Implement extractor tests (#671)

unittests/util/FakeFetchResponse.h

@@ -0,0 +1,55 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of clio: https://github.com/XRPLF/clio
+    Copyright (c) 2023, the clio developers.
+
+    Permission to use, copy, modify, and distribute this software for any
+    purpose with or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL,  DIRECT,  INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#pragma once
+
+#include <cstddef>
+
+class FakeTransactionsList
+{
+    std::size_t size_ = 0;
+
+public:
+    std::size_t
+    transactions_size()
+    {
+        return size_;
+    }
+};
+
+struct FakeFetchResponse
+{
+    uint32_t id;
+
+    FakeFetchResponse(uint32_t id = 0) : id{id}
+    {
+    }
+
+    bool
+    operator==(FakeFetchResponse const& other) const
+    {
+        return other.id == id;
+    }
+
+    FakeTransactionsList
+    transactions_list() const
+    {
+        return {};
+    }
+};