diff --git a/test/unit/small_map.cpp b/test/unit/small_map.cpp
index 7f6f003..3657685 100644
--- a/test/unit/small_map.cpp
+++ b/test/unit/small_map.cpp
@@ -342,6 +342,7 @@ TEST_CASE("Small Map") {
                 { 3, 3 },
                 { 4, 4 }
         }));
+        REQUIRE(a.count(4) == 1);
 
         // NOLINTNEXTLINE(performance-move-const-arg)
         auto p = std::make_pair(5, 5);
@@ -360,6 +361,7 @@ TEST_CASE("Small Map") {
                 { 4, 4 },
                 { 5, 5 }
         }));
+        REQUIRE(a.count(5) == 1);
 
         REQUIRE(a.erase(5) == 1);
         REQUIRE(a.size() == 4);
@@ -374,6 +376,7 @@ TEST_CASE("Small Map") {
                 { 3, 3 },
                 { 4, 4 }
         }));
+        REQUIRE(a.count(5) == 0);
 
         a.emplace(5, 5);
         REQUIRE(a.back().first == 5);
@@ -390,6 +393,7 @@ TEST_CASE("Small Map") {
                 { 4, 4 },
                 { 5, 5 }
         }));
+        REQUIRE(a.count(5) == 1);
 
         a.erase(std::prev(a.end()));
         REQUIRE(a.size() == 4);
@@ -421,6 +425,7 @@ TEST_CASE("Small Map") {
                 {  4,  4 },
                 { 10, 10 }
         }));
+        REQUIRE(a.count(10) == 1);
 
         REQUIRE(a.erase(10) == 1);
         REQUIRE(a.erase(4) == 1);
@@ -435,6 +440,7 @@ TEST_CASE("Small Map") {
                 { 2, 2 },
                 { 3, 3 }
         }));
+        REQUIRE(a.count(10) == 0);
 
         std::initializer_list<std::pair<const int, int>> src = {
             { 6, 6 },
@@ -1535,6 +1541,7 @@ TEST_CASE("Small Multi Map") {
                 { 3, 3 },
                 { 4, 4 }
         }));
+        REQUIRE(a.count(4) == 1);
 
         // NOLINTNEXTLINE(performance-move-const-arg)
         auto p = std::make_pair(5, 5);
@@ -1553,6 +1560,7 @@ TEST_CASE("Small Multi Map") {
                 { 4, 4 },
                 { 5, 5 }
         }));
+        REQUIRE(a.count(5) == 1);
 
         REQUIRE(a.erase(5) == 1);
         REQUIRE(a.size() == 4);
@@ -1567,6 +1575,7 @@ TEST_CASE("Small Multi Map") {
                 { 3, 3 },
                 { 4, 4 }
         }));
+        REQUIRE(a.count(5) == 0);
 
         a.emplace(5, 5);
         REQUIRE(a.back().first == 5);
@@ -1583,6 +1592,7 @@ TEST_CASE("Small Multi Map") {
                 { 4, 4 },
                 { 5, 5 }
         }));
+        REQUIRE(a.count(5) == 1);
 
         a.erase(std::prev(a.end()));
         REQUIRE(a.size() == 4);
@@ -1614,6 +1624,7 @@ TEST_CASE("Small Multi Map") {
                 {  4,  4 },
                 { 10, 10 }
         }));
+        REQUIRE(a.count(10) == 1);
 
         REQUIRE(a.erase(10) == 1);
         REQUIRE(a.erase(4) == 1);
@@ -1628,6 +1639,7 @@ TEST_CASE("Small Multi Map") {
                 { 2, 2 },
                 { 3, 3 }
         }));
+        REQUIRE(a.count(10) == 0);
 
         std::initializer_list<std::pair<const int, int>> src = {
             { 6, 6 },
@@ -1687,6 +1699,7 @@ TEST_CASE("Small Multi Map") {
                 { 7, 7 },
                 { 7, 8 }
         }));
+        REQUIRE(a.count(7) == 2);
 
         it = a.erase(a.begin() + 1);
         REQUIRE(it == a.begin() + 1);
@@ -1731,6 +1744,7 @@ TEST_CASE("Small Multi Map") {
                 { 1, 1 },
                 { 6, 6 }
         }));
+        REQUIRE(a.count(7) == 0);
 
         a.clear();
         // NOLINTNEXTLINE(readability-container-size-empty)
diff --git a/test/unit/small_set.cpp b/test/unit/small_set.cpp
index c5e3d34..cff29f9 100644
--- a/test/unit/small_set.cpp
+++ b/test/unit/small_set.cpp
@@ -236,6 +236,7 @@ TEST_CASE("Small Set") {
         REQUIRE(a.capacity() == 5);
         REQUIRE_FALSE(a.empty());
         REQUIRE(equal_il(a, { 1, 2, 3, 4 }));
+        REQUIRE(a.count(4) == 1);
 
         // NOLINTNEXTLINE(performance-move-const-arg)
         int p = 5;
@@ -246,6 +247,7 @@ TEST_CASE("Small Set") {
         REQUIRE(a.capacity() == 5);
         REQUIRE_FALSE(a.empty());
         REQUIRE(equal_il(a, { 1, 2, 3, 4, 5 }));
+        REQUIRE(a.count(5) == 1);
 
         REQUIRE(a.erase(5) == 1);
         REQUIRE(a.size() == 4);
@@ -253,6 +255,7 @@ TEST_CASE("Small Set") {
         REQUIRE(a.capacity() == 5);
         REQUIRE_FALSE(a.empty());
         REQUIRE(equal_il(a, { 1, 2, 3, 4 }));
+        REQUIRE(a.count(5) == 0);
 
         a.emplace(5);
         REQUIRE(a.back() == 5);
@@ -261,6 +264,7 @@ TEST_CASE("Small Set") {
         REQUIRE(a.capacity() == 5);
         REQUIRE_FALSE(a.empty());
         REQUIRE(equal_il(a, { 1, 2, 3, 4, 5 }));
+        REQUIRE(a.count(5) == 1);
 
         a.erase(std::prev(a.end()));
         REQUIRE(a.size() == 4);
@@ -277,6 +281,7 @@ TEST_CASE("Small Set") {
         REQUIRE(a.capacity() == 5);
         REQUIRE_FALSE(a.empty());
         REQUIRE(equal_il(a, { 1, 2, 3, 4, 10 }));
+        REQUIRE(a.count(10) == 1);
 
         REQUIRE(a.erase(10) == 1);
         REQUIRE(a.erase(4) == 1);
@@ -285,6 +290,7 @@ TEST_CASE("Small Set") {
         REQUIRE(a.capacity() == 5);
         REQUIRE_FALSE(a.empty());
         REQUIRE(equal_il(a, { 1, 2, 3 }));
+        REQUIRE(a.count(10) == 0);
 
         std::initializer_list<int> src = { 6, 5, 7 };
         a.insert(src.begin(), src.end());
@@ -887,6 +893,7 @@ TEST_CASE("Small Multi Set") {
         REQUIRE(a.capacity() == 5);
         REQUIRE_FALSE(a.empty());
         REQUIRE(equal_il(a, { 1, 2, 3, 4, 4 }));
+        REQUIRE(a.count(4) == 2);
 
         // NOLINTNEXTLINE(performance-move-const-arg)
         int p = 5;
@@ -897,6 +904,7 @@ TEST_CASE("Small Multi Set") {
         REQUIRE(a.capacity() >= 6);
         REQUIRE_FALSE(a.empty());
         REQUIRE(equal_il(a, { 1, 2, 3, 4, 4, 5 }));
+        REQUIRE(a.count(5) == 1);
 
         REQUIRE(a.erase(5) == 1);
         REQUIRE(a.size() == 5);
@@ -904,6 +912,7 @@ TEST_CASE("Small Multi Set") {
         REQUIRE(a.capacity() >= 5);
         REQUIRE_FALSE(a.empty());
         REQUIRE(equal_il(a, { 1, 2, 3, 4, 4 }));
+        REQUIRE(a.count(5) == 0);
 
         a.emplace(5);
         REQUIRE(a.back() == 5);
@@ -912,6 +921,7 @@ TEST_CASE("Small Multi Set") {
         REQUIRE(a.capacity() >= 6);
         REQUIRE_FALSE(a.empty());
         REQUIRE(equal_il(a, { 1, 2, 3, 4, 4, 5 }));
+        REQUIRE(a.count(5) == 1);
 
         a.erase(std::prev(a.end()));
         REQUIRE(a.size() == 5);
@@ -928,6 +938,7 @@ TEST_CASE("Small Multi Set") {
         REQUIRE(a.capacity() >= 6);
         REQUIRE_FALSE(a.empty());
         REQUIRE(equal_il(a, { 1, 2, 3, 4, 4, 10 }));
+        REQUIRE(a.count(10) == 1);
 
         REQUIRE(a.erase(10) == 1);
         REQUIRE(a.erase(4) == 2);
@@ -936,6 +947,7 @@ TEST_CASE("Small Multi Set") {
         REQUIRE(a.capacity() >= 5);
         REQUIRE_FALSE(a.empty());
         REQUIRE(equal_il(a, { 1, 2, 3 }));
+        REQUIRE(a.count(4) == 0);
 
         std::initializer_list<int> src = { 6, 5, 7 };
         a.insert(src.begin(), src.end());