diff --git a/test_numbers.c b/test_numbers.c
new file mode 100644
index 0000000..422f5d9
--- /dev/null
+++ b/test_numbers.c
@@ -0,0 +1,72 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "numbers.h"
+
+void test_empty_function(void)
+{
+    unsigned int len1 = 1;
+    unsigned int len2 = 5;
+    unsigned int *null_array = NULL;
+    unsigned int array[] = {1, 2, 3, 4, 5};
+    unsigned int *array_ptr = array;
+
+    unsigned int *create_num = createNumbers(len1);
+    if (create_num == NULL)
+        printf("Test on invalid lenght of array: SUCCESS!\n");
+
+    else 
+    {
+        printf("Test on invalid lenght of array: FAILED! Expected: NULL, Was: %p\n", create_num);
+        free(create_num);
+    }
+    
+    unsigned int duplicate = getDuplicate(null_array, len2);
+
+    if (duplicate == 0)
+        printf("Test on invalid array: SUCESS!\n");
+
+    else 
+        printf("Test on invalid array: FAILED! Expected: 0, WAS: %u\n", duplicate);
+
+    unsigned int duplicate2 = getDuplicate(array_ptr, len1);
+
+    if (duplicate2 == 0)
+        printf("Test on invalid lenght of array: SUCESS!\n");
+    
+    else 
+        printf("Test on invalid lenght of array: FAILED, Expected: 0, WAS: %u\n", duplicate2);
+}
+
+void test_array(void)
+{
+    unsigned int len = 10;
+    unsigned int *array = NULL;
+    
+    array = createNumbers(len);
+
+    if (array == NULL)
+        printf("Test on valid lenght of array: FAILED! Expected array greater than 0, Was: NULL\n");
+
+    else printf("Test on valid lenght of array: SUCESS!\n");
+
+    unsigned int test_array_dup[] = {1, 2, 3, 4, 5, 2, 6, 7, 8, 9};
+    unsigned int test_len = 10;
+    unsigned int duplicate = 2;
+
+    unsigned int duplicate_found = getDuplicate(test_array_dup, test_len);
+    
+    if (duplicate_found != duplicate)
+        printf("Test on valid lenght of array: FAILED! Expected %u, Was: %u\n", duplicate, duplicate_found);
+
+    else printf("Test on valid lenght of array: SUCESS!, Duplicate value: %d\n", duplicate);
+
+    free(array);
+}
+
+int main(void)
+{
+    test_empty_function();
+    printf("\n");
+    test_array();
+    return EXIT_SUCCESS;
+}