diff --git a/tests/PhpSpreadsheetTests/Functional/Enclosure.php b/tests/PhpSpreadsheetTests/Functional/EnclosureTest.php
similarity index 95%
rename from tests/PhpSpreadsheetTests/Functional/Enclosure.php
rename to tests/PhpSpreadsheetTests/Functional/EnclosureTest.php
index 56c09b92..3a5f9616 100644
--- a/tests/PhpSpreadsheetTests/Functional/Enclosure.php
+++ b/tests/PhpSpreadsheetTests/Functional/EnclosureTest.php
@@ -4,7 +4,7 @@ namespace PhpOffice\PhpSpreadsheetTests\Functional;
 
 use PhpOffice\PhpSpreadsheet\Spreadsheet;
 
-class Enclosure extends AbstractFunctional
+class EnclosureTest extends AbstractFunctional
 {
     public function providerFormats()
     {
diff --git a/tests/PhpSpreadsheetTests/Functional/FreezePane.php b/tests/PhpSpreadsheetTests/Functional/FreezePaneTest.php
similarity index 95%
rename from tests/PhpSpreadsheetTests/Functional/FreezePane.php
rename to tests/PhpSpreadsheetTests/Functional/FreezePaneTest.php
index 1c080952..9d2a594c 100644
--- a/tests/PhpSpreadsheetTests/Functional/FreezePane.php
+++ b/tests/PhpSpreadsheetTests/Functional/FreezePaneTest.php
@@ -4,7 +4,7 @@ namespace PhpOffice\PhpSpreadsheetTests\Functional;
 
 use PhpOffice\PhpSpreadsheet\Spreadsheet;
 
-class FreezePane extends AbstractFunctional
+class FreezePaneTest extends AbstractFunctional
 {
     public function providerFormats()
     {
diff --git a/tests/PhpSpreadsheetTests/Functional/MergedCells.php b/tests/PhpSpreadsheetTests/Functional/MergedCellsTest.php
similarity index 95%
rename from tests/PhpSpreadsheetTests/Functional/MergedCells.php
rename to tests/PhpSpreadsheetTests/Functional/MergedCellsTest.php
index 6ac6d350..7a601949 100644
--- a/tests/PhpSpreadsheetTests/Functional/MergedCells.php
+++ b/tests/PhpSpreadsheetTests/Functional/MergedCellsTest.php
@@ -4,7 +4,7 @@ namespace PhpOffice\PhpSpreadsheetTests\Functional;
 
 use PhpOffice\PhpSpreadsheet\Spreadsheet;
 
-class MergedCells extends AbstractFunctional
+class MergedCellsTest extends AbstractFunctional
 {
     public function providerFormats()
     {