refactor: move indexable test files to separate folder

test/resources/indexable/Article.3.json

@@ -0,0 +1,36 @@
+{
+  "errorNames": [],
+  "instance": {
+    "type": "article",
+    "uid": "d541eda5-1542-59b2-969e-7dbbee0bd2a8",
+    "name": "Mozart und Frankfurt am Main : drei Generationen Mozart in Frankfurt am Main",
+    "description": "Ill.",
+    "categories": [
+      "article"
+    ],
+    "authors": [
+      {
+        "type": "person",
+        "uid": "56d46c9b-8ede-52ae-a40f-6800cff577e5",
+        "name": "Greve, Clemens"
+      }
+    ],
+    "firstPublished": "2008",
+    "sameAs": "https://hds2test.hebis.de/ubffm/Record/HEB198305427",
+    "origin": {
+      "indexed": "2018-09-11T12:30:00Z",
+      "name": "HeBIS HDS",
+      "originalId": "HEB198305427",
+      "type": "remote",
+      "url": "https://hds2test.hebis.de/ubffm/"
+    },
+    "isPartOf": {
+      "uid": "bc5e5399-a24c-5c01-9c1b-0c8b83272087",
+      "name": "Archiv für Frankfurts Geschichte und Kunst",
+      "type": "periodical",
+      "categories": []
+    },
+    "reference": "Band 71 (2008), Seite 27-40"
+  },
+  "schema": "SCArticle"
+}