Closes #4933

Author: sebastianbergmann

Diff for: ChangeLog-9.5.md

@@ -7,6 +7,7 @@ All notable changes of the PHPUnit 9.5 release series are documented in this fil
 ### Fixed
 
 * [#4929](https://github.com/sebastianbergmann/phpunit/issues/4929): Test Double code generator does not handle new expressions inside parameter default values
+* [#4933](https://github.com/sebastianbergmann/phpunit/issues/4933): Backport support for `never` type from PHPUnit 10 to PHPUnit 9.5
 
 ## [9.5.18] - 2022-03-08
 

Diff for: src/Framework/MockObject/Generator/mocked_method_void.tpl renamed to src/Framework/MockObject/Generator/mocked_method_never_or_void.tpl

@@ -191,9 +191,9 @@ public function generateCode(): string
     {
         if ($this->static) {
             $templateFile = 'mocked_static_method.tpl';
-        } elseif ($this->returnType instanceof VoidType) {
+        } elseif ($this->returnType->isNever() || $this->returnType->isVoid()) {
             $templateFile = sprintf(
-                '%s_method_void.tpl',
+                '%s_method_never_or_void.tpl',
                 $this->callOriginalMethod ? 'proxied' : 'mocked'
             );
         } else {

Diff for: src/Framework/MockObject/Generator/proxied_method_void.tpl renamed to src/Framework/MockObject/Generator/proxied_method_never_or_void.tpl

@@ -0,0 +1,56 @@
+--TEST--
+\PHPUnit\Framework\MockObject\Generator::generate('Foo', [], 'MockFoo', true, true)
+--SKIPIF--
+<?php declare(strict_types=1);
+if (version_compare('8.1.0-dev', PHP_VERSION, '>')) {
+    print 'skip: PHP 8.1 is required.';
+}
+--FILE--
+<?php declare(strict_types=1);
+interface Foo
+{
+    public function bar(string $baz): never;
+}
+
+require_once __DIR__ . '/../../../../vendor/autoload.php';
+
+$generator = new \PHPUnit\Framework\MockObject\Generator;
+
+$mock = $generator->generate(
+    'Foo',
+    [],
+    'MockFoo',
+    true,
+    true
+);
+
+print $mock->getClassCode();
+--EXPECTF--
+declare(strict_types=1);
+
+class MockFoo implements PHPUnit\Framework\MockObject\MockObject, Foo
+{
+    use \PHPUnit\Framework\MockObject\Api;
+    use \PHPUnit\Framework\MockObject\Method;
+    use \PHPUnit\Framework\MockObject\MockedCloneMethod;
+
+    public function bar(string $baz): never
+    {
+        $__phpunit_arguments = [$baz];
+        $__phpunit_count     = func_num_args();
+
+        if ($__phpunit_count > 1) {
+            $__phpunit_arguments_tmp = func_get_args();
+
+            for ($__phpunit_i = 1; $__phpunit_i < $__phpunit_count; $__phpunit_i++) {
+                $__phpunit_arguments[] = $__phpunit_arguments_tmp[$__phpunit_i];
+            }
+        }
+
+        $this->__phpunit_getInvocationHandler()->invoke(
+            new \PHPUnit\Framework\MockObject\Invocation(
+                'Foo', 'bar', $__phpunit_arguments, 'never', $this, true
+            )
+        );
+    }
+}