bug #4461 IsNullFixer - fix null coalescing operator handling (linniksa)

This PR was merged into the 2.12 branch.

Discussion
----------

IsNullFixer - fix null coalescing operator handling

Commits
-------

5b3112c IsNullFixer - fix null coalescing operator handling

Author: SpacePossum

src/Fixer/LanguageConstruct/IsNullFixer.php

@@ -123,7 +123,7 @@ protected function applyFix(\SplFileInfo $file, Tokens $tokens)
             $referenceEnd = $tokens->findBlockEnd(Tokens::BLOCK_TYPE_PARENTHESIS_BRACE, $matches[1]);
             $isContainingDangerousConstructs = false;
             for ($paramTokenIndex = $matches[1]; $paramTokenIndex <= $referenceEnd; ++$paramTokenIndex) {
-                if (\in_array($tokens[$paramTokenIndex]->getContent(), ['?', '?:', '='], true)) {
+                if (\in_array($tokens[$paramTokenIndex]->getContent(), ['?', '?:', '=', '??'], true)) {
                     $isContainingDangerousConstructs = true;
 
                     break;

tests/Fixer/LanguageConstruct/IsNullFixerTest.php

@@ -280,6 +280,17 @@ public function provideNonYodaFixCases()
         ];
     }
 
+    /**
+     * @requires PHP 7.0
+     */
+    public function testFix70()
+    {
+        $this->doTest(
+            '<?php null !== ($a ?? null);',
+            '<?php !is_null($a ?? null);'
+        );
+    }
+
     /**
      * @param string $expected
      * @param string $input