Implement flexible fake backend

Change-Id: Icff0d3b8e1a82c7e459dfac6417f59502f0eb099
diff --git a/t/fixtures/response_orthdas.json b/t/fixtures/response_orthdas.json
new file mode 100644
index 0000000..b578412
--- /dev/null
+++ b/t/fixtures/response_orthdas.json
@@ -0,0 +1,11 @@
+{
+  "comment" : "q=[orth=das",
+  "status" : 400,
+  "json" : {
+    "@context" : "http://korap.ids-mannheim.de/ns/koral/0.3/context.jsonld",
+    "errors" : [
+      [302,"Parantheses/brackets unbalanced.",0],
+      [302,"Could not parse query >>> [orth=das <<<."]
+    ]
+  }
+}