add json schema tests to token controller

apps/block_scout_web/test/block_scout_web/controllers/api/rpc/token_controller_test.exs

@@ -84,4 +84,26 @@ defmodule BlockScoutWeb.API.RPC.TokenControllerTest do
       assert response["message"] == "OK"
     end
   end
+
+  defp gettoken_schema do
+    ExJsonSchema.Schema.resolve(%{
+      "type" => "object",
+      "properties" => %{
+        "message" => %{"type" => "string"},
+        "status" => %{"type" => "string"},
+        "result" => %{
+          "type" => "object",
+          "properties" => %{
+            "name" => %{"type" => "string"},
+            "symbol" => %{"type" => "string"},
+            "totalSupply" => %{"type" => "string"},
+            "decimals" => %{"type" => "string"},
+            "type" => %{"type" => "string"},
+            "cataloged" => %{"type" => "string"},
+            "contractAddress" => %{"type" => "string"}
+          }
+        }
+      }
+    })
+  end
 end