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diff --git a/old_C_code/stage1/test/MPI_Communication/t.pack.c b/old_C_code/stage1/test/MPI_Communication/t.pack.c
new file mode 100644
index 0000000..6692af5
--- /dev/null
+++ b/old_C_code/stage1/test/MPI_Communication/t.pack.c
@@ -0,0 +1,106 @@
+#include "lut.h"
+#include <stdlib.h>
+#include "MPI_Communication/pack.h"
+#include "Util/types.h"
+#include <stdint.h>
+#include "Util/utils.h"
+
+// Work_t
+void t_pack1()
+{
+	Work_t* work = (Work_t*)malloc(sizeof(Work_t));
+	work->inputFileName = "../tdata/inputTest.bin";
+	work->nbSeries = 5;
+	uint32_t ranks[] =
+	{
+		0, 
+		12*65536 + 3*256+11,
+		32*16777216 + 2*65536 + 17*256 + 42, 
+		123,
+		51*16777216 + 77*65536 + 0*256 + 10
+	};
+	work->ranks = ranks;
+	work->nbClusters = 15;
+	work->clustOnMedoids = 0;
+	work->p_for_dissims = 1;
+	
+	// Hard-coded expected packed work
+	unsigned char expectedPackedWork[] =
+	{
+		// --> ../tdata/inputTest.bin
+		46,46,47,100,97,116,97,47,105,110,112,117,116,84,101,115,116,46,98,105,110,
+		// continue with 256 - strlen("../tdata/inputTest.bin") zeros...
+		0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+		0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+		0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+		0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+		0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+		0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+		0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+		0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+		0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+		0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+		0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+		0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+		// --> 5, {ranks}+0,0, 15, 0 on 4-bytes integers little-endian
+		5,0,0,0, 0,0,0,0, 11,3,12,0, 42,17,2,32, 123,0,0,0, 10,0,77,51, 0,0,0,0, 0,0,0,0, 
+		15,0,0,0, 0,0,0,0, 1,0,0,0
+	};
+	
+	uint32_t nbSeriesInChunk = 7;
+	uint32_t work_message_length = get_packedWork_length(nbSeriesInChunk);
+	unsigned char packedWork[work_message_length];
+	pack_work(work, nbSeriesInChunk, packedWork);
+	
+	for (uint32_t i=0; i<work_message_length; i++)
+	{
+		LUT_ASSERT(packedWork[i] == expectedPackedWork[i]);
+	}
+	
+	free(work);
+}
+
+// Result_t
+void t_pack2() {
+	
+	Result_t* result = (Result_t*)malloc(sizeof(Result_t));
+	uint32_t nbClusters = result->nbClusters = 5;
+	uint32_t medoids_ID[] =
+	{
+		15*65536 + 13*256+11,
+		11, 
+		17*16777216 + 0*65536 + 14*256 + 42, 
+		123*65536 + 0*256 + 7,
+		51*16777216 + 0*65536 + 0*256 + 10
+	};
+	result->medoids_ID = medoids_ID;
+	uint32_t medoids_ranks[] =
+	{
+		5*65536 + 32,
+		11*256 + 4, 
+		23*16777216 + 42, 
+		35*65536 + 5*256 + 77,
+		1*16777216 + 1*65536 + 1*256 + 10
+	};
+	result->medoids_ranks = medoids_ranks;
+	
+	// Hard-coded expected result
+	unsigned char expectedPackedResult[] =
+	{
+		// 5, {medoids_ID}, {medoids_ranks}
+		5,0,0,0,
+		11,13,15,0, 11,0,0,0, 42,14,0,17, 7,0,123,0, 10,0,0,51,
+		32,0,5,0, 4,11,0,0, 42,0,0,23, 77,5,35,0, 10,1,1,1
+	};
+	
+	uint32_t result_message_length = get_packedResult_length(nbClusters);
+	unsigned char packedResult[result_message_length];
+	pack_result(result, packedResult);
+	
+	for (uint32_t i=0; i<result_message_length; i++)
+	{
+		LUT_ASSERT(packedResult[i] == expectedPackedResult[i]);
+	}
+	
+	free(result);
+}