diff --git a/ecs_tests.cpp b/ecs_tests.cpp
index ad3184e..b3be859 100644
--- a/ecs_tests.cpp
+++ b/ecs_tests.cpp
@@ -71,6 +71,7 @@ TEST_CASE("detail") {
             REQUIRE(s.has(42u));
             REQUIRE_FALSE(s.has(84u));
 
+            REQUIRE(s.find(42u) == s.begin());
             REQUIRE(s.find_index(42u).second);
             REQUIRE(s.find_index(42u).first == 0u);
             REQUIRE(s.get_index(42u) == 0u);
@@ -231,6 +232,14 @@ TEST_CASE("registry") {
             REQUIRE_FALSE(w.destroy_entity(e1));
             REQUIRE_FALSE(w.destroy_entity(e2));
         }
+        {
+            ecs::registry w;
+
+            const auto e1 = w.create_entity();
+            w.destroy_entity(e1);
+            const auto e2 = w.create_entity();
+            REQUIRE(e1 == e2);
+        }
     }
     SECTION("component_assigning") {
         {
@@ -355,6 +364,14 @@ TEST_CASE("registry") {
                 REQUIRE_FALSE(ww.find_component<velocity_c>(e2));
             }
         }
+        {
+            ecs::registry w;
+            auto e1 = w.create_entity();
+            e1.assign_component<position_c>(1, 2);
+            e1.assign_component<position_c>(3, 4);
+            REQUIRE(e1.get_component<position_c>().x == 3);
+            REQUIRE(e1.get_component<position_c>().y == 4);
+        }
         {
             ecs::registry w;