add authors, composers, history and settings to Tune::merge()

tests/unit/AbcParser/Domain/Core/TuneTest.php

@@ -188,19 +188,31 @@ class TuneTest extends \PHPUnit_Framework_TestCase
     {
         $targetTune = TuneAttributeArrayBuilder::create()
             ->addTitle('target')
+            ->appendMusic('|:BAG BAG|')
             ->getTune();
 
         $sourceTune = TuneAttributeArrayBuilder::create()
             ->addTitle('source')
+            ->appendMusic('|:GAB GAB|')
+            ->addAuthor('a.non')
+            ->addComposer('composer')
+            ->addHistory('some story')
             ->getTune();
 
         $expected = TuneAttributeArrayBuilder::create()
             ->addTitle('target')
             ->addTitle('source')
+            ->appendMusic('|:BAG BAG|')
+            ->handleEndOfMusic()
+            ->appendMusic('|:GAB GAB|')
+            ->addAuthor('a.non')
+            ->addComposer('composer')
+            ->addHistory('some story')
             ->getTune($targetTune->identity());
 
         $result = $targetTune->merge($sourceTune);
 
         $this->assertEquals($expected, $result);
+
     }
 }