diff --git a/performance_tests.sh b/performance_tests.sh
index 1f100dc..408e533 100755
--- a/performance_tests.sh
+++ b/performance_tests.sh
@@ -2,7 +2,7 @@
 
 .   driglibash-base
 #prerequisite: creation_repo.sh has been run
-
+files_to_keep='sample0'
 Help()
 {
    echo "
@@ -27,7 +27,7 @@ test0(){
     bw0=$(grep -e "Receiving objects:" cloning_text| grep -o "[[:digit:].]* MiB " | tail -n1)
     echo "memory usage in a classic cloning : $mem0"
     echo "bandwidth usage : $bw0"    
-    #run rm -rf performance_testing
+    run rm -rf performance_testing
 }
 
 test1(){
@@ -39,7 +39,7 @@ test1(){
     echo "memory usage in a --single-branch cloning : $mem1"
     echo "bandwidth usage : $bw1"
     run 
-    #rm -rf performance_testing
+    rm -rf performance_testing
 }
 
 test2(){
@@ -66,6 +66,26 @@ test3(){
     rm -rf performance_testing
 }
 
+test4(){
+    section TEST4
+    run echo 'TEST 4 : case of sparse-checking only some files with depth=1'
+    run mkdir performance_testing  #to do : isoler le nom de l'URL
+    run cd performance_testing
+    run git init -q
+    run git config core.sparsecheckout true 
+    run echo $files_to_keep >> .git/info/sparse-checkout 
+    run git remote add -f origin $1 &> cloning_text #to do : find a way to do this quietly/why isn't it writing in cloning_text?
+    echo 'juste avant le pull'
+    run git pull --progress origin main 2> cloning_text #to do : adapter au cas où ce soit master et pas main
+    mem4=$(du . | tail -n1 | tr -cd [:digit:])
+    bw4=$(grep -e "Receiving objects:" cloning_text| grep -o "[[:digit:].]* MiB " | tail -n1)
+    echo "memory usage in a --depth=1 with sparse checking only $files_to_keep : $mem4"
+    echo "bandwidth usage : $bw4"
+    cd ..
+    run rm -rf performance_testing
+}
+#est-ce que ça fait depth=1 ?
+
 while getopts ":hn:a" option; do
    case $option in
       h) # display Help
@@ -95,6 +115,7 @@ if [ "$ALL_TESTS" = true ]; then
     test1 $REPO_LINK
     test2 $REPO_LINK
     test3 $REPO_LINK
+    test4 $REPO_LINK
 
 elif [ -n "$TEST_NUM" ]; then
     case $TEST_NUM in
@@ -106,6 +127,8 @@ elif [ -n "$TEST_NUM" ]; then
             test2 $REPO_LINK;;
         3) 
             test3 $REPO_LINK;;
+        4) 
+            test4 $REPO_LINK;;
         *)
             echo "Error: Invalid test number"
             die;;