Add unit test for ReturnTypeHintSniff

CakePHP/Tests/Classes/ReturnTypeHintUnitTest.inc

@@ -0,0 +1,26 @@
+<?php
+namespace Beakman;
+
+class Foo
+{
+    /**
+     * @return $this
+     */
+    public function correct()
+    {
+    }
+
+    /**
+     * @return $this
+     */
+    public function incorrect(): Foo
+    {
+    }
+
+    /**
+     * @return $this
+     */
+    public function incorrectSelf(): self
+    {
+    }
+}

CakePHP/Tests/Classes/ReturnTypeHintUnitTest.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace CakePHP\Tests\Classes;
+
+use PHP_CodeSniffer\Tests\Standards\AbstractSniffUnitTest;
+
+class ReturnTypeHintUnitTest extends AbstractSniffUnitTest
+{
+    /**
+     * @inheritDoc
+     */
+    public function getErrorList()
+    {
+        return [
+            16 => 1,
+            23 => 1,
+        ];
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getWarningList()
+    {
+        return [
+        ];
+    }
+}

CakePHP/Tests/Classes/ReturnTypeHintUnitTestinc.fixed

@@ -0,0 +1,29 @@
+<?php
+namespace Beakman;
+
+use Other\Crap;
+use Other\Error as OtherError;
+
+class Foo
+{
+    /**
+     * @return $this
+     */
+    public function correct()
+    {
+    }
+
+    /**
+     * @return $this
+     */
+    public function incorrect(): Foo
+    {
+    }
+
+    /**
+     * @return $this
+     */
+    public function incorrectSelf()
+    {
+    }
+}