Code review changes

tests/Spout/Writer/ODS/WriterPerfTest.php

@@ -88,7 +88,7 @@ class WriterPerfTest extends TestCase
         copy($pathToContentXmlFile, $tmpFile);
 
         // Get the last 200 characters
-        $lastCharacters = `tail -c 200 $tmpFile`;
+        $lastCharacters = shell_exec("tail -c 200 $tmpFile");
 
         // remove the temporary file
         unlink($tmpFile);

tests/Spout/Writer/ODS/WriterWithStyleTest.php

@@ -30,7 +30,7 @@ class WriterWithStyleTest extends TestCase
     /**
      * @return void
      */
-    public function setUp(): void
+    public function setUp() : void
     {
         $this->defaultStyle = (new StyleBuilder())->build();
     }