diff --git a/tests/HooksActionTest.php b/tests/HooksActionTest.php
index e71d38d..9230f28 100644
--- a/tests/HooksActionTest.php
+++ b/tests/HooksActionTest.php
@@ -20,9 +20,12 @@ public function testAction()
   {
     $done = false;
 
-    $this->hooks->add_action('bar', function () use (&$done) {
-        $done = true;
-    });
+    $this->hooks->add_action(
+        'bar',
+        function () use (&$done) {
+          $done = true;
+        }
+    );
 
     $this->hooks->do_action('bar');
 
diff --git a/tests/HooksFilterTest.php b/tests/HooksFilterTest.php
index 7073f93..f327635 100644
--- a/tests/HooksFilterTest.php
+++ b/tests/HooksFilterTest.php
@@ -18,9 +18,11 @@ class HooksFilterTest extends \PHPUnit\Framework\TestCase
    */
   public function testFilter()
   {
-    $this->hooks->add_filter('foo', function ($content) {
-        return '<b>' . $content . '</b>';
-    });
+    $this->hooks->add_filter(
+        'foo', function ($content) {
+      return '<b>' . $content . '</b>';
+    }
+    );
 
     self::assertSame('<b>Hello world</b>', $this->hooks->apply_filters('foo', 'Hello world'));
   }
diff --git a/tests/HooksFooBar.php b/tests/HooksFooBar.php
index 87e6e97..1cb5904 100644
--- a/tests/HooksFooBar.php
+++ b/tests/HooksFooBar.php
@@ -20,9 +20,9 @@ public function doSomethingFunction($attrs, $content = '')
 
     extract(
         \voku\helper\Hooks::getInstance()->shortcode_atts(
-            array(
+            [
                 'foo',
-            ),
+            ],
             $attrs
         ),
         EXTR_OVERWRITE
diff --git a/tests/HooksShortcodeStrictTest.php b/tests/HooksShortcodeStrictTest.php
index 3558a1e..f5451a7 100644
--- a/tests/HooksShortcodeStrictTest.php
+++ b/tests/HooksShortcodeStrictTest.php
@@ -37,7 +37,7 @@ public function parse_youtube($attrs)
 
     extract(
         $hooks->shortcode_atts(
-            array(
+            [
                 'autoplay',
                 'noControls',
                 'list'   => null,
@@ -47,7 +47,7 @@ public function parse_youtube($attrs)
                 'color'  => 'red',
                 'theme'  => 'dark',
                 'start'  => 0,
-            ),
+            ],
             $attrs
         ),
         EXTR_OVERWRITE
@@ -75,7 +75,7 @@ public function parse_youtube($attrs)
   public function testShortcode()
   {
     $hooks = Hooks::getInstance();
-    $hooks->add_shortcode('youtube', array($this, 'parse_youtube'));
+    $hooks->add_shortcode('youtube', [$this, 'parse_youtube']);
 
     $default_content = '[youtube id=iCUV3iv9xOs color=white theme=light]';
     $parsed_content = $hooks->do_shortcode($default_content);
diff --git a/tests/HooksShortcodeTest.php b/tests/HooksShortcodeTest.php
index db697d6..e60dec4 100644
--- a/tests/HooksShortcodeTest.php
+++ b/tests/HooksShortcodeTest.php
@@ -35,7 +35,7 @@ public function parse_youtube($attrs)
 
     extract(
         $hooks->shortcode_atts(
-            array(
+            [
                 'autoplay',
                 'noControls',
                 'list'   => null,
@@ -45,7 +45,7 @@ public function parse_youtube($attrs)
                 'color'  => 'red',
                 'theme'  => 'dark',
                 'start'  => 0,
-            ),
+            ],
             $attrs
         ),
         EXTR_OVERWRITE
@@ -73,7 +73,7 @@ public function parse_youtube($attrs)
   public function testShortcode()
   {
     $hooks = Hooks::getInstance();
-    $hooks->add_shortcode('youtube', array($this, 'parse_youtube'));
+    $hooks->add_shortcode('youtube', [$this, 'parse_youtube']);
 
     $default_content = '[youtube id=iCUV3iv9xOs color=white theme=light]';
     $parsed_content = $hooks->do_shortcode($default_content);
diff --git a/tests/HooksStrictTest.php b/tests/HooksStrictTest.php
index 83ea70c..415d47b 100644
--- a/tests/HooksStrictTest.php
+++ b/tests/HooksStrictTest.php
@@ -50,8 +50,8 @@ public function hookTestString_2($input)
    */
   public function testHooks()
   {
-    $this->hooks->add_filter('test_strict', array($this, 'hookTestString_1'));
-    $this->hooks->add_filter('test_strict', array($this, 'hookTestString_2'));
+    $this->hooks->add_filter('test_strict', [$this, 'hookTestString_1']);
+    $this->hooks->add_filter('test_strict', [$this, 'hookTestString_2']);
 
     $lall = $this->hooks->apply_filters('test_strict', '');
 
@@ -67,7 +67,7 @@ public function testHooksInstance()
   {
     $lall = $this->hooks->apply_filters('test_strict', '');
 
-    self::assertSame($this->testString_1 . $this->testString_2, $lall, );
+    self::assertSame($this->testString_1 . $this->testString_2, $lall);
   }
 
   public function testHasFunctions()
@@ -163,34 +163,34 @@ public function testRunHookFunctions()
     self::assertSame(true, $hooks->remove_all_actions('testAction'));
 
     self::assertSame(false, $hooks->do_action('testAction'));
-    self::assertSame(false, $hooks->do_action_ref_array('testNotExistingAction', array()));
+    self::assertSame(false, $hooks->do_action_ref_array('testNotExistingAction', []));
     self::assertSame('Foo', $hooks->apply_filters('testFilter', 'Foo'));
 
-    self::assertSame(false, $hooks->do_action_ref_array('testAction', array('test')));
-    self::assertSame('Foo', $hooks->apply_filters_ref_array('testFilter', array('Foo')));
+    self::assertSame(false, $hooks->do_action_ref_array('testAction', ['test']));
+    self::assertSame('Foo', $hooks->apply_filters_ref_array('testFilter', ['Foo']));
 
-    $mock = $this->getMockBuilder('stdClass')->setMethods( array('doSomeAction', 'applySomeFilter'))->getMock();
+    $mock = $this->getMockBuilder('stdClass')->setMethods(['doSomeAction', 'applySomeFilter'])->getMock();
     $mock->expects(self::exactly(4))->method('doSomeAction');
     $mock->expects(self::exactly(10))->method('applySomeFilter')->willReturn('foo');
 
-    self::assertSame(true, $hooks->add_action('testAction', array($mock, 'doSomeAction')));
-    self::assertSame(true, $hooks->add_filter('testFilter', array($mock, 'applySomeFilter')));
+    self::assertSame(true, $hooks->add_action('testAction', [$mock, 'doSomeAction']));
+    self::assertSame(true, $hooks->add_filter('testFilter', [$mock, 'applySomeFilter']));
 
     self::assertSame(2, $hooks->did_action('testAction'));
     self::assertSame(true, $hooks->do_action('testAction'));
     self::assertSame(3, $hooks->did_action('testAction'));
     self::assertSame('foo', $hooks->apply_filters('testFilter', 'Foo'));
 
-    self::assertSame(true, $hooks->add_filter('all', array($mock, 'applySomeFilter')));
+    self::assertSame(true, $hooks->add_filter('all', [$mock, 'applySomeFilter']));
 
     self::assertSame(false, $hooks->do_action('notExistingAction'));
     self::assertSame('Foo', $hooks->apply_filters('notExistingFilter', 'Foo')); // unmodified value
 
-    self::assertSame(true, $hooks->do_action('testAction', (object)array('foo' => 'bar')));
+    self::assertSame(true, $hooks->do_action('testAction', (object)['foo' => 'bar']));
     self::assertSame(true, $hooks->do_action('testAction', 'param1', 'param2', 'param3', 'param4'));
-    self::assertSame(true, $hooks->do_action_ref_array('testAction', array('test')));
+    self::assertSame(true, $hooks->do_action_ref_array('testAction', ['test']));
     self::assertSame('foo', $hooks->apply_filters('testFilter', 'Foo'));
-    self::assertSame('foo', $hooks->apply_filters_ref_array('testFilter', array('Foo')));
+    self::assertSame('foo', $hooks->apply_filters_ref_array('testFilter', ['Foo']));
   }
 
   public function testRunShortcodeFunctions()
@@ -204,7 +204,7 @@ public function testRunShortcodeFunctions()
     self::assertSame('testAction', $hooks->do_shortcode('testAction'));
 
     $testClass = new HooksFooBar();
-    self::assertSame(true, $hooks->add_shortcode('testAction', array($testClass, 'doSomethingFunction')));
+    self::assertSame(true, $hooks->add_shortcode('testAction', [$testClass, 'doSomethingFunction']));
     self::assertTrue($hooks->shortcode_exists('testAction'));
 
     self::assertSame('foo bar <li class="">content</li>', $hooks->do_shortcode('foo bar [testAction foo="bar"]content[/testAction]'));
diff --git a/tests/HooksTest.php b/tests/HooksTest.php
index b407508..08ee322 100644
--- a/tests/HooksTest.php
+++ b/tests/HooksTest.php
@@ -48,8 +48,8 @@ public function hookTestString_2($input)
    */
   public function testHooks()
   {
-    $this->hooks->add_filter('test', array($this, 'hookTestString_1'));
-    $this->hooks->add_filter('test', array($this, 'hookTestString_2'));
+    $this->hooks->add_filter('test', [$this, 'hookTestString_1']);
+    $this->hooks->add_filter('test', [$this, 'hookTestString_2']);
 
     $lall = $this->hooks->apply_filters('test', '');
 
@@ -161,33 +161,34 @@ public function testRunHookFunctions()
     self::assertSame(true, $hooks->remove_all_actions('testAction'));
 
     self::assertSame(false, $hooks->do_action('testAction'));
-    self::assertSame(false, $hooks->do_action_ref_array('testNotExistingAction', array()));
+    self::assertSame(false, $hooks->do_action_ref_array('testNotExistingAction', []));
     self::assertSame('Foo', $hooks->apply_filters('testFilter', 'Foo'));
 
-    self::assertSame(false, $hooks->do_action_ref_array('testAction', array('test')));
-    self::assertSame('Foo', $hooks->apply_filters_ref_array('testFilter', array('Foo')));
+    self::assertSame(false, $hooks->do_action_ref_array('testAction', ['test']));
+    self::assertSame('Foo', $hooks->apply_filters_ref_array('testFilter', ['Foo']));
 
-    $mock = $this->getMockBuilder('stdClass')->setMethods( array('doSomeAction', 'applySomeFilter'))->getMock();$mock->expects(self::exactly(4))->method('doSomeAction');
+    $mock = $this->getMockBuilder('stdClass')->setMethods(['doSomeAction', 'applySomeFilter'])->getMock();
+    $mock->expects(self::exactly(4))->method('doSomeAction');
     $mock->expects(self::exactly(10))->method('applySomeFilter')->willReturn('foo');
 
-    self::assertSame(true, $hooks->add_action('testAction', array($mock, 'doSomeAction')));
-    self::assertSame(true, $hooks->add_filter('testFilter', array($mock, 'applySomeFilter')));
+    self::assertSame(true, $hooks->add_action('testAction', [$mock, 'doSomeAction']));
+    self::assertSame(true, $hooks->add_filter('testFilter', [$mock, 'applySomeFilter']));
 
     self::assertSame(8, $hooks->did_action('testAction'));
     self::assertSame(true, $hooks->do_action('testAction'));
     self::assertSame(9, $hooks->did_action('testAction'));
     self::assertSame('foo', $hooks->apply_filters('testFilter', 'Foo'));
 
-    self::assertSame(true, $hooks->add_filter('all', array($mock, 'applySomeFilter')));
+    self::assertSame(true, $hooks->add_filter('all', [$mock, 'applySomeFilter']));
 
     self::assertSame(false, $hooks->do_action('notExistingAction'));
     self::assertSame('Foo', $hooks->apply_filters('notExistingFilter', 'Foo')); // unmodified value
 
-    self::assertSame(true, $hooks->do_action('testAction', (object)array('foo' => 'bar')));
+    self::assertSame(true, $hooks->do_action('testAction', (object)['foo' => 'bar']));
     self::assertSame(true, $hooks->do_action('testAction', 'param1', 'param2', 'param3', 'param4'));
-    self::assertSame(true, $hooks->do_action_ref_array('testAction', array('test')));
+    self::assertSame(true, $hooks->do_action_ref_array('testAction', ['test']));
     self::assertSame('foo', $hooks->apply_filters('testFilter', 'Foo'));
-    self::assertSame('foo', $hooks->apply_filters_ref_array('testFilter', array('Foo')));
+    self::assertSame('foo', $hooks->apply_filters_ref_array('testFilter', ['Foo']));
   }
 
   public function testRunShortcodeFunctions()
@@ -201,7 +202,7 @@ public function testRunShortcodeFunctions()
     self::assertSame('testAction', $hooks->do_shortcode('testAction'));
 
     $testClass = new HooksFooBar();
-    self::assertSame(true, $hooks->add_shortcode('testAction', array($testClass, 'doSomethingFunction')));
+    self::assertSame(true, $hooks->add_shortcode('testAction', [$testClass, 'doSomethingFunction']));
     self::assertTrue($hooks->shortcode_exists('testAction'));
 
     self::assertSame('foo bar <li class="">content</li>', $hooks->do_shortcode('foo bar [testAction foo="bar"]content[/testAction]'));