diff --git a/.php-cs-fixer.dist.php b/.php-cs-fixer.dist.php
index 02684c5..397cd8e 100644
--- a/.php-cs-fixer.dist.php
+++ b/.php-cs-fixer.dist.php
@@ -8,6 +8,7 @@
         'logical_operators' => true,
         'modernize_types_casting' => true,
         'nullable_type_declaration_for_default_null_value' => true,
+        'php_unit_test_case_static_method_calls' => true,
         'single_quote' => true,
         'trailing_comma_in_multiline' => ['after_heredoc' => true, 'elements' => ['arguments', 'array_destructuring', 'arrays']],
     ])
@@ -15,8 +16,9 @@
         PhpCsFixer\Finder::create()
             ->in([
                 __DIR__ . '/src',
+                __DIR__ . '/tests',
             ])
             ->name('*.php')
             ->ignoreDotFiles(true)
-            ->ignoreVCS(true)
-    );
\ No newline at end of file
+            ->ignoreVCS(true),
+    );
diff --git a/tests/unit/Copy/AbstractCopyPluginTest.php b/tests/unit/Copy/AbstractCopyPluginTest.php
index d817089..878b998 100644
--- a/tests/unit/Copy/AbstractCopyPluginTest.php
+++ b/tests/unit/Copy/AbstractCopyPluginTest.php
@@ -35,6 +35,6 @@ public function setUp(): void
      */
     public function testGetFileSystem(): void
     {
-        $this->assertInstanceOf(Filesystem::class, $this->subject->getFileSystem());
+        static::assertInstanceOf(Filesystem::class, $this->subject->getFileSystem());
     }
 }
diff --git a/tests/unit/Copy/Plugins/ChartJsTest.php b/tests/unit/Copy/Plugins/ChartJsTest.php
index a64e5cb..f37ad4d 100644
--- a/tests/unit/Copy/Plugins/ChartJsTest.php
+++ b/tests/unit/Copy/Plugins/ChartJsTest.php
@@ -35,7 +35,7 @@ public function setUp(): void
      */
     public function testGetUnpkgName(): void
     {
-        $this->assertSame('chart.js', $this->subject->getUnpkgName());
+        static::assertSame('chart.js', $this->subject->getUnpkgName());
     }
 
     /**
@@ -45,9 +45,9 @@ public function testGetUnpkgName(): void
     public function testGetUnpkgVersion(): void
     {
         try {
-            $this->assertIsString($this->subject->getUnpkgVersion());
+            static::assertIsString($this->subject->getUnpkgVersion());
         } catch (OutOfBoundsException $exception) {
-            $this->assertSame('Package "nnnick/chartjs" is not installed', $exception->getMessage());
+            static::assertSame('Package "nnnick/chartjs" is not installed', $exception->getMessage());
         }
     }
 
@@ -56,7 +56,7 @@ public function testGetUnpkgVersion(): void
      */
     public function testGetUnpkgSource(): void
     {
-        $this->assertSame('dist', $this->subject->getUnpkgSource());
+        static::assertSame('dist', $this->subject->getUnpkgSource());
     }
 
 
@@ -71,7 +71,7 @@ public function testGetUnpkgFiles(): void
             2 => 'helpers.js',
             3 => 'helpers.js.map',
         ];
-        $this->assertSame($result, $this->subject->getUnpkgFiles());
+        static::assertSame($result, $this->subject->getUnpkgFiles());
     }
 
     /**
@@ -79,7 +79,7 @@ public function testGetUnpkgFiles(): void
      */
     public function testGetComposerName(): void
     {
-        $this->assertSame('nnnick/chartjs', $this->subject->getComposerName());
+        static::assertSame('nnnick/chartjs', $this->subject->getComposerName());
     }
 
     /**
@@ -87,7 +87,7 @@ public function testGetComposerName(): void
      */
     public function testGetComposerSource(): void
     {
-        $this->assertSame('dist', $this->subject->getComposerSource());
+        static::assertSame('dist', $this->subject->getComposerSource());
     }
 
     /**
@@ -95,7 +95,7 @@ public function testGetComposerSource(): void
      */
     public function testGetComposerFiles(): void
     {
-        $this->assertSame(['*.js', '*.map'], $this->subject->getComposerFiles());
+        static::assertSame(['*.js', '*.map'], $this->subject->getComposerFiles());
     }
 
     /**
@@ -103,6 +103,6 @@ public function testGetComposerFiles(): void
      */
     public function testGetCopyTarget(): void
     {
-        $this->assertSame('js/lib/chartjs', $this->subject->getCopyTarget());
+        static::assertSame('js/lib/chartjs', $this->subject->getCopyTarget());
     }
 }
diff --git a/tests/unit/Copy/Plugins/FlatpickrTest.php b/tests/unit/Copy/Plugins/FlatpickrTest.php
index d34c5d8..a900916 100644
--- a/tests/unit/Copy/Plugins/FlatpickrTest.php
+++ b/tests/unit/Copy/Plugins/FlatpickrTest.php
@@ -35,7 +35,7 @@ public function setUp(): void
      */
     public function testGetUnpkgName(): void
     {
-        $this->assertSame('flatpickr', $this->subject->getUnpkgName());
+        static::assertSame('flatpickr', $this->subject->getUnpkgName());
     }
 
     /**
@@ -44,9 +44,9 @@ public function testGetUnpkgName(): void
     public function testGetUnpkgVersion(): void
     {
         try {
-            $this->assertIsString($this->subject->getUnpkgVersion());
+            static::assertIsString($this->subject->getUnpkgVersion());
         } catch (OutOfBoundsException $exception) {
-            $this->assertSame('Package "nnnick/chartjs" is not installed', $exception->getMessage());
+            static::assertSame('Package "nnnick/chartjs" is not installed', $exception->getMessage());
         }
     }
 
@@ -55,7 +55,7 @@ public function testGetUnpkgVersion(): void
      */
     public function testGetUnpkgSource(): void
     {
-        $this->assertSame('dist', $this->subject->getUnpkgSource());
+        static::assertSame('dist', $this->subject->getUnpkgSource());
     }
 
     /**
@@ -67,7 +67,7 @@ public function testGetUnpkgFiles(): void
             0 => 'flatpickr.min.css',
             1 => 'flatpickr.min.js',
         ];
-        $this->assertSame($result, $this->subject->getUnpkgFiles());
+        static::assertSame($result, $this->subject->getUnpkgFiles());
     }
 
     /**
@@ -75,6 +75,6 @@ public function testGetUnpkgFiles(): void
      */
     public function testGetCopyTarget(): void
     {
-        $this->assertSame('js/lib/flatpickr', $this->subject->getCopyTarget());
+        static::assertSame('js/lib/flatpickr', $this->subject->getCopyTarget());
     }
 }
diff --git a/tests/unit/Copy/Plugins/FlowJsTest.php b/tests/unit/Copy/Plugins/FlowJsTest.php
index 6dc1157..3b537c6 100644
--- a/tests/unit/Copy/Plugins/FlowJsTest.php
+++ b/tests/unit/Copy/Plugins/FlowJsTest.php
@@ -34,7 +34,7 @@ public function setUp(): void
      */
     public function testGetComposerName(): void
     {
-        $this->assertSame('flowjs/flowjs', $this->subject->getComposerName());
+        static::assertSame('flowjs/flowjs', $this->subject->getComposerName());
     }
 
     /**
@@ -42,7 +42,7 @@ public function testGetComposerName(): void
      */
     public function testGetComposerSource(): void
     {
-        $this->assertSame('dist', $this->subject->getComposerSource());
+        static::assertSame('dist', $this->subject->getComposerSource());
     }
 
     /**
@@ -50,7 +50,7 @@ public function testGetComposerSource(): void
      */
     public function testGetComposerFiles(): void
     {
-        $this->assertSame(['*.js'], $this->subject->getComposerFiles());
+        static::assertSame(['*.js'], $this->subject->getComposerFiles());
     }
 
     /**
@@ -58,6 +58,6 @@ public function testGetComposerFiles(): void
      */
     public function testGetCopyTarget(): void
     {
-        $this->assertSame('js/lib/uploader', $this->subject->getCopyTarget());
+        static::assertSame('js/lib/uploader', $this->subject->getCopyTarget());
     }
 }
diff --git a/tests/unit/Copy/Plugins/JQueryTest.php b/tests/unit/Copy/Plugins/JQueryTest.php
index cdc4921..4ea3dc1 100644
--- a/tests/unit/Copy/Plugins/JQueryTest.php
+++ b/tests/unit/Copy/Plugins/JQueryTest.php
@@ -34,7 +34,7 @@ public function setUp(): void
      */
     public function testGetComposerName(): void
     {
-        $this->assertSame('components/jquery', $this->subject->getComposerName());
+        static::assertSame('components/jquery', $this->subject->getComposerName());
     }
 
     /**
@@ -42,7 +42,7 @@ public function testGetComposerName(): void
      */
     public function testGetComposerSource(): void
     {
-        $this->assertSame('', $this->subject->getComposerSource());
+        static::assertSame('', $this->subject->getComposerSource());
     }
 
     /**
@@ -50,7 +50,7 @@ public function testGetComposerSource(): void
      */
     public function testGetComposerFiles(): void
     {
-        $this->assertSame(['*.js', '*.map'], $this->subject->getComposerFiles());
+        static::assertSame(['*.js', '*.map'], $this->subject->getComposerFiles());
     }
 
     /**
@@ -58,6 +58,6 @@ public function testGetComposerFiles(): void
      */
     public function testGetCopyTarget(): void
     {
-        $this->assertSame('js/lib/jquery', $this->subject->getCopyTarget());
+        static::assertSame('js/lib/jquery', $this->subject->getCopyTarget());
     }
 }
diff --git a/tests/unit/Copy/Plugins/TinyMceLanguagesTest.php b/tests/unit/Copy/Plugins/TinyMceLanguagesTest.php
index bc8207f..7454238 100644
--- a/tests/unit/Copy/Plugins/TinyMceLanguagesTest.php
+++ b/tests/unit/Copy/Plugins/TinyMceLanguagesTest.php
@@ -35,7 +35,7 @@ public function setUp(): void
      */
     public function testGetComposerName(): void
     {
-        $this->assertSame('mklkj/tinymce-i18n', $this->subject->getComposerName());
+        static::assertSame('mklkj/tinymce-i18n', $this->subject->getComposerName());
     }
 
     /**
@@ -44,9 +44,9 @@ public function testGetComposerName(): void
     public function testGetComposerSource(): void
     {
         try {
-            $this->assertSame('langs7', $this->subject->getComposerSource());
+            static::assertSame('langs7', $this->subject->getComposerSource());
         } catch (OutOfBoundsException $exception) {
-            $this->assertSame('Package "tinymce/tinymce" is not installed', $exception->getMessage());
+            static::assertSame('Package "tinymce/tinymce" is not installed', $exception->getMessage());
         }
     }
 
@@ -55,7 +55,7 @@ public function testGetComposerSource(): void
      */
     public function testGetComposerFiles(): void
     {
-        $this->assertSame(['*.css', '*.js'], $this->subject->getComposerFiles());
+        static::assertSame(['*.css', '*.js'], $this->subject->getComposerFiles());
     }
 
     /**
@@ -63,6 +63,6 @@ public function testGetComposerFiles(): void
      */
     public function testGetCopyTarget(): void
     {
-        $this->assertSame('js/lib/tinymce/langs', $this->subject->getCopyTarget());
+        static::assertSame('js/lib/tinymce/langs', $this->subject->getCopyTarget());
     }
 }
diff --git a/tests/unit/Copy/Plugins/TinyMceTest.php b/tests/unit/Copy/Plugins/TinyMceTest.php
index f954341..0e7f306 100644
--- a/tests/unit/Copy/Plugins/TinyMceTest.php
+++ b/tests/unit/Copy/Plugins/TinyMceTest.php
@@ -34,7 +34,7 @@ public function setUp(): void
      */
     public function testGetComposerName(): void
     {
-        $this->assertSame('tinymce/tinymce', $this->subject->getComposerName());
+        static::assertSame('tinymce/tinymce', $this->subject->getComposerName());
     }
 
     /**
@@ -42,7 +42,7 @@ public function testGetComposerName(): void
      */
     public function testGetComposerSource(): void
     {
-        $this->assertSame('', $this->subject->getComposerSource());
+        static::assertSame('', $this->subject->getComposerSource());
     }
 
     /**
@@ -50,7 +50,7 @@ public function testGetComposerSource(): void
      */
     public function testGetComposerFiles(): void
     {
-        $this->assertSame(['*.css', '*.js'], $this->subject->getComposerFiles());
+        static::assertSame(['*.css', '*.js'], $this->subject->getComposerFiles());
     }
 
     /**
@@ -58,6 +58,6 @@ public function testGetComposerFiles(): void
      */
     public function testGetCopyTarget(): void
     {
-        $this->assertSame('js/lib/tinymce', $this->subject->getCopyTarget());
+        static::assertSame('js/lib/tinymce', $this->subject->getCopyTarget());
     }
 }
diff --git a/tests/unit/Copy/Unpkg/ConfigTest.php b/tests/unit/Copy/Unpkg/ConfigTest.php
index 97c1c3f..c597708 100644
--- a/tests/unit/Copy/Unpkg/ConfigTest.php
+++ b/tests/unit/Copy/Unpkg/ConfigTest.php
@@ -36,7 +36,7 @@ public function setUp(): void
      */
     public function testGetValidatedConfig(?array $expectedResult, $packageConfig): void
     {
-        $this->assertSame($expectedResult, $this->subject->getValidatedConfig($packageConfig));
+        static::assertSame($expectedResult, $this->subject->getValidatedConfig($packageConfig));
     }
 
     public function provideGetValidatedConfig(): Generator
@@ -152,7 +152,7 @@ public function testUnpkgName(): void
     {
         $source = '';
         $this->subject->setUnpkgName($source);
-        $this->assertSame($source, $this->subject->getUnpkgName());
+        static::assertSame($source, $this->subject->getUnpkgName());
     }
 
     /**
@@ -163,7 +163,7 @@ public function testUnpkgVersion(): void
     {
         $source = '';
         $this->subject->setUnpkgVersion($source);
-        $this->assertSame($source, $this->subject->getUnpkgVersion());
+        static::assertSame($source, $this->subject->getUnpkgVersion());
     }
 
     /**
@@ -174,7 +174,7 @@ public function testUnpkgSource(): void
     {
         $source = '';
         $this->subject->setUnpkgSource($source);
-        $this->assertSame($source, $this->subject->getUnpkgSource());
+        static::assertSame($source, $this->subject->getUnpkgSource());
     }
 
     /**
@@ -185,7 +185,7 @@ public function testCopyTarget(): void
     {
         $target = '';
         $this->subject->setCopyTarget($target);
-        $this->assertSame($target, $this->subject->getCopyTarget());
+        static::assertSame($target, $this->subject->getCopyTarget());
     }
 
     /**
@@ -196,6 +196,6 @@ public function testUnpkgFiles(): void
     {
         $files = [];
         $this->subject->setUnpkgFiles($files);
-        $this->assertSame($files, $this->subject->getUnpkgFiles());
+        static::assertSame($files, $this->subject->getUnpkgFiles());
     }
 }
diff --git a/tests/unit/Copy/Unpkg/GenericTest.php b/tests/unit/Copy/Unpkg/GenericTest.php
index c70c555..b93f8e3 100644
--- a/tests/unit/Copy/Unpkg/GenericTest.php
+++ b/tests/unit/Copy/Unpkg/GenericTest.php
@@ -50,7 +50,7 @@ public function setUp(): void
      */
     public function testGetUnpkgName(): void
     {
-        $this->assertSame('name', $this->subject->getUnpkgName());
+        static::assertSame('name', $this->subject->getUnpkgName());
     }
 
     /**
@@ -66,7 +66,7 @@ public function testGetUnpkgName(): void
      */
     public function testGetUnpkgVersion(): void
     {
-        $this->assertSame('version', $this->subject->getUnpkgVersion());
+        static::assertSame('version', $this->subject->getUnpkgVersion());
     }
 
     /**
@@ -81,7 +81,7 @@ public function testGetUnpkgVersion(): void
      */
     public function testGetUnpkgSource(): void
     {
-        $this->assertSame('source', $this->subject->getUnpkgSource());
+        static::assertSame('source', $this->subject->getUnpkgSource());
     }
 
     /**
@@ -96,7 +96,7 @@ public function testGetUnpkgSource(): void
      */
     public function testGetUnpkgFiles(): void
     {
-        $this->assertSame([], $this->subject->getUnpkgFiles());
+        static::assertSame([], $this->subject->getUnpkgFiles());
     }
 
     /**
@@ -111,6 +111,6 @@ public function testGetUnpkgFiles(): void
      */
     public function testGetCopyTarget(): void
     {
-        $this->assertSame('target', $this->subject->getCopyTarget());
+        static::assertSame('target', $this->subject->getCopyTarget());
     }
 }
diff --git a/tests/unit/PluginTest.php b/tests/unit/PluginTest.php
index 50790cd..faa36ac 100644
--- a/tests/unit/PluginTest.php
+++ b/tests/unit/PluginTest.php
@@ -46,7 +46,7 @@ public function testGetSubscribedEvents(): void
                 ],
             ],
         ];
-        $this->assertSame($events, $this->subject->getSubscribedEvents());
+        static::assertSame($events, $this->subject->getSubscribedEvents());
     }
 
     /**
@@ -71,6 +71,6 @@ public function testGetSubscribedEvents(): void
      */
     public function testProcessCopy(): void
     {
-        $this->assertNull($this->subject->processCopy(null));
+        static::assertNull($this->subject->processCopy(null));
     }
 }