diff --git a/tests/ChainingHashMap.cc b/tests/ChainingHashMap.cc
index 769e7fb..108c81c 100644
--- a/tests/ChainingHashMap.cc
+++ b/tests/ChainingHashMap.cc
@@ -88,4 +88,17 @@ TEST(ChainingHashMap, Resize)
     map[7] = 70;
     map[8] = 80;
     EXPECT_EQ(map.getBucketCount(), 16);
+}
+
+// Test for existence of key
+TEST(ChainingHashMap, ExistenceOfKey)
+{
+    benn::ChainingHashMap<int, int> map;
+
+    EXPECT_EQ(map.count(0), 0);
+    map[0] = 10;
+
+    EXPECT_EQ(map.count(0), 1);
+    EXPECT_EQ(map.count(1), 0);
+    EXPECT_EQ(map.count(10), 0);
 }
\ No newline at end of file
diff --git a/tests/OpenAddressingHashMap.cc b/tests/OpenAddressingHashMap.cc
index 57b69a9..03abccf 100644
--- a/tests/OpenAddressingHashMap.cc
+++ b/tests/OpenAddressingHashMap.cc
@@ -88,4 +88,17 @@ TEST(OpenAddressingHashMap, Resize)
     map[7] = 70;
     map[8] = 80;
     EXPECT_EQ(map.getBucketCount(), 16);
+}
+
+// Test for existence of key
+TEST(OpenAddressingHashMap, ExistenceOfKey)
+{
+    benn::OpenAddressingHashMap<int, int> map;
+
+    EXPECT_EQ(map.count(0), 0);
+    map[0] = 10;
+
+    EXPECT_EQ(map.count(0), 1);
+    EXPECT_EQ(map.count(1), 0);
+    EXPECT_EQ(map.count(10), 0);
 }
\ No newline at end of file