Add helper to modify Env configs (RIPD-1247)

Add envconfig test helper for manipulating Env config via
callables. Create new common modifiers for non-admin config,
validator config and one for using different server port values.

src/test/jtx/impl/envconfig.cpp

@@ -0,0 +1,89 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of rippled: https://github.com/ripple/rippled
+    Copyright (c) 2012-2017 Ripple Labs Inc.
+
+    Permission to use, copy, modify, and/or 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 <test/jtx/envconfig.h>
+#include <test/jtx/Env.h>
+#include <ripple/core/ConfigSections.h>
+
+namespace ripple {
+namespace test {
+
+void
+setupConfigForUnitTests (Config& cfg)
+{
+    cfg.overwrite (ConfigSection::nodeDatabase (), "type", "memory");
+    cfg.overwrite (ConfigSection::nodeDatabase (), "path", "main");
+    cfg.deprecatedClearSection (ConfigSection::importNodeDatabase ());
+    cfg.legacy("database_path", "");
+    cfg.setupControl(true, true, true);
+    cfg["server"].append("port_peer");
+    cfg["port_peer"].set("ip", "127.0.0.1");
+    cfg["port_peer"].set("port", "8080");
+    cfg["port_peer"].set("protocol", "peer");
+    cfg["server"].append("port_rpc");
+    cfg["port_rpc"].set("ip", "127.0.0.1");
+    cfg["port_rpc"].set("port", "8081");
+    cfg["port_rpc"].set("protocol", "http,ws2");
+    cfg["port_rpc"].set("admin", "127.0.0.1");
+    cfg["server"].append("port_ws");
+    cfg["port_ws"].set("ip", "127.0.0.1");
+    cfg["port_ws"].set("port", "8082");
+    cfg["port_ws"].set("protocol", "ws");
+    cfg["port_ws"].set("admin", "127.0.0.1");
+}
+
+namespace jtx {
+
+std::unique_ptr<Config>
+no_admin(std::unique_ptr<Config> cfg)
+{
+    (*cfg)["port_rpc"].set("admin","");
+    (*cfg)["port_ws"].set("admin","");
+    return cfg;
+}
+
+auto constexpr defaultseed = "shUwVw52ofnCUX5m7kPTKzJdr4HEH";
+
+std::unique_ptr<Config>
+validator(std::unique_ptr<Config> cfg, std::string const& seed)
+{
+    // If the config has valid validation keys then we run as a validator.
+    cfg->section(SECTION_VALIDATION_SEED).append(
+        std::vector<std::string>{seed.empty() ? defaultseed : seed});
+    return cfg;
+}
+
+std::unique_ptr<Config>
+port_increment(std::unique_ptr<Config> cfg, int increment)
+{
+    for (auto const sectionName : {"port_peer", "port_rpc", "port_ws"})
+    {
+        Section& s = (*cfg)[sectionName];
+        auto const port = s.get<std::int32_t>("port");
+        if (port)
+        {
+            s.set ("port", std::to_string(*port + increment));
+        }
+    }
+    return cfg;
+}
+
+} // jtx
+} // test
+} // ripple