fix: not forward admin API (#1629)

To merge to 2.2.3 branch.
It is different from the #1628 . I think this branch still forward
feature API to rippled.

tests/unit/rpc/RPCHelpersTests.cpp

@@ -24,6 +24,7 @@
 #include "rpc/common/Types.hpp"
 #include "util/Fixtures.hpp"
 #include "util/MockPrometheus.hpp"
+#include "util/NameGenerator.hpp"
 #include "util/TestObject.hpp"
 
 #include <boost/asio/impl/spawn.hpp>
@@ -538,3 +539,41 @@ TEST_F(RPCHelpersTest, ParseIssue)
         std::runtime_error
     );
 }
+
+struct IsAdminCmdParamTestCaseBundle {
+    std::string testName;
+    std::string method;
+    std::string testJson;
+    bool expected;
+};
+
+struct IsAdminCmdParameterTest : public TestWithParam<IsAdminCmdParamTestCaseBundle> {};
+
+static auto
+generateTestValuesForParametersTest()
+{
+    return std::vector<IsAdminCmdParamTestCaseBundle>{
+        {"featureVetoedTrue", "feature", R"({"vetoed": true, "feature": "foo"})", true},
+        {"featureVetoedFalse", "feature", R"({"vetoed": false, "feature": "foo"})", true},
+        {"ledgerFullTrue", "ledger", R"({"full": true})", true},
+        {"ledgerAccountsTrue", "ledger", R"({"accounts": true})", true},
+        {"ledgerTypeTrue", "ledger", R"({"type": true})", true},
+        {"ledgerFullFalse", "ledger", R"({"full": false})", false},
+        {"ledgerAccountsFalse", "ledger", R"({"accounts": false})", false},
+        {"ledgerTypeFalse", "ledger", R"({"type": false})", false},
+        {"ledgerEntry", "ledger_entry", R"({"type": false})", false}
+    };
+}
+
+INSTANTIATE_TEST_CASE_P(
+    IsAdminCmdTest,
+    IsAdminCmdParameterTest,
+    ValuesIn(generateTestValuesForParametersTest()),
+    tests::util::NameGenerator
+);
+
+TEST_P(IsAdminCmdParameterTest, Test)
+{
+    auto const testBundle = GetParam();
+    EXPECT_EQ(isAdminCmd(testBundle.method, boost::json::parse(testBundle.testJson).as_object()), testBundle.expected);
+}