crypto fix

tests/ShouldParseEurcChains/main.cpp

@@ -134,6 +134,77 @@ int main() {
               "eurc: a hex block number is still accepted");
     }
 
+    // ── corroboration: multiple endpoints per chain ──────────────────
+    {
+        // The single-"rpc" shorthand still parses, and lands as one endpoint
+        // with min_confirmations=1 (the pre-corroboration behaviour).
+        const auto one = Server::ParseEurcChains(R"({"chains":[
+            {"name":"base","rpc":"https://a.example",
+             "contract":"0x60a3E35Cc302bFA44Cb288Bc5a4F316Fdb1adb42"}]})");
+        Check(one.has_value() && (*one)[0].rpcUrls.size() == 1
+                  && (*one)[0].rpcUrls[0] == "https://a.example"
+                  && (*one)[0].minConfirmations == 1,
+              "eurc: the single-rpc shorthand still loads, one source, one confirmation");
+
+        // Two endpoints default to requiring agreement between both.
+        const auto two = Server::ParseEurcChains(R"({"chains":[
+            {"name":"base","rpcs":["https://a.example","https://b.example"],
+             "contract":"0x60a3E35Cc302bFA44Cb288Bc5a4F316Fdb1adb42"}]})");
+        Check(two.has_value() && (*two)[0].rpcUrls.size() == 2
+                  && (*two)[0].minConfirmations == 2,
+              "eurc: two endpoints default to two confirmations");
+
+        // Three endpoints still default to two — a quorum, not unanimity, so
+        // one node being down does not stop the shop settling.
+        const auto three = Server::ParseEurcChains(R"({"chains":[
+            {"name":"base","rpcs":["https://a.example","https://b.example",
+                                   "https://c.example"],
+             "contract":"0x60a3E35Cc302bFA44Cb288Bc5a4F316Fdb1adb42"}]})");
+        Check(three.has_value() && (*three)[0].minConfirmations == 2,
+              "eurc: three endpoints still need two agreeing, not all three");
+
+        // An explicit value is honoured.
+        const auto strict = Server::ParseEurcChains(R"({"chains":[
+            {"name":"base","rpcs":["https://a.example","https://b.example",
+                                   "https://c.example"],"min_confirmations":3,
+             "contract":"0x60a3E35Cc302bFA44Cb288Bc5a4F316Fdb1adb42"}]})");
+        Check(strict.has_value() && (*strict)[0].minConfirmations == 3,
+              "eurc: an explicit min_confirmations is honoured");
+    }
+
+    // One endpoint cannot corroborate itself, so a repeated URL is refused
+    // rather than counted twice toward the quorum.
+    Check(!Server::ParseEurcChains(R"({"chains":[
+        {"name":"base","rpcs":["https://a.example","https://a.example"],
+         "contract":"0x60a3E35Cc302bFA44Cb288Bc5a4F316Fdb1adb42"}]})").has_value(),
+          "eurc: the same endpoint listed twice is refused");
+
+    // Asking for more agreement than there are sources would never settle
+    // anything — a silent never-pays shop, so it is a refusal at load.
+    Check(!Server::ParseEurcChains(R"({"chains":[
+        {"name":"base","rpcs":["https://a.example","https://b.example"],
+         "min_confirmations":3,
+         "contract":"0x60a3E35Cc302bFA44Cb288Bc5a4F316Fdb1adb42"}]})").has_value(),
+          "eurc: more confirmations than endpoints is refused");
+    Check(!Server::ParseEurcChains(R"({"chains":[
+        {"name":"base","rpcs":["https://a.example"],"min_confirmations":0,
+         "contract":"0x60a3E35Cc302bFA44Cb288Bc5a4F316Fdb1adb42"}]})").has_value(),
+          "eurc: zero confirmations is refused");
+
+    // An empty rpcs list is not a chain that can be watched.
+    Check(!Server::ParseEurcChains(R"({"chains":[
+        {"name":"base","rpcs":[],
+         "contract":"0x60a3E35Cc302bFA44Cb288Bc5a4F316Fdb1adb42"}]})").has_value(),
+          "eurc: an empty endpoint list is refused");
+    Check(!Server::ParseEurcChains(R"({"chains":[
+        {"name":"base","rpcs":["https://a.example",42],
+         "contract":"0x60a3E35Cc302bFA44Cb288Bc5a4F316Fdb1adb42"}]})").has_value(),
+          "eurc: a non-string endpoint is refused");
+    Check(!Server::ParseEurcChains(R"({"chains":[
+        {"name":"base","rpcs":["https://a.example","ftp://b.example"],
+         "contract":"0x60a3E35Cc302bFA44Cb288Bc5a4F316Fdb1adb42"}]})").has_value(),
+          "eurc: a non-http endpoint anywhere in the list is refused");
+
     if (failures != 0) {
         std::println(std::cerr, "{} check(s) failed", failures);
         return 1;