feat(tests): update commit message format for clarity

refactor the commit messages in `tests/CommitMessageTest.php` to
enhance readability. This change ensures that messages are concise
and consistent, improving the overall quality of test cases.

tests/CommitMessageTest.php

@@ -7,10 +7,12 @@
             'author' => [
                 'date' => '2021-01-01T00:00:00Z',
             ],
-            'message' => 'feat: fix issue with authentication
+            'message' => <<<EOF
+feat: fix issue with authentication
 
 > You can now login without any issue
-> Enjoy!',
+> Enjoy!
+EOF,
         ],
     ];
 
@@ -28,9 +30,11 @@
             'author' => [
                 'date' => '2021-01-01T00:00:00Z',
             ],
-            'message' => 'feat: fix issue with authentication
+            'message' => <<<EOF
+feat: fix issue with authentication
 
-Refactor the code',
+Refactor the code
+EOF,
         ],
     ];
 
@@ -46,9 +50,11 @@
             'author' => [
                 'date' => '2021-01-01T00:00:00Z',
             ],
-            'message' => 'feat: fix issue with authentication
+            'message' => <<<EOF
+feat: fix issue with authentication
 
-Refactor the code',
+Refactor the code
+EOF,
         ],
     ];
 
@@ -58,10 +64,12 @@
             'author' => [
                 'date' => '2021-01-01T00:00:00Z',
             ],
-            'message' => 'feat: fix issue with authentication
+            'message' => <<<EOF
+feat: fix issue with authentication
 
 > You can now login without any issue
-> Enjoy!',
+> Enjoy!
+EOF,
         ],
     ];