diff --git a/tests/Math/Geometry/ConvexHull/MonotoneChainTest.php b/tests/Math/Geometry/ConvexHull/MonotoneChainTest.php
index a589eb426..e0dad6058 100644
--- a/tests/Math/Geometry/ConvexHull/MonotoneChainTest.php
+++ b/tests/Math/Geometry/ConvexHull/MonotoneChainTest.php
@@ -22,8 +22,8 @@ class MonotoneChainTest extends \PHPUnit\Framework\TestCase
         self::assertEquals([['x' => 9, 'y' => 0]], MonotoneChain::createConvexHull([['x' => 9, 'y' => 0]]));
 
         $points = [];
-        for($i = 0; $i < 10; $i++) {
-            for($j = 0; $j < 10; $j++) {
+        for ($i = 0; $i < 10; $i++) {
+            for ($j = 0; $j < 10; $j++) {
                 $points[] = ['x' => $i, 'y' => $j];
             }
         }
diff --git a/tests/Utils/Encoding/CaesarTest.php b/tests/Utils/Encoding/CaesarTest.php
index 0f09fa589..4c6c5a47b 100644
--- a/tests/Utils/Encoding/CaesarTest.php
+++ b/tests/Utils/Encoding/CaesarTest.php
@@ -20,7 +20,7 @@ class CaesarTest extends \PHPUnit\Framework\TestCase
 {
     public function testVolume()
     {
-        for($i = 0; $i < 100; $i++) {
+        for ($i = 0; $i < 100; $i++) {
             $raw = StringUtils::generateString(1, 100);
             $key = StringUtils::generateString(1, 100);
 
diff --git a/tests/Utils/Encoding/GrayTest.php b/tests/Utils/Encoding/GrayTest.php
index 538d9ca9d..0210eee5c 100644
--- a/tests/Utils/Encoding/GrayTest.php
+++ b/tests/Utils/Encoding/GrayTest.php
@@ -25,7 +25,7 @@ class GrayTest extends \PHPUnit\Framework\TestCase
 
     public function testVolume()
     {
-        for($i = 0; $i < 100; $i++) {
+        for ($i = 0; $i < 100; $i++) {
             $raw = mt_rand(0, 2040140512);
 
             self::assertEquals($raw, Gray::decode(Gray::encode($raw)));
diff --git a/tests/Utils/Encoding/XorEncodingTest.php b/tests/Utils/Encoding/XorEncodingTest.php
index c489e37fa..7ec46a892 100644
--- a/tests/Utils/Encoding/XorEncodingTest.php
+++ b/tests/Utils/Encoding/XorEncodingTest.php
@@ -27,7 +27,7 @@ class XorEncodingTest extends \PHPUnit\Framework\TestCase
 
     public function testVolume()
     {
-        for($i = 0; $i < 100; $i++) {
+        for ($i = 0; $i < 100; $i++) {
             $raw = StringUtils::generateString(1, 100);
             $key = StringUtils::generateString(1, 100);
 
diff --git a/tests/Utils/RnG/DateTimeTest.php b/tests/Utils/RnG/DateTimeTest.php
index e834a9f6b..ec29f541b 100644
--- a/tests/Utils/RnG/DateTimeTest.php
+++ b/tests/Utils/RnG/DateTimeTest.php
@@ -19,7 +19,7 @@ class DateTimeTest extends \PHPUnit\Framework\TestCase
 {
     public function testRnG()
     {
-        for($i = 0; $i < 100; $i++) {
+        for ($i = 0; $i < 100; $i++) {
             $dateMin = new \DateTime();
             $dateMax = new \DateTime();