From b55432448e1f590387e02a8486e4fe515f8706c9 Mon Sep 17 00:00:00 2001
From: laentropia <aadrian887mh@gmail.com>
Date: Thu, 16 Apr 2026 20:56:48 -0600
Subject: [PATCH] test: added test for push_front

---
 src/arraylist.c       |  4 +--
 test/test_arraylist.c | 64 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+), 2 deletions(-)

diff --git a/src/arraylist.c b/src/arraylist.c
index 7b0f41f..a362266 100644
--- a/src/arraylist.c
+++ b/src/arraylist.c
@@ -162,9 +162,9 @@ ArrayListErr arraylist_push_front(ArrayList *arr, void *data) {
 
     // No problem if array is full because  it grows if it's full
     memmove(
-        arr->buffer,
         arr->buffer + arr->elem_size,
-        (arr->len - 1) * arr->elem_size
+        arr->buffer,
+        (arr->len) * arr->elem_size
     );
 
     memcpy(
diff --git a/test/test_arraylist.c b/test/test_arraylist.c
index 3e9851c..6b62391 100644
--- a/test/test_arraylist.c
+++ b/test/test_arraylist.c
@@ -254,6 +254,62 @@ static void test_push_back_null_data(void **state) {
     arraylist_destroy(&arr);
 }
 
+static void test_push_front_single_element(void **state) {
+    (void) state;
+
+    ArrayList *arr = arraylist_init(64, sizeof(int));
+    assert_non_null(arr);
+
+    int n = 8;
+    int m;
+    assert_uint_equal(arraylist_push_front(arr, &n), ARRLIST_OK);
+    assert_uint_equal(arraylist_size(arr), 1);
+    assert_uint_equal(arraylist_get(arr, 0, &m), ARRLIST_OK);
+    assert_uint_equal(m, 8);
+
+    arraylist_destroy(&arr);
+}
+
+static void test_push_front_multiple_elements(void **state) {
+    (void) state;
+
+    ArrayList *arr = arraylist_init(64, sizeof(int));
+    assert_non_null(arr);
+
+    int n = 8;
+    int m;
+
+    for (size_t i = 0; i < 10; i++) {
+        assert_uint_equal(arraylist_push_front(arr, &n), ARRLIST_OK);
+        assert_uint_equal(arraylist_size(arr), i + 1);
+        assert_uint_equal(arraylist_get(arr, 0, &m), ARRLIST_OK);
+        assert_uint_equal(m, n);
+        n++;
+    }
+
+    arraylist_destroy(&arr);
+}
+
+static void test_push_front_null_array(void **state) {
+    (void) state;
+
+    ArrayList *arr = NULL;
+
+    int n = 8;
+    assert_int_equal(arraylist_push_front(arr, &n), ARRLIST_NULL_ARG);
+}
+
+static void test_push_front_null_data(void **state) {
+    (void) state;
+
+    ArrayList *arr = arraylist_init(64, sizeof(int));
+    assert_non_null(arr);
+
+    assert_int_equal(arraylist_push_front(arr, NULL), ARRLIST_NULL_ARG);
+
+    arraylist_destroy(&arr);
+}
+
 int main(void) {
     const struct CMUnitTest init[] = {
         cmocka_unit_test(test_init_valid_parameters),
@@ -284,12 +340,20 @@ int main(void) {
         cmocka_unit_test(test_push_back_null_data),
     };
 
+    const struct CMUnitTest push_front[] = {
+        cmocka_unit_test(test_push_front_single_element),
+        cmocka_unit_test(test_push_front_multiple_elements),
+        cmocka_unit_test(test_push_front_null_array),
+        cmocka_unit_test(test_push_front_null_data),
+    };
+
     int rc = 0;
 
     rc += cmocka_run_group_tests(init, NULL, NULL);
     rc += cmocka_run_group_tests(destroy, NULL, NULL);
     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);
 
     return rc;
 }