added more tests

test/archethic/oracle_chain/services/uco_price_test.exs

@@ -42,6 +42,25 @@ defmodule Archethic.OracleChain.Services.UCOPriceTest do
     assert {:ok, %{"eur" => _, "usd" => _}} = UCOPrice.fetch()
   end
 
+  test "fetch/0 should retrieve some data and build a map with the oracle name in it and keep the precision to 5" do
+    MockUCOPriceProvider1
+    |> expect(:fetch, fn pairs ->
+      {:ok, %{"eur" => [0.123456789], "usd" => [0.123454789]}}
+    end)
+
+    MockUCOPriceProvider2
+    |> expect(:fetch, fn pairs ->
+      {:ok, %{"eur" => [0.123456789], "usd" => [0.123454789]}}
+    end)
+
+    MockUCOPriceProvider3
+    |> expect(:fetch, fn pairs ->
+      {:ok, %{"eur" => [0.123456789], "usd" => [0.123454789]}}
+    end)
+
+    assert {:ok, %{"eur" => 0.12346, "usd" => 0.12345}} = UCOPrice.fetch()
+  end
+
   describe "verify/1" do
     test "should return true if the prices are the good one" do
       MockUCOPriceProvider1