domain/participant: add three way comparison operator

1 files changed, 30 insertions, 0 deletions

diff --git a/domain/tests/participant.cpp b/domain/tests/participant.cpp
index b7429aa..ee8af74 100644
--- a/domain/tests/participant.cpp
+++ b/domain/tests/participant.cpp
@@ -1,8 +1,11 @@
 #include "turns/domain/participant.hpp"
 
 #include <catch2/catch_test_macros.hpp>
+
 #include <glibmm/init.h>
 
+#include <compare>
+
 namespace turns::domain::tests
 {
 
@@ -38,6 +41,33 @@ namespace turns::domain::tests
       instance->order(8);
       REQUIRE(instance->order() == 8);
     }
+
+    SECTION("can be compared with another participant")
+    {
+      auto equivalent_instance = participant::create("Equivalent", constructed_order);
+      auto lesser_instance = participant::create("Lesser", constructed_order - 1);
+      auto greater_instance = participant::create("Greater", constructed_order + 1);
+
+      SECTION("yielding std::partial_ordering::equivalent for itself")
+      {
+        REQUIRE((instance <=> equivalent_instance) == std::partial_ordering::equivalent);
+      }
+
+      SECTION("yielding std::partial_ordering::equivalent for an equivalent participant")
+      {
+        REQUIRE((instance <=> equivalent_instance) == std::partial_ordering::equivalent);
+      }
+
+      SECTION("yielding std::partial_ordering::greater for a lesser participant")
+      {
+        REQUIRE((instance <=> lesser_instance) == std::partial_ordering::greater);
+      }
+
+      SECTION("yielding std::partial_ordering::less for a greater participant")
+      {
+        REQUIRE((instance <=> greater_instance) == std::partial_ordering::less);
+      }
+    }
   }
 
 }  // namespace turns::domain::tests
\ No newline at end of file