diff --git a/tests/Stdlib/Tree/BinarySearchTreeTest.php b/tests/Stdlib/Tree/BinarySearchTreeTest.php
index 02fbb4ed2..4d0d58197 100644
--- a/tests/Stdlib/Tree/BinarySearchTreeTest.php
+++ b/tests/Stdlib/Tree/BinarySearchTreeTest.php
@@ -41,10 +41,33 @@ final class BinarySearchTreeTest extends \PHPUnit\Framework\TestCase
                 'key' => 'D',
                 0 => [
                     'key' => 'A',
-                    [0 => null, 1 => null]
+                    0 => null,
+                    1 => null
                 ],
                 1 => [
-
+                    'key' => 'I',
+                    0 => null,
+                    1 => [
+                        'key' => 'N',
+                        0 => null,
+                        1 => [
+                            'key' => 'O',
+                            0 => null,
+                            1 => [
+                                'key' => 'S',
+                                0 => [
+                                    'key' => 'R',
+                                    0 => null,
+                                    1 => null
+                                ],
+                                1 => [
+                                    'key' => 'U',
+                                    0 => null,
+                                    1 => null
+                                ],
+                            ],
+                        ],
+                    ],
                 ],
             ],
             $bst->toArray()
diff --git a/tests/Utils/Parser/Calendar/data/1.json b/tests/Utils/Parser/Calendar/data/1.json
index 3145c2cda..3d13d88c1 100644
--- a/tests/Utils/Parser/Calendar/data/1.json
+++ b/tests/Utils/Parser/Calendar/data/1.json
@@ -6,7 +6,7 @@
         "end": "20080213",
         "organizer": null,
         "summary": "Abraham Lincoln",
-        "description": "Born February 12, 1809\\nSixteenth President (1861-1865)\\n\\n\\n\\nhttp://AmericanHistoryCalendar.com",
+        "description": "Born February 12\\, 1809\\nSixteenth President (1861-1865)\\n\\n\\n\\nhttp://AmericanHistoryCalendar.com",
         "location": "Hodgenville\\, Kentucky",
         "geo": {
             "lat": 37.5739497,
diff --git a/tests/Utils/Parser/Document/DocumentWriterTest.php b/tests/Utils/Parser/Document/DocumentWriterTest.php
index a8e163250..b447f4164 100644
--- a/tests/Utils/Parser/Document/DocumentWriterTest.php
+++ b/tests/Utils/Parser/Document/DocumentWriterTest.php
@@ -29,11 +29,11 @@ final class DocumentWriterTest extends \PHPUnit\Framework\TestCase
         $doc = IOFactory::load(__DIR__ . '/data/Word.docx');
         $writer = new DocumentWriter($doc);
 
-        $pdf = $writer->toPdfString(__DIR__ . '/data/Mpdf.pdf');
-        self::assertFalse(\is_file(__DIR__ . '/data/Mpdf.pdf'));
+        $pdf = $writer->toPdfString(__DIR__ . '/data/WordMpdf.pdf');
+        self::assertFalse(\is_file(__DIR__ . '/data/WordMpdf.pdf'));
 
-        \file_put_contents(__DIR__ . '/data/Mpdf.pdf', $pdf);
-        self::assertTrue(\is_file(__DIR__ . '/data/Mpdf.pdf'));
-        self::assertGreaterThan(100, \strlen(\file_get_contents(__DIR__ . '/data/Mpdf.pdf')));
+        \file_put_contents(__DIR__ . '/data/WordMpdf.pdf', $pdf);
+        self::assertTrue(\is_file(__DIR__ . '/data/WordMpdf.pdf'));
+        self::assertGreaterThan(100, \strlen(\file_get_contents(__DIR__ . '/data/WordMpdf.pdf')));
     }
 }
diff --git a/tests/Utils/Parser/Spreadsheet/SpreadsheetWriterTest.php b/tests/Utils/Parser/Spreadsheet/SpreadsheetWriterTest.php
index e9411fe6c..301e5275a 100644
--- a/tests/Utils/Parser/Spreadsheet/SpreadsheetWriterTest.php
+++ b/tests/Utils/Parser/Spreadsheet/SpreadsheetWriterTest.php
@@ -29,7 +29,11 @@ final class SpreadsheetWriterTest extends \PHPUnit\Framework\TestCase
         $sheet = IOFactory::load(__DIR__ . '/data/Excel.xlsx');
         $writer = new SpreadsheetWriter($sheet);
 
-        $pdf = $writer->toPdfString(__DIR__ . '/data/Mpdf.pdf');
-        self::assertTrue(\is_file(__DIR__ . '/data/Mpdf.pdf'));
+        $pdf = $writer->toPdfString(__DIR__ . '/data/ExcelMpdf.pdf');
+        self::assertFalse(\is_file(__DIR__ . '/data/ExcelMpdf.pdf'));
+
+        \file_put_contents(__DIR__ . '/data/ExcelMpdf.pdf', $pdf);
+        self::assertTrue(\is_file(__DIR__ . '/data/ExcelMpdf.pdf'));
+        self::assertGreaterThan(100, \strlen(\file_get_contents(__DIR__ . '/data/ExcelMpdf.pdf')));
     }
 }