //array
             //[[true, false]], //bool
-            [[function () {}, function () {}]], //callable
+            [[function () {
+            }, function () {
+            }]], //callable
             [[1.1, 2.2]], //float
             [[1, 2]], //int
             [[(object) ['name' => 'foo'], (object) ['name' => 'bar']]], //object
@@ -80,13 +82,13 @@ public function invalidArrayProvider(): array
 
     /**
      * Test new instance with invalid argument.
-     * 
+     *
      * @dataProvider invalidArrayProvider
      */
     public function testNewInstanceWithInvalidArgument(array $array): void
     {
         $this->expectException(InvalidArgumentException::class);
-        
+
         $boolArray = new BoolArrayObject($array);
     }
 
@@ -100,7 +102,8 @@ public function invalidValueProvider(): array
         return [
             [[1]], //array
             //[true], //bool
-            [function () {}], //callable
+            [function () {
+            }], //callable
             [1.1], //float
             [1], //int
             [(object) ['name' => 'foo']], //object
@@ -110,26 +113,26 @@ public function invalidValueProvider(): array
 
     /**
      * Test set value with invalid argument.
-     * 
+     *
      * @dataProvider invalidValueProvider
      */
     public function testSetValueWithInvalidArgument($value): void
     {
         $this->expectException(InvalidArgumentException::class);
-     
+
         $boolArray = new BoolArrayObject();
         $boolArray[] = $value;
     }
 
     /**
      * Test append value with invalid argument.
-     * 
+     *
      * @dataProvider invalidValueProvider
      */
     public function testAppendValueWithInvalidArgument($value): void
     {
         $this->expectException(InvalidArgumentException::class);
-        
+
         $boolArray = new BoolArrayObject();
         $boolArray->append($value);
     }
diff --git a/tests/CallableArrayObjectTest.php b/tests/CallableArrayObjectTest.php
index 455de31..253dbc3 100644
--- a/tests/CallableArrayObjectTest.php
+++ b/tests/CallableArrayObjectTest.php
@@ -33,7 +33,9 @@ public function testNewInstance(): void
      */
     public function testNewInstanceWithValidArgument(): void
     {
-        $this->assertInstanceOf(CallableArrayObject::class, (new CallableArrayObject([function($e){return $e+1;}])));
+        $this->assertInstanceOf(CallableArrayObject::class, (new CallableArrayObject([function ($e) {
+            return $e+1;
+        }])));
     }
 
     /**
@@ -42,24 +44,28 @@ public function testNewInstanceWithValidArgument(): void
     public function testSetValueWithValidArgument(): void
     {
         $callableArray = new CallableArrayObject();
-        $callableArray[] = function($e){return $e+1;};
-        
+        $callableArray[] = function ($e) {
+            return $e+1;
+        };
+
         $this->assertSame(1, $this->count($callableArray));
-        $this->assertSame(true, is_callable($callableArray[0]));
+        $this->assertIsCallable($callableArray[0]);
     }
-    
+
     /**
      * Test append value with valid argument.
      */
     public function testAppendValueWithValidArgument(): void
     {
         $callableArray = new CallableArrayObject();
-        $callableArray->append(function($e){return $e+1;});
-        
+        $callableArray->append(function ($e) {
+            return $e+1;
+        });
+
         $this->assertSame(1, $this->count($callableArray));
-        $this->assertSame(true, is_callable($callableArray[0]));
+        $this->assertIsCallable($callableArray[0]);
     }
-    
+
     /**
      * Provide invalid typed arrays.
      *
@@ -80,13 +86,13 @@ public function invalidArrayProvider(): array
 
     /**
      * Test new instance with invalid argument.
-     * 
+     *
      * @dataProvider invalidArrayProvider
      */
     public function testNewInstanceWithInvalidArgument(array $array): void
     {
         $this->expectException(InvalidArgumentException::class);
-        
+
         $callableArray = new CallableArrayObject($array);
     }
 
@@ -110,26 +116,26 @@ public function invalidValueProvider(): array
 
     /**
      * Test set value with invalid argument.
-     * 
+     *
      * @dataProvider invalidValueProvider
      */
     public function testSetValueWithInvalidArgument($value): void
     {
         $this->expectException(InvalidArgumentException::class);
-     
+
         $callableArray = new CallableArrayObject();
         $callableArray[] = $value;
     }
 
     /**
      * Test append value with invalid argument.
-     * 
+     *
      * @dataProvider invalidValueProvider
      */
     public function testAppendValueWithInvalidArgument($value): void
     {
         $this->expectException(InvalidArgumentException::class);
-        
+
         $callableArray = new CallableArrayObject();
         $callableArray->append($value);
     }
diff --git a/tests/ClassArrayObjectTest.php b/tests/ClassArrayObjectTest.php
index 3b20a4f..650d110 100644
--- a/tests/ClassArrayObjectTest.php
+++ b/tests/ClassArrayObjectTest.php
@@ -39,7 +39,7 @@ public function testNewInstanceWithValidArgument(): void
             (new ArrayObject),
             (new ArrayObject)
         ];
-        
+
         $this->assertInstanceOf(ClassArrayObject::class, (new ClassArrayObject(ArrayObject::class, $array)));
     }
 
@@ -49,28 +49,28 @@ public function testNewInstanceWithValidArgument(): void
     public function testSetValueWithValidArgument(): void
     {
         $object = new ArrayObject();
-        
+
         $classArray = new ClassArrayObject(ArrayObject::class);
         $classArray[] = $object;
-        
+
         $this->assertSame(1, $this->count($classArray));
         $this->assertSame($object, $classArray[0]);
     }
-    
+
     /**
      * Test append value with valid argument.
      */
     public function testAppendValueWithValidArgument(): void
     {
         $object = new ArrayObject();
-        
+
         $classArray = new ClassArrayObject(ArrayObject::class);
         $classArray->append($object);
-        
+
         $this->assertSame(1, $this->count($classArray));
         $this->assertSame($object, $classArray[0]);
     }
-    
+
     /**
      * Provide invalid typed arrays.
      *
@@ -81,7 +81,9 @@ public function invalidArrayProvider(): array
         return [
             [[[1], [2]]], //array
             [[true, false]], //bool
-            [[function () {}, function () {}]], //callable
+            [[function () {
+            }, function () {
+            }]], //callable
             [[1.1, 2.2]], //float
             [[1, 2]], //int
             [[(object) ['name' => 'foo'], (object) ['name' => 'bar']]], //object
@@ -91,13 +93,13 @@ public function invalidArrayProvider(): array
 
     /**
      * Test new instance with invalid argument.
-     * 
+     *
      * @dataProvider invalidArrayProvider
      */
     public function testNewInstanceWithInvalidArgument(array $array): void
     {
         $this->expectException(InvalidArgumentException::class);
-        
+
         $classArray = new ClassArrayObject(ArrayObject::class, $array);
     }
 
@@ -111,7 +113,8 @@ public function invalidValueProvider(): array
         return [
             [[1]], //array
             [true], //bool
-            [function () {}], //callable
+            [function () {
+            }], //callable
             [1.1], //float
             [1], //int
             [(object) ['name' => 'foo']], //object
@@ -121,26 +124,26 @@ public function invalidValueProvider(): array
 
     /**
      * Test set value with invalid argument.
-     * 
+     *
      * @dataProvider invalidValueProvider
      */
     public function testSetValueWithInvalidArgument($value): void
     {
         $this->expectException(InvalidArgumentException::class);
-     
+
         $classArray = new ClassArrayObject(ArrayObject::class);
         $classArray[] = $value;
     }
 
     /**
      * Test append value with invalid argument.
-     * 
+     *
      * @dataProvider invalidValueProvider
      */
     public function testAppendValueWithInvalidArgument($value): void
     {
         $this->expectException(InvalidArgumentException::class);
-        
+
         $classArray = new ClassArrayObject(ArrayObject::class);
         $classArray->append($value);
     }
diff --git a/tests/FloatArrayObjectTest.php b/tests/FloatArrayObjectTest.php
index af2d4cb..5485250 100644
--- a/tests/FloatArrayObjectTest.php
+++ b/tests/FloatArrayObjectTest.php
@@ -43,11 +43,11 @@ public function testSetValueWithValidArgument(): void
     {
         $floatArray = new FloatArrayObject();
         $floatArray[] = 1.1;
-        
+
         $this->assertSame(1, $this->count($floatArray));
         $this->assertSame(1.1, $floatArray[0]);
     }
-    
+
     /**
      * Test append value with valid argument.
      */
@@ -55,11 +55,11 @@ public function testAppendValueWithValidArgument(): void
     {
         $floatArray = new FloatArrayObject();
         $floatArray->append(1.1);
-        
+
         $this->assertSame(1, $this->count($floatArray));
         $this->assertSame(1.1, $floatArray[0]);
     }
-    
+
     /**
      * Provide invalid typed arrays.
      *
@@ -70,7 +70,9 @@ public function invalidArrayProvider(): array
         return [
             [[[1], [2]]], //array
             [[true, false]], //bool
-            [[function () {}, function () {}]], //callable
+            [[function () {
+            }, function () {
+            }]], //callable
             //[[1.1, 2.2]], //float
             [[1, 2]], //int
             [[(object) ['name' => 'foo'], (object) ['name' => 'bar']]], //object
@@ -80,13 +82,13 @@ public function invalidArrayProvider(): array
 
     /**
      * Test new instance with invalid argument.
-     * 
+     *
      * @dataProvider invalidArrayProvider
      */
     public function testNewInstanceWithInvalidArgument(array $array): void
     {
         $this->expectException(InvalidArgumentException::class);
-        
+
         $floatArray = new FloatArrayObject($array);
     }
 
@@ -100,7 +102,8 @@ public function invalidValueProvider(): array
         return [
             [[1]], //array
             [true], //bool
-            [function () {}], //callable
+            [function () {
+            }], //callable
             //[1.1], //float
             [1], //int
             [(object) ['name' => 'foo']], //object
@@ -110,26 +113,26 @@ public function invalidValueProvider(): array
 
     /**
      * Test set value with invalid argument.
-     * 
+     *
      * @dataProvider invalidValueProvider
      */
     public function testSetValueWithInvalidArgument($value): void
     {
         $this->expectException(InvalidArgumentException::class);
-     
+
         $floatArray = new FloatArrayObject();
         $floatArray[] = $value;
     }
 
     /**
      * Test append value with invalid argument.
-     * 
+     *
      * @dataProvider invalidValueProvider
      */
     public function testAppendValueWithInvalidArgument($value): void
     {
         $this->expectException(InvalidArgumentException::class);
-        
+
         $floatArray = new FloatArrayObject();
         $floatArray->append($value);
     }
diff --git a/tests/IntArrayObjectTest.php b/tests/IntArrayObjectTest.php
index 6eda2af..9a70881 100644
--- a/tests/IntArrayObjectTest.php
+++ b/tests/IntArrayObjectTest.php
@@ -43,11 +43,11 @@ public function testSetValueWithValidArgument(): void
     {
         $intArray = new IntArrayObject();
         $intArray[] = 1;
-        
+
         $this->assertSame(1, $this->count($intArray));
         $this->assertSame(1, $intArray[0]);
     }
-    
+
     /**
      * Test append value with valid argument.
      */
@@ -55,11 +55,11 @@ public function testAppendValueWithValidArgument(): void
     {
         $intArray = new IntArrayObject();
         $intArray->append(1);
-        
+
         $this->assertSame(1, $this->count($intArray));
         $this->assertSame(1, $intArray[0]);
     }
-    
+
     /**
      * Provide invalid typed arrays.
      *
@@ -70,7 +70,9 @@ public function invalidArrayProvider(): array
         return [
             [[[1], [2]]], //array
             [[true, false]], //bool
-            [[function () {}, function () {}]], //callable
+            [[function () {
+            }, function () {
+            }]], //callable
             [[1.1, 2.2]], //float
             //[[1, 2]], //int
             [[(object) ['name' => 'foo'], (object) ['name' => 'bar']]], //object
@@ -80,13 +82,13 @@ public function invalidArrayProvider(): array
 
     /**
      * Test new instance with invalid argument.
-     * 
+     *
      * @dataProvider invalidArrayProvider
      */
     public function testNewInstanceWithInvalidArgument(array $array): void
     {
         $this->expectException(InvalidArgumentException::class);
-        
+
         $intArray = new IntArrayObject($array);
     }
 
@@ -100,7 +102,8 @@ public function invalidValueProvider(): array
         return [
             [[1]], //array
             [true], //bool
-            [function () {}], //callable
+            [function () {
+            }], //callable
             [1.1], //float
             //[1], //int
             [(object) ['name' => 'foo']], //object
@@ -110,26 +113,26 @@ public function invalidValueProvider(): array
 
     /**
      * Test set value with invalid argument.
-     * 
+     *
      * @dataProvider invalidValueProvider
      */
     public function testSetValueWithInvalidArgument($value): void
     {
         $this->expectException(InvalidArgumentException::class);
-     
+
         $intArray = new IntArrayObject();
         $intArray[] = $value;
     }
 
     /**
      * Test append value with invalid argument.
-     * 
+     *
      * @dataProvider invalidValueProvider
      */
     public function testAppendValueWithInvalidArgument($value): void
     {
         $this->expectException(InvalidArgumentException::class);
-        
+
         $intArray = new IntArrayObject();
         $intArray->append($value);
     }
diff --git a/tests/ObjectArrayObject.php b/tests/ObjectArrayObject.php
index 44271de..3e56607 100644
--- a/tests/ObjectArrayObject.php
+++ b/tests/ObjectArrayObject.php
@@ -42,14 +42,14 @@ public function testNewInstanceWithValidArgument(): void
     public function testSetValueWithValidArgument(): void
     {
         $object = (object)["name" => "test"];
-        
+
         $objectArray = new ObjectArrayObject();
         $objectArray[] = $object;
-        
+
         $this->assertSame(1, $this->count($objectArray));
         $this->assertSame($object, $objectArray[0]);
     }
-    
+
     /**
      * Test append value with valid argument.
      */
@@ -57,11 +57,11 @@ public function testAppendValueWithValidArgument(): void
     {
         $objectArray = new ObjectArrayObject();
         $objectArray->append($object);
-        
+
         $this->assertSame(1, $this->count($objectArray));
         $this->assertSame($object, $objectArray[0]);
     }
-    
+
     /**
      * Provide invalid typed arrays.
      *
@@ -72,7 +72,9 @@ public function invalidArrayProvider(): array
         return [
             [[[1], [2]]], //array
             [[true, false]], //bool
-            [[function () {}, function () {}]], //callable
+            [[function () {
+            }, function () {
+            }]], //callable
             [[1.1, 2.2]], //float
             [[1, 2]], //int
             //[[(object) ['name' => 'foo'], (object) ['name' => 'bar']]], //object
@@ -82,13 +84,13 @@ public function invalidArrayProvider(): array
 
     /**
      * Test new instance with invalid argument.
-     * 
+     *
      * @dataProvider invalidArrayProvider
      */
     public function testNewInstanceWithInvalidArgument(array $array): void
     {
         $this->expectException(InvalidArgumentException::class);
-        
+
         $objectArray = new ObjectArrayObject($array);
     }
 
@@ -102,7 +104,8 @@ public function invalidValueProvider(): array
         return [
             [[1]], //array
             [true], //bool
-            [function () {}], //callable
+            [function () {
+            }], //callable
             [1.1], //float
             [1], //int
             //[(object) ['name' => 'foo']], //object
@@ -112,26 +115,26 @@ public function invalidValueProvider(): array
 
     /**
      * Test set value with invalid argument.
-     * 
+     *
      * @dataProvider invalidValueProvider
      */
     public function testSetValueWithInvalidArgument($value): void
     {
         $this->expectException(InvalidArgumentException::class);
-     
+
         $objectArray = new ObjectArrayObject();
         $objectArray[] = $value;
     }
 
     /**
      * Test append value with invalid argument.
-     * 
+     *
      * @dataProvider invalidValueProvider
      */
     public function testAppendValueWithInvalidArgument($value): void
     {
         $this->expectException(InvalidArgumentException::class);
-        
+
         $objectArray = new ObjectArrayObject();
         $objectArray->append($value);
     }
diff --git a/tests/StringArrayObjectTest.php b/tests/StringArrayObjectTest.php
index 33f5c0d..0a78372 100644
--- a/tests/StringArrayObjectTest.php
+++ b/tests/StringArrayObjectTest.php
@@ -43,11 +43,11 @@ public function testSetValueWithValidArgument(): void
     {
         $stringArray = new StringArrayObject();
         $stringArray[] = 'a';
-        
+
         $this->assertSame(1, $this->count($stringArray));
         $this->assertSame('a', $stringArray[0]);
     }
-    
+
     /**
      * Test append value with valid argument.
      */
@@ -55,11 +55,11 @@ public function testAppendValueWithValidArgument(): void
     {
         $stringArray = new StringArrayObject();
         $stringArray->append('a');
-        
+
         $this->assertSame(1, $this->count($stringArray));
         $this->assertSame('a', $stringArray[0]);
     }
-    
+
     /**
      * Provide invalid typed arrays.
      *
@@ -70,7 +70,9 @@ public function invalidArrayProvider(): array
         return [
             [[[1], [2]]], //array
             [[true, false]], //bool
-            [[function () {}, function () {}]], //callable
+            [[function () {
+            }, function () {
+            }]], //callable
             [[1.1, 2.2]], //float
             [[1, 2]], //int
             [[(object) ['name' => 'foo'], (object) ['name' => 'bar']]], //object
@@ -80,13 +82,13 @@ public function invalidArrayProvider(): array
 
     /**
      * Test new instance with invalid argument.
-     * 
+     *
      * @dataProvider invalidArrayProvider
      */
     public function testNewInstanceWithInvalidArgument(array $array): void
     {
         $this->expectException(InvalidArgumentException::class);
-        
+
         $stringArray = new StringArrayObject($array);
     }
 
@@ -100,7 +102,8 @@ public function invalidValueProvider(): array
         return [
             [[1]], //array
             [true], //bool
-            [function () {}], //callable
+            [function () {
+            }], //callable
             [1.1], //float
             [1], //int
             [(object) ['name' => 'foo']], //object
@@ -110,26 +113,26 @@ public function invalidValueProvider(): array
 
     /**
      * Test set value with invalid argument.
-     * 
+     *
      * @dataProvider invalidValueProvider
      */
     public function testSetValueWithInvalidArgument($value): void
     {
         $this->expectException(InvalidArgumentException::class);
-     
+
         $stringArray = new StringArrayObject();
         $stringArray[] = $value;
     }
 
     /**
      * Test append value with invalid argument.
-     * 
+     *
      * @dataProvider invalidValueProvider
      */
     public function testAppendValueWithInvalidArgument($value): void
     {
         $this->expectException(InvalidArgumentException::class);
-        
+
         $stringArray = new StringArrayObject();
         $stringArray->append($value);
     }
diff --git a/tests/TypedArrayTest.php b/tests/TypedArrayTest.php
index eecf31c..020f0c5 100644
--- a/tests/TypedArrayTest.php
+++ b/tests/TypedArrayTest.php
@@ -199,7 +199,7 @@ public function testAssignrRightTypedValueToArray($type, $value)
         $array = new TypedArray($type);
         $array[] = $value;
 
-        $this->assertEquals(1, $array->count());
+        $this->assertSame(1, $array->count());
     }
 
     /**
@@ -349,7 +349,7 @@ public function testAssignrRightTypedObjectValueToArray()
         $array = new TypedArray(ArrayObject::class);
         $array[] = new ArrayObject([1, 2, 3]);
 
-        $this->assertEquals(1, $array->count());
+        $this->assertSame(1, $array->count());
     }
 
     /**