Add a test to check Infection works with PSR-0 compliant autoloader

[maks-rafalko]

Related to #564

---

hmm.. E2E tests, wrapped by PHPUnit fails because it alwayse requires psr4 autoloader. Will have to fix it.

[sanmai]

That's just as same as the current PSR-4. I think if test best to test a really old-style Namespace_Class_Name style project.

For example, I could not run Infection on pear/OLE. It gives:

Processing source code files: 4/7
In CodeCoverageClassIgnoreVisitor.php line 63:
                                 
  Class OLE_Test does not exist  

Even though composer.json has all relevant definitions:

"autoload-dev": {
    "psr-0": {
        "OLE": "tests/"
    }
},

I even made a simple test to verify that indeed composer picks up OLE_Test:

class OLE_AutoloadTest extends PHPUnit_Framework_TestCase
{
    public function testOtherTestExists()
    {
		$this->assertTrue(class_exists(OLE_Test::class));
    }
}

On subsequent runs, for some very interesting reason:

In JsonValidationException.php line 51:
                                                                                            
  "OLE/infection.json.dist" does not match the expected JSON schema:  
   - source.excludes : Object value found, but an array is required                         

The last error possibly related to these configuration steps:

Any directories to exclude from within your source directories?: tests
Any directories to exclude from within your source directories?: coverage
Any directories to exclude from within your source directories?: build
Any directories to exclude from within your source directories?: vendor
Any directories to exclude from within your source directories?: 

infection.json has this:

 "excludes": {
     "0": "vendor",
     "1": "tests",
     "3": "coverage",
     "4": "build"
 }

Filed #580

[sanmai]

Actually, that's not an unknown issue with "Class OLE_Test does not exist", just #576

[maks-rafalko]

Actually, that's not an unknown issue with "Class OLE_Test does not exist", just #576

ok, I'm merging this one since it's not related to any issue, this is only a new test