diff --git a/numbers.c b/numbers.c
index f59d9a2..f615fcb 100644
--- a/numbers.c
+++ b/numbers.c
@@ -5,11 +5,13 @@
 #include "numbers.h"
 #include "bintree.h"
 
-//TODO: getDuplicate und createNumbers implementieren
+unsigned int RANDOM_SEED = 0;
+
+// TODO: getDuplicate und createNumbers implementieren
 /*  *   * Erzeugen eines Arrays mit der vom Nutzer eingegebenen Anzahl an Zufallszahlen.
-  * Sicherstellen, dass beim Befüllen keine Duplikate entstehen.
-  * Duplizieren eines zufälligen Eintrags im Array.
-  * in `getDuplicate()`: Sortieren des Arrays und Erkennen der doppelten Zahl durch Vergleich benachbarter Elemente. */
+ * Sicherstellen, dass beim Befüllen keine Duplikate entstehen.
+ * Duplizieren eines zufälligen Eintrags im Array.
+ * in `getDuplicate()`: Sortieren des Arrays und Erkennen der doppelten Zahl durch Vergleich benachbarter Elemente. */
 
 // Returns len random numbers between 1 and 2x len in random order which are all different, except for two entries.
 // Returns NULL on errors. Use your implementation of the binary search tree to check for possible duplicates while
@@ -17,10 +19,19 @@
 unsigned int *createNumbers(unsigned int len)
 {
 
+  unsigned int *numbers = malloc(sizeof(unsigned int) * len);
+
+  if (RANDOM_SEED == 0)
+  {
+    srand(time(NULL));
+  }
+  else
+  {
+    srand(12345);
+  }
 }
 
 // Returns only the only number in numbers which is present twice. Returns zero on errors.
 unsigned int getDuplicate(const unsigned int numbers[], unsigned int len)
 {
-
-}
\ No newline at end of file
+}
diff --git a/numbers.h b/numbers.h
index 2315581..845bedb 100644
--- a/numbers.h
+++ b/numbers.h
@@ -1,10 +1,14 @@
 #ifndef NUMBERS_H
 #define NUMBERS_H
 
+extern unsigned int RANDOM_SEED;
+
 // Returns len random numbers between 1 and 2x len in random order which are all different, except for two entries.
 // Returns NULL on errors. Use your implementation of the binary search tree to check for possible duplicates while
 // creating random numbers.
+
 unsigned int *createNumbers(unsigned int len);
+//funktion mit srand(time)
 
 // Returns only the only number in numbers which is present twice. Returns zero on errors.
 unsigned int getDuplicate(const unsigned int *numbers, unsigned int len);
diff --git a/test__numbers.c b/test__numbers.c
new file mode 100644
index 0000000..bc3e2ad
--- /dev/null
+++ b/test__numbers.c
@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include "numbers.h"
+
+void test_enough_numbers() {
+    unsigned int len = 20;
+    unsigned int *numbers = createNumbers(len);
+
+    if(*numbers == NULL)
+    {
+        return;
+    }
+}
+
+
+void test_no_duplicates_except_one() {
+
+}
+
+void test_is_duplicated() {
+
+}
+
+int main(void) {
+    UNITY_BEGIN();
+
+    RUN_TEST(test_enough_numbers);
+    RUN_TEST(test_is_duplicated);
+    RUN_TEST(test_no_duplicates_except_one);
+
+    int result = UNITY_END();
+    print_test_result(result);
+
+    return result;
+}
+