Add artist test

tests/ArtistTest.php

@@ -0,0 +1,46 @@
+<?php
+
+use App\Models\Artist;
+use App\Models\User;
+use Illuminate\Foundation\Testing\DatabaseTransactions;
+
+class InteractionTest extends TestCase
+{
+    use DatabaseTransactions;
+
+    public function setUp()
+    {
+        parent::setUp();
+    }
+
+    public function testShouldBeCreatedWithUniqueNames()
+    {
+        $name = 'Foo Fighters';
+        $artist = Artist::get($name);
+
+        $this->assertEquals($name, $artist->name);
+
+        // Should be only 2 records: UNKNOWN_ARTIST, and our Dave Grohl's band
+        $this->assertEquals(2, Artist::all()->count());
+
+        Artist::get($name);
+
+        // Should still be 2.
+        $this->assertEquals(2, Artist::all()->count());
+    }
+
+    public function testArtistWithEmptyNameShouldBeUnknown()
+    {
+        $this->assertEquals(Artist::UNKNOWN_NAME, Artist::get('')->name);
+    }
+
+    public function testNameWithWeirdCharacters()
+    {
+        // Don't really think this is even necessary if the user has set a proper utf8 encoding
+        // for the database.
+        $name = '<27><>Ой°Ы&囧rz';
+        $artist = factory(Artist::class)->create(['name' => $name]);
+
+        $this->assertEquals($artist->id, Artist::get($name)->id);
+    }
+}