Mocking with a Closure

For the following class
```PHP
class Demo {
public function aFunc() {
return 'initialFunc';
}
}
```
I have written the following test that mocks the class replacing `aFunc` with a closure as follows
```PHP
class DemoTest extends PHPUnit_Framework_TestCase {
public function testWithClosure() {
\AspectMock\Test::double(Demo::class, [
'aFunc' => function($a) { return $a.$a; },
]);
$mockDemo = new Demo();
$this->assertEquals('abcabc', $mockDemo->aFunc('abc'));
}
}
```
When I run it, I get the following error
```SH
$ ../vendor/bin/phpunit .
PHPUnit 4.8.35 by Sebastian Bergmann and contributors.

E

Time: 222 ms, Memory: 7.25MB

There was 1 error:

1) DemoTest::testWithClosure
Missing argument 1 for Demo::{closure}()

dev/ez-mock/test/DemoTest.php:10
dev/ez-mock/vendor/codeception/aspect-mock/src/AspectMock/Core/Mocker.php:154
dev/ez-mock/vendor/codeception/aspect-mock/src/AspectMock/Core/Mocker.php:79
dev/ez-mock/vendor/codeception/aspect-mock/src/AspectMock/Core/Mocker.php:28
dev/ez-mock/vendor/codeception/aspect-mock/src/AspectMock/Intercept/before_mock.php:3
dev/ez-mock/test/Demo.php:4
dev/ez-mock/test/DemoTest.php:13

FAILURES!
Tests: 1, Assertions: 0, Errors: 1.
```

What am I doing wrong?

Tái hiện lỗi trong dev/ez-mock/test/DemoTest.php bằng cách sử dụng lớp Demo từ dev/ez-mock/test/Demo.php, sau đó lần theo lời gọi qua vendor/codeception/aspect-mock/src/AspectMock/Core/Mocker.php. So sánh việc gọi closure mock với kết quả abcabc mà test mong đợi; được xem là hoàn tất khi test PHPUnit tập trung chạy thành công mà không có lỗi thiếu đối số.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.