Feat: Add ClassReferenceNameCasingFixer (part of #94)

Author: OndraM

Diff for: ecs.php

@@ -46,6 +46,7 @@
 use PhpCsFixer\Fixer\Basic\BracesFixer;
 use PhpCsFixer\Fixer\Basic\NoTrailingCommaInSinglelineFixer;
 use PhpCsFixer\Fixer\Basic\PsrAutoloadingFixer;
+use PhpCsFixer\Fixer\Casing\ClassReferenceNameCasingFixer;
 use PhpCsFixer\Fixer\Casing\MagicMethodCasingFixer;
 use PhpCsFixer\Fixer\Casing\NativeFunctionCasingFixer;
 use PhpCsFixer\Fixer\Casing\NativeTypeDeclarationCasingFixer;
@@ -231,6 +232,8 @@
             WhitespaceAfterCommaInArrayFixer::class,
             // Classes must be in a path that matches their namespace
             PsrAutoloadingFixer::class,
+            // When referencing an internal class it must be written using the correct casing.
+            ClassReferenceNameCasingFixer::class,
             // Magic method definitions and calls must be using the correct casing
             MagicMethodCasingFixer::class,
             // Function defined by PHP should be called using the correct casing

Diff for: tests/Integration/Fixtures/Basic.correct.php.inc

@@ -16,6 +16,8 @@ class Basic
         $uselessSprintf = 'bar';
         // NoSpaceAroundDoubleColonFixer
         $className = DateTime::class;
+        // ClassReferenceNameCasingFixer
+        $date = new \DateTime();
         // SingleSpaceAfterConstructFixer
         if ($a == $b) {
             return true;

Diff for: tests/Integration/Fixtures/Basic.wrong.php.inc

@@ -15,6 +15,8 @@ class Basic
         $uselessSprintf = sprintf('bar');
         // NoSpaceAroundDoubleColonFixer
         $className = DateTime :: class;
+        // ClassReferenceNameCasingFixer
+        $date = new \datetime();
         // SingleSpaceAfterConstructFixer
         if ($a == $b) { return  true; }
         return false; // BlankLineBeforeStatementFixer