tests and eurc

tests/ShouldParseEurcChains/main.cpp

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+/*
+catcrafts.net
+Copyright (C) 2026 Catcrafts
+
+The source code of this website is made available for viewing purposes only.
+No permission is granted to copy, modify, distribute, or create derivative works.
+*/
+
+// The EURC rail's two parsers.
+//
+// The balance decoder is the line between "the buyer paid" and "the node
+// errored", and the chains parser is the line between "watching a chain"
+// and "silently not watching it". Both refuse rather than guess.
+
+import std;
+import Catcrafts.Shared;
+import Catcrafts.Server;
+
+using namespace Catcrafts;
+
+namespace {
+
+int failures = 0;
+
+void Check(bool ok, std::string_view what, std::string_view got = {}) {
+    if (ok) return;
+    ++failures;
+    std::println(std::cerr, "FAIL: {}{}{}", what,
+                 got.empty() ? "" : "  got: ", got);
+}
+
+} // namespace
+
+int main() {
+    using Server::ParseEthCallUint;
+    Check(ParseEthCallUint(R"({"jsonrpc":"2.0","id":1,"result":"0x0"})") == 0,
+          "eurc: zero balance");
+    Check(ParseEthCallUint(
+              R"({"jsonrpc":"2.0","id":1,"result":"0x0000000000000000000000000000000000000000000000000000000022001230"})")
+              == 570430000,
+          "eurc: €570.43 as 6-decimal base units, full 32-byte word");
+    Check(ParseEthCallUint(R"({"result":"0xFF"})") == 255,
+          "eurc: uppercase hex accepted");
+    // 2^63 does not fit; the decoder must saturate, never wrap to negative.
+    Check(ParseEthCallUint(R"({"result":"0x8000000000000000"})")
+              == std::numeric_limits<std::int64_t>::max(),
+          "eurc: overflow saturates");
+    Check(!ParseEthCallUint(
+              R"({"jsonrpc":"2.0","id":1,"error":{"code":-32000,"message":"x"}})")
+               .has_value(),
+          "eurc: an RPC error is not a zero balance");
+    Check(!ParseEthCallUint(R"({"result":"21ff361c"})").has_value(),
+          "eurc: missing 0x rejected");
+    Check(!ParseEthCallUint(R"({"result":"0x"})").has_value(),
+          "eurc: empty word rejected");
+    Check(!ParseEthCallUint(R"({"result":42})").has_value(),
+          "eurc: numeric result rejected — the wire type is a hex string");
+    Check(!ParseEthCallUint("garbage").has_value(), "eurc: malformed payload");
+
+    const auto chains = Server::ParseEurcChains(R"({"chains":[
+        {"name":"base","rpc":"https://mainnet.base.org",
+         "contract":"0x60a3E35Cc302bFA44Cb288Bc5a4F316Fdb1adb42",
+         "chain_id":8453,"note":"lowest fees"},
+        {"name":"ethereum","rpc":"https://ethereum-rpc.publicnode.com",
+         "contract":"0x1aBaEA1f7C830bD89Acc67eC4af516284b1bC33c","chain_id":1}]})");
+    Check(chains.has_value() && chains->size() == 2, "eurc: chains file parses");
+    if (chains && chains->size() == 2) {
+        Check((*chains)[0].name == "base" && (*chains)[0].chainId == 8453,
+              "eurc: file order preserved — first entry is the recommendation");
+        Check((*chains)[0].contract == "0x60a3e35cc302bfa44cb288bc5a4f316fdb1adb42",
+              "eurc: contract lowercased for comparison");
+        Check((*chains)[0].note == "lowest fees", "eurc: note carried");
+        Check((*chains)[1].blockTag == "finalized" && (*chains)[1].decimals == 6,
+              "eurc: defaults");
+    }
+    Check(!Server::ParseEurcChains(R"({"chains":[
+        {"name":"base","rpc":"https://x.org","contract":"0xdeadbeef"}]})").has_value(),
+          "eurc: short contract rejects the whole file");
+    Check(!Server::ParseEurcChains(R"({"chains":[
+        {"name":"base","rpc":"ftp://x.org",
+         "contract":"0x60a3E35Cc302bFA44Cb288Bc5a4F316Fdb1adb42"}]})").has_value(),
+          "eurc: non-http rpc rejects the whole file");
+    Check(!Server::ParseEurcChains(R"({"chains":[]})").has_value(),
+          "eurc: empty chain list rejected");
+    Check(!Server::ParseEurcChains("garbage").has_value(),
+          "eurc: malformed chains file rejected");
+
+    if (failures != 0) {
+        std::println(std::cerr, "{} check(s) failed", failures);
+        return 1;
+    }
+    return 0;
+}