diff --git a/test/test_arraylist.c b/test/test_arraylist.c
index 6b62391..d2de6e8 100644
--- a/test/test_arraylist.c
+++ b/test/test_arraylist.c
@@ -310,6 +310,104 @@ static void test_push_front_null_data(void **state) {
     arraylist_destroy(&arr);
 }
 
+// Insert
+static void test_insert_at_beginning(void **state) {
+    (void) state;
+
+    ArrayList *arr = arraylist_init(64, sizeof(int));
+    assert_non_null(arr);
+
+    for (int i = 0; i < 10; i++) {
+        assert_uint_equal(arraylist_push_back(arr, &i), ARRLIST_OK);
+    }
+
+    int n = 8;
+    int m;
+    assert_uint_equal(arraylist_size(arr), 10);
+    assert_uint_equal(arraylist_insert(arr, 0, &n), ARRLIST_OK);
+    assert_uint_equal(arraylist_get(arr, 0, &m), ARRLIST_OK);
+    assert_uint_equal(arraylist_size(arr), 11);
+    assert_uint_equal(n, m);
+
+    arraylist_destroy(&arr);
+}
+
+static void test_insert_at_middle(void **state) {
+    (void) state;
+
+    ArrayList *arr = arraylist_init(64, sizeof(int));
+    assert_non_null(arr);
+
+    for (int i = 0; i < 10; i++) {
+        assert_uint_equal(arraylist_push_back(arr, &i), ARRLIST_OK);
+    }
+
+    int n = 8;
+    int m;
+    assert_uint_equal(arraylist_size(arr), 10);
+    assert_uint_equal(arraylist_insert(arr, 5, &n), ARRLIST_OK);
+    assert_uint_equal(arraylist_get(arr, 5, &m), ARRLIST_OK);
+    assert_uint_equal(arraylist_size(arr), 11);
+    assert_uint_equal(n, m);
+
+    arraylist_destroy(&arr);
+}
+
+static void test_insert_at_end(void **state) {
+    (void) state;
+
+    ArrayList *arr = arraylist_init(64, sizeof(int));
+    assert_non_null(arr);
+
+    for (int i = 0; i < 10; i++) {
+        assert_uint_equal(arraylist_push_back(arr, &i), ARRLIST_OK);
+    }
+
+    int n = 8;
+    int m;
+    assert_uint_equal(arraylist_size(arr), 10);
+    assert_uint_equal(arraylist_insert(arr, 10, &n), ARRLIST_OK);
+    assert_uint_equal(arraylist_get(arr, 10, &m), ARRLIST_OK);
+    assert_uint_equal(arraylist_size(arr), 11);
+    assert_uint_equal(n, m);
+
+    arraylist_destroy(&arr);
+}
+
+static void test_insert_at_invalid_index(void **state) {
+    (void) state;
+
+    ArrayList *arr = arraylist_init(64, sizeof(int));
+    assert_non_null(arr);
+
+
+    int n = 8;
+    assert_uint_equal(arraylist_insert(arr, 80, &n), ARRLIST_OUT_OF_BOUNDS);
+
+    arraylist_destroy(&arr);
+}
+
+static void test_insert_null_array(void **state) {
+    (void) state;
+
+    ArrayList *arr = NULL;
+
+    int n = 8;
+    assert_uint_equal(arraylist_insert(arr, 0, &n), ARRLIST_NULL_ARG);
+}
+
+static void test_insert_null_data(void **state) {
+    (void) state;
+
+    ArrayList *arr = arraylist_init(64, sizeof(int));
+    assert_non_null(arr);
+
+
+    assert_uint_equal(arraylist_insert(arr, 0, NULL), ARRLIST_NULL_ARG);
+
+    arraylist_destroy(&arr);
+}
+
 int main(void) {
     const struct CMUnitTest init[] = {
         cmocka_unit_test(test_init_valid_parameters),
@@ -347,6 +445,15 @@ int main(void) {
         cmocka_unit_test(test_push_front_null_data),
     };
 
+    const struct CMUnitTest insert[] = {
+        cmocka_unit_test(test_insert_at_beginning),
+        cmocka_unit_test(test_insert_at_middle),
+        cmocka_unit_test(test_insert_at_end),
+        cmocka_unit_test(test_insert_at_invalid_index),
+        cmocka_unit_test(test_insert_null_array),
+        cmocka_unit_test(test_insert_null_data),
+    };
+
     int rc = 0;
 
     rc += cmocka_run_group_tests(init, NULL, NULL);
@@ -354,6 +461,7 @@ int main(void) {
     rc += cmocka_run_group_tests(state, NULL, NULL);
     rc += cmocka_run_group_tests(push_back, NULL, NULL);
     rc += cmocka_run_group_tests(push_front, NULL, NULL);
+    rc += cmocka_run_group_tests(insert, NULL, NULL);
 
     return rc;
 }