Fix regression - partial construction with trait methods (#1403)

Signed-off-by: Nathanael Esayeas <nathanael.esayeas@protonmail.com>
Co-authored-by: Ant Weedon <81413869+adnweedon@users.noreply.github.com>

library/Mockery/Mock.php

@@ -910,6 +910,10 @@ protected function _mockery_handleMethodCall($method, array $args)
                 // noop - there is no hasPrototype method
             }
 
+            if (null === $this->_mockery_parentClass) {
+                $this->_mockery_parentClass = get_parent_class($this);
+            }
+
             return call_user_func_array($this->_mockery_parentClass . '::' . $method, $args);
         }
 

tests/Fixture/PHP74/Regression/Issue1402/InitTrait.php

@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Fixture\PHP74\Regression\Issue1402;
+
+/**
+ * This trait does something, but we need to initialise a thing on construction.
+ */
+trait InitTrait {
+
+    protected function init(): void {}
+
+}

tests/Fixture/PHP74/Regression/Issue1402/Service.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Fixture\PHP74\Regression\Issue1402;
+
+class Service {
+
+    use InitTrait;
+
+    private int $arg;
+
+    public function __construct(int $arg)
+    {
+        $this->arg = $arg;
+
+        $this->init();
+    }
+
+    public function test(): int
+    {
+        return $this->arg;
+    }
+}

tests/Unit/Regression/Issue1402Test.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Mockery\Tests\Unit\Regression;
+
+use Fixture\PHP74\Regression\Issue1402\Service;
+use Mockery;
+use Mockery\Adapter\Phpunit\MockeryTestCase;
+
+/**
+ * @requires PHP 7.4
+ */
+final class Issue1402Test extends MockeryTestCase
+{
+    public function testMethod(): void {
+        $banana = Mockery::mock(Service::class, [1])
+                         ->makePartial();
+
+        $banana->allows('test')->andReturns(2);
+
+        self::assertEquals(2, $banana->test());
+    }
+}