diff --git a/neuralNetworkTests.c b/neuralNetworkTests.c
index 21ab370..e1fee55 100644
--- a/neuralNetworkTests.c
+++ b/neuralNetworkTests.c
@@ -8,7 +8,28 @@
 
 static void prepareNeuralNetworkFile(const char *path, const NeuralNetwork nn)
 {
-    // TODO
+    FILE *file = fopen(path, "wb");
+    if (!file){
+         printf("Fehler Dateierzeugung"); 
+         return;
+    }
+
+    char *file_header = "__info2_neural_network_file_format__";
+
+    fwrite(file_header, sizeof(char), strlen(file_header), file);                                                   //Header schreiben
+    
+    for(int i=0;i<sizeof(nn.numberOfLayers);i++){                                                                           //Jede Layer durchgehen
+        fwrite(&nn.layers[i].weights.cols,sizeof(unsigned int),1,file);                                             //Reihen
+        fwrite(&nn.layers[i].weights.rows,sizeof(unsigned int),1,file);                                             //Zeilen
+        
+        fwrite(nn.layers[i].weights.buffer,sizeof(MatrixType),sizeof(nn.layers[i].weights.buffer),file);            //Inhalt
+
+        fwrite(nn.layers[i].biases.buffer,sizeof(MatrixType),sizeof(nn.layers[i].biases.buffer),file);
+        
+    }
+    
+    printf("Test\n");
+    fclose(file);
 }
 
 void test_loadModelReturnsCorrectNumberOfLayers(void)
@@ -26,9 +47,11 @@ void test_loadModelReturnsCorrectNumberOfLayers(void)
 
     NeuralNetwork expectedNet = {.layers=layers, .numberOfLayers=2};
     NeuralNetwork netUnderTest;
-
+    
+    printf("Test\n");
     prepareNeuralNetworkFile(path, expectedNet);
-
+    
+    printf("Test\n");
     netUnderTest = loadModel(path);
     remove(path);
 
@@ -237,6 +260,5 @@ int main()
     RUN_TEST(test_loadModelFailsOnWrongFileTag);
     RUN_TEST(test_clearModelSetsMembersToNull);
     RUN_TEST(test_predictReturnsCorrectLabels);
-
     return UNITY_END();
 }
\ No newline at end of file
diff --git a/some__nn_test_file.info2 b/some__nn_test_file.info2
new file mode 100644
index 0000000..e69de29