refactor: Create interface for DOSGuard (#1602)

For #919.

tests/unit/web/dosguard/IntervalSweepHandlerTests.cpp

@@ -0,0 +1,56 @@
+//------------------------------------------------------------------------------
+/*
+    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.
+*/
+//==============================================================================
+
+#include "util/AsioContextTestFixture.hpp"
+#include "util/config/Config.hpp"
+#include "web/dosguard/DOSGuardInterface.hpp"
+#include "web/dosguard/IntervalSweepHandler.hpp"
+
+#include <boost/json/parse.hpp>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include <chrono>
+
+using namespace web::dosguard;
+
+struct IntervalSweepHandlerTest : SyncAsioContextTest {
+protected:
+    constexpr static auto JSONData = R"JSON(
+    {
+        "dos_guard": {
+            "sweep_interval": 0
+        }
+    }
+)JSON";
+
+    struct DosGuardMock : BaseDOSGuard {
+        MOCK_METHOD(void, clear, (), (noexcept, override));
+    };
+    testing::StrictMock<DosGuardMock> guardMock;
+
+    util::Config cfg{boost::json::parse(JSONData)};
+    IntervalSweepHandler sweepHandler{cfg, ctx, guardMock};
+};
+
+TEST_F(IntervalSweepHandlerTest, SweepAfterInterval)
+{
+    EXPECT_CALL(guardMock, clear()).Times(testing::AtLeast(10));
+    runContextFor(std::chrono::milliseconds{20});
+}