Add new RPC Handler "version" (#782)

Fixes #726

unittests/rpc/handlers/VersionHandlerTest.cpp

@@ -0,0 +1,66 @@
+//------------------------------------------------------------------------------
+/*
+    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/Fixtures.h>
+#include <util/TestObject.h>
+
+#include <rpc/common/AnyHandler.h>
+#include <rpc/handlers/VersionHandler.h>
+
+
+constexpr static auto DEFAULT_API_VERSION = 3u;
+constexpr static auto MIN_API_VERSION = 2u;
+constexpr static auto MAX_API_VERSION = 10u;
+
+using namespace RPC;
+namespace json = boost::json;
+
+class RPCVersionHandlerTest : public HandlerBaseTest
+{
+};
+
+TEST_F(RPCVersionHandlerTest, Default)
+{
+    clio::Config cfg{json::parse(fmt::format(
+        R"({{
+            "min": {},
+            "max": {},
+            "default": {}
+        }})",
+        MIN_API_VERSION,
+        MAX_API_VERSION,
+        DEFAULT_API_VERSION))};
+
+    runSpawn([&](auto& yield) {
+        auto const handler = AnyHandler{VersionHandler{cfg}};
+        auto const output = handler.process(static_cast<json::value>(cfg), Context{std::ref(yield)});
+        ASSERT_TRUE(output);
+
+        // check all against all the correct values
+        auto const& result = output.value().as_object();
+        EXPECT_TRUE(result.contains("version"));
+        auto const& info = result.at("version").as_object();
+        EXPECT_TRUE(info.contains("first"));
+        EXPECT_TRUE(info.contains("last"));
+        EXPECT_TRUE(info.contains("good"));
+        EXPECT_EQ(info.at("first"), 2u);
+        EXPECT_EQ(info.at("last"), 10u);
+        EXPECT_EQ(info.at("good"), 3u);
+    });
+}