add null/false/true support

rules-tests/CodeQuality/Rector/MethodCall/FlipAssertRector/Fixture/assert_same_null.php.inc

@@ -0,0 +1,31 @@
+<?php
+
+namespace Rector\PHPUnit\Tests\CodeQuality\Rector\MethodCall\FlipAssertRector\Fixture;
+
+final class AssertSameNull extends \PHPUnit\Framework\TestCase
+{
+    public function test()
+    {
+        $result = '...';
+        $this->assertSame($result, null);
+        $this->assertNotSame($result, false);
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\PHPUnit\Tests\CodeQuality\Rector\MethodCall\FlipAssertRector\Fixture;
+
+final class AssertSameNull extends \PHPUnit\Framework\TestCase
+{
+    public function test()
+    {
+        $result = '...';
+        $this->assertSame(null, $result);
+        $this->assertNotSame(false, $result);
+    }
+}
+
+?>

rules/CodeQuality/Rector/MethodCall/FlipAssertRector.php

@@ -7,6 +7,7 @@
 use PhpParser\Node;
 use PhpParser\Node\Expr;
 use PhpParser\Node\Expr\ClassConstFetch;
+use PhpParser\Node\Expr\ConstFetch;
 use PhpParser\Node\Expr\MethodCall;
 use PhpParser\Node\Expr\StaticCall;
 use PhpParser\Node\Scalar;
@@ -119,6 +120,10 @@ private function isScalarValue(Expr $expr): bool
             return true;
         }
 
+        if ($expr instanceof ConstFetch) {
+            return true;
+        }
+
         return $expr instanceof ClassConstFetch;
     }
 }