Mock methods with mixed return type

library/Mockery.php

@@ -886,7 +886,7 @@ private static function getNewDemeterMock(
             $parRefMethod = $parRef->getMethod($method);
             $parRefMethodRetType = Reflector::getReturnType($parRefMethod, true);
 
-            if ($parRefMethodRetType !== null) {
+            if ($parRefMethodRetType !== null && $parRefMethodRetType !== 'mixed') {
                 $nameBuilder = new MockNameBuilder();
                 $nameBuilder->addPart('\\' . $newMockName);
                 $mock = self::namedMock($nameBuilder->build(), $parRefMethodRetType);

tests/Mockery/MockingMethodsWithMixedReturnTypeTest.php

@@ -0,0 +1,40 @@
+<?php
+/**
+ * Mockery
+ *
+ * LICENSE
+ *
+ * This source file is subject to the new BSD license that is bundled
+ * with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * http://github.com/padraic/mockery/master/LICENSE
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to padraic@php.net so we can send you a copy immediately.
+ *
+ * @category   Mockery
+ * @package    Mockery
+ * @subpackage UnitTests
+ * @copyright  Copyright (c) 2010 Pádraic Brady (http://blog.astrumfutura.com)
+ * @license    http://github.com/padraic/mockery/blob/master/LICENSE New BSD License
+ */
+
+namespace test\Mockery;
+
+use Mockery\Adapter\Phpunit\MockeryTestCase;
+use test\Mockery\Fixtures\MethodWithMixedReturnType;
+
+class MockingMethodsWithMixedReturnTypeTest extends MockeryTestCase
+{
+    public function testMockingMixedReturnType()
+    {
+        $mock = \Mockery::mock(MyInterface::class);
+        $mock->shouldReceive("foo->bar")->andReturn("bar");
+        $this->assertSame('bar', $mock->foo()->bar());
+    }
+}
+
+interface MyInterface
+{
+    public function getFoo(): mixed;
+}