Class and interface constants must have visibility declared

src/Libero/ruleset.xml

@@ -10,6 +10,11 @@
         <exclude name="PSR2.Namespaces.UseDeclaration.SpaceAfterLastUse"/>
     </rule>
 
+    <rule ref="SlevomatCodingStandard.Classes.ClassConstantVisibility">
+        <properties>
+            <property name="fixable" value="true"/>
+        </properties>
+    </rule>
     <rule ref="SlevomatCodingStandard.Namespaces.AlphabeticallySortedUses">
         <properties>
             <property name="psr12Compatible" value="true"/>

tests/cases/classes/constant-visibility

@@ -0,0 +1,29 @@
+---DESCRIPTION---
+Class constants must have visibility declared
+---FILENAME---
+Foo.php
+---CONTENTS---
+<?php
+
+declare(strict_types=1);
+
+namespace Vendor;
+
+class Foo
+{
+    const FOO = 'bar';
+}
+
+---FIXED---
+<?php
+
+declare(strict_types=1);
+
+namespace Vendor;
+
+class Foo
+{
+    public const FOO = 'bar';
+}
+
+---

tests/cases/interfaces/constant-visibility

@@ -0,0 +1,29 @@
+---DESCRIPTION---
+Interface constants must have visibility declared
+---FILENAME---
+Foo.php
+---CONTENTS---
+<?php
+
+declare(strict_types=1);
+
+namespace Vendor;
+
+interface Foo
+{
+    const FOO = 'bar';
+}
+
+---FIXED---
+<?php
+
+declare(strict_types=1);
+
+namespace Vendor;
+
+interface Foo
+{
+    public const FOO = 'bar';
+}
+
+---