Add ping handler (#503)

Fix #506

unittests/rpc/handlers/DefaultProcessorTests.cpp

@@ -52,6 +52,19 @@ TEST_F(RPCDefaultProcessorTest, ValidInput)
     ASSERT_TRUE(ret);  // no error
 }
 
+TEST_F(RPCDefaultProcessorTest, NoInputVaildCall)
+{
+    HandlerWithoutInputMock handler;
+    RPCng::detail::DefaultProcessor<HandlerWithoutInputMock> processor;
+
+    auto const data = InOutFake{"works"};
+    auto const input = json::parse(R"({})");
+    EXPECT_CALL(handler, process()).WillOnce(Return(data));
+
+    auto const ret = processor(handler, input);
+    ASSERT_TRUE(ret);  // no error
+}
+
 TEST_F(RPCDefaultProcessorTest, InvalidInput)
 {
     HandlerMock handler;

unittests/rpc/handlers/PingTest.cpp

@@ -0,0 +1,37 @@
+//------------------------------------------------------------------------------
+/*
+    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 <rpc/common/AnyHandler.h>
+#include <rpc/ngHandlers/Ping.h>
+#include <util/Fixtures.h>
+
+using namespace RPCng;
+
+class RPCHandlerTest : public NoLoggerFixture
+{
+};
+
+// example handler tests
+TEST_F(RPCHandlerTest, Ping)
+{
+    auto const handler = AnyHandler{PingHandler{}};
+    auto const output = handler.process(boost::json::parse(R"({})"));
+    ASSERT_TRUE(output);
+    EXPECT_EQ(output.value(), boost::json::parse(R"({})"));
+}

unittests/rpc/handlers/TestHandlerTests.cpp

@@ -50,6 +50,16 @@ TEST_F(RPCTestHandlerTest, HandlerSuccess)
     EXPECT_EQ(val.as_object().at("computed").as_string(), "world_10");
 }
 
+TEST_F(RPCTestHandlerTest, NoInputHandlerSuccess)
+{
+    auto const handler = AnyHandler{NoInputHandlerFake{}};
+    auto const output = handler.process(json::parse(R"({})"));
+    ASSERT_TRUE(output);
+
+    auto const val = output.value();
+    EXPECT_EQ(val.as_object().at("computed").as_string(), "test");
+}
+
 TEST_F(RPCTestHandlerTest, HandlerErrorHandling)
 {
     auto const handler = AnyHandler{HandlerFake{}};

unittests/rpc/handlers/impl/FakesAndMocks.h

@@ -98,6 +98,19 @@ public:
     }
 };
 
+class NoInputHandlerFake
+{
+public:
+    using Output = TestOutput;
+    using Result = RPCng::HandlerReturnType<Output>;
+
+    Result
+    process() const
+    {
+        return Output{"test"};
+    }
+};
+
 // example handler that returns custom error
 class FailingHandlerFake
 {
@@ -165,4 +178,12 @@ struct HandlerMock
     MOCK_METHOD(Result, process, (Input), (const));
 };
 
+struct HandlerWithoutInputMock
+{
+    using Output = InOutFake;
+    using Result = RPCng::HandlerReturnType<Output>;
+
+    MOCK_METHOD(Result, process, (), (const));
+};
+
 }  // namespace unittests::detail