start on Tune::merge()

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

@@ -28,6 +28,22 @@ class TuneTest extends \PHPUnit_Framework_TestCase
         $this->assertInstanceOf(Tune::class, $tune);
     }
 
+    public function testCanIntializeFromArray()
+    {
+        $titles = ['Title'];
+        $authors = ['Richard Morgan'];
+
+        $config = [
+            'Titles' => $titles,
+            'Authors' => $authors
+        ];
+
+        $tune = new Tune($config);
+
+        $this->assertInstanceOf(Tune::class, $tune);
+        $this->assertEquals($tune->getTitles(), $titles);
+    }
+
     public function testNewTuneHasIdentitySet()
     {
         $params = [];
@@ -168,4 +184,20 @@ class TuneTest extends \PHPUnit_Framework_TestCase
         $this->assertNotEmpty($result);
         $this->assertEquals($setting, $result[0]);
     }
+
+    public function testMergeAddsExtraDataToTune()
+    {
+        $targetTune = new Tune([
+            'titles' => ['target']
+        ]);
+        $sourceTune = new Tune([
+            'titles' => ['source']
+        ]);
+
+        $result = $targetTune->merge($sourceTune);
+
+        $this->assertEquals(new Tune([
+            'titles' => ['target', 'source']
+        ]), $result);
+    }
 }