public function testMerge()
{
// Basic merge.
$tag1 = Tag::firstOrCreate(['name' => 'Tag 1']);
$tag2 = Tag::firstOrCreate(['name' => 'Tag 2']);
$this->assertSame(2, Tag::count());
$tag1->merge($tag2);
$this->assertSame(1, Tag::count());
$this->assertSame('Tag 1', Tag::first()->name);
// Merge when the other-tag has assets attached.
$tag3 = Tag::firstOrCreate(['name' => 'Tag 3']);
$asset = Asset::firstOrCreate(['identifier' => 'Asset 1']);
$asset->addTags('Tag 3');
$this->assertSame(2, Tag::count());
$tag1->merge($tag3);
$this->assertSame(1, Tag::count());
$this->assertSame(1, $tag1->assets->count());
$this->assertSame('Tag 1', $asset->tagsAsString());
// What about when a JobList is already tagged with both tags?
$type = new \App\Model\JobType();
$type->save();
$jobList = new JobList();
$jobList->name = 'JL1';
$jobList->type_id = $type->id;
$jobList->save();
$jobList->addTags('Tag 1, Tag 4, Tag 5');
$tag4 = Tag::firstOrCreate(['name' => 'Tag 4']);
$this->assertSame(3, Tag::count());
$tag1->merge($tag4);
$this->assertSame(2, Tag::count());
$this->assertSame('Tag 1, Tag 5', $jobList->tagsAsString());
}