diff -r bb17790af41e -r fd3368c20413 test/test_map.cpp
--- a/test/test_map.cpp	Fri May 27 14:14:55 2022 +0200
+++ b/test/test_map.cpp	Fri May 27 17:40:27 2022 +0200
@@ -200,3 +200,52 @@
     cxMapDestroy(map);
     EXPECT_TRUE(allocator.verify());
 }
+
+TEST(CxHashMap, RehashNotRequired) {
+    CxTestingAllocator allocator;
+    auto map = cxHashMapCreate(&allocator, 8);
+
+    cxMapPut(map, cxMapKeyStr("key 1"), (void *) "val 1");
+    cxMapPut(map, cxMapKeyStr("key 2"), (void *) "val 2");
+    cxMapPut(map, cxMapKeyStr("key 3"), (void *) "val 3");
+    cxMapPut(map, cxMapKeyStr("key 4"), (void *) "val 4");
+    cxMapPut(map, cxMapKeyStr("key 5"), (void *) "val 5");
+    cxMapPut(map, cxMapKeyStr("key 6"), (void *) "val 6");
+
+    // 6/8 does not exceed 0.75, therefore the function should not rehash
+    int result = cxMapRehash(map);
+    EXPECT_EQ(result, 0);
+    EXPECT_EQ(reinterpret_cast<struct cx_hash_map_s *>(map)->bucket_count, 8);
+
+    cxMapDestroy(map);
+    EXPECT_TRUE(allocator.verify());
+}
+
+TEST(CxHashMap, Rehash) {
+    CxTestingAllocator allocator;
+    auto map = cxHashMapCreate(&allocator, 8);
+
+    cxMapPut(map, cxMapKeyStr("key 1"), (void *) "val 1");
+    cxMapPut(map, cxMapKeyStr("key 2"), (void *) "val 2");
+    cxMapPut(map, cxMapKeyStr("key 3"), (void *) "val 3");
+    cxMapPut(map, cxMapKeyStr("key 4"), (void *) "val 4");
+    cxMapPut(map, cxMapKeyStr("key 5"), (void *) "val 5");
+    cxMapPut(map, cxMapKeyStr("key 6"), (void *) "val 6");
+    cxMapPut(map, cxMapKeyStr("key 7"), (void *) "val 7");
+
+    int result = cxMapRehash(map);
+    EXPECT_EQ(result, 0);
+    EXPECT_EQ(reinterpret_cast<struct cx_hash_map_s *>(map)->bucket_count, 17);
+    EXPECT_EQ(map->size, 7);
+
+    EXPECT_EQ(strcmp((char *) cxMapGet(map, cxMapKeyStr("key 1")), "val 1"), 0);
+    EXPECT_EQ(strcmp((char *) cxMapGet(map, cxMapKeyStr("key 2")), "val 2"), 0);
+    EXPECT_EQ(strcmp((char *) cxMapGet(map, cxMapKeyStr("key 3")), "val 3"), 0);
+    EXPECT_EQ(strcmp((char *) cxMapGet(map, cxMapKeyStr("key 4")), "val 4"), 0);
+    EXPECT_EQ(strcmp((char *) cxMapGet(map, cxMapKeyStr("key 5")), "val 5"), 0);
+    EXPECT_EQ(strcmp((char *) cxMapGet(map, cxMapKeyStr("key 6")), "val 6"), 0);
+    EXPECT_EQ(strcmp((char *) cxMapGet(map, cxMapKeyStr("key 7")), "val 7"), 0);
+
+    cxMapDestroy(map);
+    EXPECT_TRUE(allocator.verify());
+}
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