diff --git a/neuralNetworkTests.c b/neuralNetworkTests.c
index 35890ca..6489a55 100644
--- a/neuralNetworkTests.c
+++ b/neuralNetworkTests.c
@@ -4,20 +4,26 @@
 #include <math.h>
 #include "unity.h"
 #include "neuralNetwork.h"
+#include "neuralNetwork.c"
 //Dateischichten sind in neuralNetwork.h definiert
+// Dateiname: __info2_neural_network_file_format__
 
 static void prepareNeuralNetworkFile(const char *path, const NeuralNetwork nn)
 {
     // Datei oeffnen
-    FILE *fopen(const char *NeuralNetwork, const char *r);
+    FILE *file = fopen(path, "wb");
 
-    if (__info2_neural_network_file_format__ == NULL) return 1;
 
-    // Dateiname: __info2_neural_network_file_format__
+    if (file == NULL) 
+        return 1;
+
+    // header schreiben
+    fwrite(FILE_HEADER_STRING, sizeof(char), strlen(FILE_HEADER_STRING), file);
+
     
 
     // Datei wieder schließen!
-    int fclose(FILE *path);
+    fclose(file);
 }
 
 void test_loadModelReturnsCorrectNumberOfLayers(void)