diff --git a/matrix.c b/matrix.c
index 4e9be5c..1062261 100644
--- a/matrix.c
+++ b/matrix.c
@@ -131,4 +131,14 @@ Matrix multiply(const Matrix matrix1, const Matrix matrix2)
             }
     }
     return result;
+}
+void writeMatrix(Matrix matrix, FILE *file)//Added for neuralNetworkTests
+{
+	for(int i = 0; i < matrix.rows; i++)
+	{
+		for(int j = 0; j < matrix.cols; j++)
+		{
+			fprintf(file, (char*)(matrix.buffer + (j+i)*sizeof(MatrixType)));
+		}
+	}
 }
\ No newline at end of file
diff --git a/matrix.h b/matrix.h
index 0771157..15b943e 100644
--- a/matrix.h
+++ b/matrix.h
@@ -21,6 +21,7 @@ void setMatrixAt(MatrixType value, Matrix matrix, unsigned int rowIdx, unsigned
 MatrixType getMatrixAt(const Matrix matrix, unsigned int rowIdx, unsigned int colIdx);
 Matrix add(const Matrix matrix1, const Matrix matrix2);
 Matrix multiply(const Matrix matrix1, const Matrix matrix2);
+void writeMatrix(Matrix matrix, FILE *file);//Added for neuralNetworkTests
 
 
 #endif
diff --git a/neuralNetworkTests.c b/neuralNetworkTests.c
index 21ab370..1647ab1 100644
--- a/neuralNetworkTests.c
+++ b/neuralNetworkTests.c
@@ -4,11 +4,20 @@
 #include <math.h>
 #include "unity.h"
 #include "neuralNetwork.h"
+#include "matrix.h"
 
 
 static void prepareNeuralNetworkFile(const char *path, const NeuralNetwork nn)
 {
-    // TODO
+	FILE *testDatei = fopen(path, "w");
+	fprintf(testDatei, "__info2_neural_network_file_format__");
+	for(int i = 0; i < nn.numberOfLayers; i++)
+	{
+		fprintf(testDatei, "\n");
+		writeMatrix(nn.layers[i].weights, testDatei);
+		writeMatrix(nn.layers[i].biases, testDatei);
+	}
+	fclose(testDatei);
 }
 
 void test_loadModelReturnsCorrectNumberOfLayers(void)