diff --git a/d01/ex04/unitests/file_does_not_exist.replace b/d01/ex04/unitests/file_does_not_exist.replace
new file mode 100644
index 0000000..e69de29
diff --git a/d01/ex04/unitests/test.sh b/d01/ex04/unitests/test.sh
index b014a20..6626ecc 100644
--- a/d01/ex04/unitests/test.sh
+++ b/d01/ex04/unitests/test.sh
@@ -14,8 +14,8 @@ fi
 # RUN TESTS
 	function run_tests
 	{
-		touch $TESTNAME
-		echo "$CONTENT" > $TESTNAME
+		if [ -f $TESTNAME ];then
+			echo "$CONTENT" > $TESTNAME;fi
 
 		$LEAKS ../$EXECUTABLE $TESTNAME "$FIND" "$REPLACEMENT"
 		OUTPUT=$( cat $TESTNAME.replace )
@@ -26,11 +26,13 @@ fi
 			echo -e $B_RED"$TESTNAME faillure"$ENDCO
 		fi
 
-		mv $TESTNAME $TESTNAME.replace ./test_log
+		if [ -f $TESTNAME ];then
+			mv $TESTNAME $TESTNAME.replace ./test_log;fi
 	}
 
 # TEST 1 ########################################
-TESTNAME="test1"
+TESTNAME="one_line_file"
+touch $TESTNAME
 FIND=" "
 REPLACEMENT="hello"
 CONTENT=" "
@@ -38,7 +40,8 @@ RESULT="hello"
 run_tests
 
 # TEST 2 ########################################
-TESTNAME="test2"
+TESTNAME="multi_line_file"
+touch $TESTNAME
 FIND="ie"
 REPLACEMENT="++"
 CONTENT=$(cat << EOF
@@ -60,7 +63,8 @@ EOF
 run_tests
 
 # TEST 3 ########################################
-TESTNAME="test3"
+TESTNAME="replace_one_character"
+touch $TESTNAME
 FIND="."
 REPLACEMENT="+"
 CONTENT=$(cat << EOF
@@ -74,7 +78,8 @@ EOF
 run_tests
 
 # TEST 4 ########################################
-TESTNAME="test4"
+TESTNAME="replace_two_characters"
+touch $TESTNAME
 FIND=".."
 REPLACEMENT="++"
 CONTENT=$(cat << EOF
@@ -90,7 +95,8 @@ EOF
 run_tests
 
 # TEST 5 ########################################
-TESTNAME="test5"
+TESTNAME="first_letter_lure"
+touch $TESTNAME
 FIND="mdr"
 REPLACEMENT="|||"
 CONTENT=$(cat << EOF
@@ -104,7 +110,8 @@ EOF
 run_tests
 
 # TEST 6 ########################################
-TESTNAME="test6"
+TESTNAME="half_replacement_lure"
+touch $TESTNAME
 FIND="toutouille"
 REPLACEMENT="||||||||||"
 CONTENT=$(cat << EOF
@@ -120,7 +127,8 @@ EOF
 run_tests
 
 # TEST 7 ########################################
-TESTNAME="test7"
+TESTNAME="special_character_'"
+touch $TESTNAME
 FIND="n't"
 REPLACEMENT="000"
 CONTENT=$(cat << EOF
@@ -186,7 +194,8 @@ EOF
 run_tests
 
 # TEST 8 ########################################
-TESTNAME="test8"
+TESTNAME="multiline_replacement"
+touch $TESTNAME
 FIND=$(cat << EOF
 ry
 I don't 
@@ -214,7 +223,8 @@ EOF
 run_tests
 
 # TEST 9 ########################################
-TESTNAME="test9"
+TESTNAME="empty_find"
+touch $TESTNAME
 FIND=""
 REPLACEMENT="p"
 CONTENT=$(cat << EOF
@@ -234,7 +244,8 @@ EOF
 run_tests
 
 # TEST 10 ########################################
-TESTNAME="test10"
+TESTNAME="empty_find_and_replacement"
+touch $TESTNAME
 FIND=""
 REPLACEMENT=""
 CONTENT=$(cat << EOF
@@ -253,3 +264,37 @@ EOF
 )
 run_tests
 
+# TEST 11 ########################################
+TESTNAME="empty_replacement"
+touch $TESTNAME
+FIND="a"
+REPLACEMENT=""
+CONTENT=$(cat << EOF
+No more tears, my heart is dry
+I don't laugh and I don't cry
+I don't think about you all the time
+But when I do - I wonder why
+EOF
+)
+RESULT=$(cat << EOF
+No more ters, my hert is dry
+I don't lugh nd I don't cry
+I don't think bout you ll the time
+But when I do - I wonder why
+EOF
+)
+run_tests
+
+# TEST 12 ########################################
+TESTNAME="file_does_not_exist"
+FIND="o"
+REPLACEMENT="O"
+CONTENT=$(cat << EOF
+No more tears, my heart is dry
+I don't laugh and I don't cry
+I don't think about you all the time
+But when I do - I wonder why
+EOF
+)
+RESULT=""
+run_tests
diff --git a/d01/ex04/unitests/test13.replace b/d01/ex04/unitests/test13.replace
new file mode 100644
index 0000000..e69de29
diff --git a/d01/ex04/unitests/test_log/empty_find b/d01/ex04/unitests/test_log/empty_find
new file mode 100644
index 0000000..652b428
--- /dev/null
+++ b/d01/ex04/unitests/test_log/empty_find
@@ -0,0 +1,4 @@
+No more tears, my heart is dry
+I don't laugh and I don't cry
+I don't think about you all the time
+But when I do - I wonder why
diff --git a/d01/ex04/unitests/test_log/empty_find.replace b/d01/ex04/unitests/test_log/empty_find.replace
new file mode 100644
index 0000000..652b428
--- /dev/null
+++ b/d01/ex04/unitests/test_log/empty_find.replace
@@ -0,0 +1,4 @@
+No more tears, my heart is dry
+I don't laugh and I don't cry
+I don't think about you all the time
+But when I do - I wonder why
diff --git a/d01/ex04/unitests/test_log/empty_find_and_replacement b/d01/ex04/unitests/test_log/empty_find_and_replacement
new file mode 100644
index 0000000..652b428
--- /dev/null
+++ b/d01/ex04/unitests/test_log/empty_find_and_replacement
@@ -0,0 +1,4 @@
+No more tears, my heart is dry
+I don't laugh and I don't cry
+I don't think about you all the time
+But when I do - I wonder why
diff --git a/d01/ex04/unitests/test_log/empty_find_and_replacement.replace b/d01/ex04/unitests/test_log/empty_find_and_replacement.replace
new file mode 100644
index 0000000..652b428
--- /dev/null
+++ b/d01/ex04/unitests/test_log/empty_find_and_replacement.replace
@@ -0,0 +1,4 @@
+No more tears, my heart is dry
+I don't laugh and I don't cry
+I don't think about you all the time
+But when I do - I wonder why
diff --git a/d01/ex04/unitests/test_log/empty_replacement b/d01/ex04/unitests/test_log/empty_replacement
new file mode 100644
index 0000000..652b428
--- /dev/null
+++ b/d01/ex04/unitests/test_log/empty_replacement
@@ -0,0 +1,4 @@
+No more tears, my heart is dry
+I don't laugh and I don't cry
+I don't think about you all the time
+But when I do - I wonder why
diff --git a/d01/ex04/unitests/test_log/empty_replacement.replace b/d01/ex04/unitests/test_log/empty_replacement.replace
new file mode 100644
index 0000000..c6854d9
--- /dev/null
+++ b/d01/ex04/unitests/test_log/empty_replacement.replace
@@ -0,0 +1,4 @@
+No more ters, my hert is dry
+I don't lugh nd I don't cry
+I don't think bout you ll the time
+But when I do - I wonder why
diff --git a/d01/ex04/unitests/test_log/first_letter_lure b/d01/ex04/unitests/test_log/first_letter_lure
new file mode 100644
index 0000000..671f5ed
--- /dev/null
+++ b/d01/ex04/unitests/test_log/first_letter_lure
@@ -0,0 +1 @@
+test de mmdr foubar
diff --git a/d01/ex04/unitests/test_log/first_letter_lure.replace b/d01/ex04/unitests/test_log/first_letter_lure.replace
new file mode 100644
index 0000000..991bdd3
--- /dev/null
+++ b/d01/ex04/unitests/test_log/first_letter_lure.replace
@@ -0,0 +1 @@
+test de m||| foubar
diff --git a/d01/ex04/unitests/test_log/half_replacement_lure b/d01/ex04/unitests/test_log/half_replacement_lure
new file mode 100644
index 0000000..a74f1c0
--- /dev/null
+++ b/d01/ex04/unitests/test_log/half_replacement_lure
@@ -0,0 +1,2 @@
+trouve ce mot toutouille
+et celui-la toutoutouille
diff --git a/d01/ex04/unitests/test_log/half_replacement_lure.replace b/d01/ex04/unitests/test_log/half_replacement_lure.replace
new file mode 100644
index 0000000..8072725
--- /dev/null
+++ b/d01/ex04/unitests/test_log/half_replacement_lure.replace
@@ -0,0 +1,2 @@
+trouve ce mot ||||||||||
+et celui-la tou||||||||||
\ No newline at end of file
diff --git a/d01/ex04/unitests/test_log/multi_line_file b/d01/ex04/unitests/test_log/multi_line_file
new file mode 100644
index 0000000..23b0c96
--- /dev/null
+++ b/d01/ex04/unitests/test_log/multi_line_file
@@ -0,0 +1,5 @@
+ce fichier
+contient
+plusieurs lignes
+les unes au dessus des autres
+youhouuu ioieux
diff --git a/d01/ex04/unitests/test_log/multi_line_file.replace b/d01/ex04/unitests/test_log/multi_line_file.replace
new file mode 100644
index 0000000..a573c23
--- /dev/null
+++ b/d01/ex04/unitests/test_log/multi_line_file.replace
@@ -0,0 +1,5 @@
+ce fich++r
+cont++nt
+plus++urs lignes
+les unes au dessus des autres
+youhouuu io++ux
diff --git a/d01/ex04/unitests/test_log/multiline_replacement b/d01/ex04/unitests/test_log/multiline_replacement
new file mode 100644
index 0000000..652b428
--- /dev/null
+++ b/d01/ex04/unitests/test_log/multiline_replacement
@@ -0,0 +1,4 @@
+No more tears, my heart is dry
+I don't laugh and I don't cry
+I don't think about you all the time
+But when I do - I wonder why
diff --git a/d01/ex04/unitests/test_log/multiline_replacement.replace b/d01/ex04/unitests/test_log/multiline_replacement.replace
new file mode 100644
index 0000000..3a2e850
--- /dev/null
+++ b/d01/ex04/unitests/test_log/multiline_replacement.replace
@@ -0,0 +1,4 @@
+No more tears, my heart is doo
+oooooooolaugh and I don't coo
+oooooooothink about you all the time
+But when I do - I wonder why
diff --git a/d01/ex04/unitests/test_log/one_line_file b/d01/ex04/unitests/test_log/one_line_file
new file mode 100644
index 0000000..8d1c8b6
--- /dev/null
+++ b/d01/ex04/unitests/test_log/one_line_file
@@ -0,0 +1 @@
+ 
diff --git a/d01/ex04/unitests/test_log/one_line_file.replace b/d01/ex04/unitests/test_log/one_line_file.replace
new file mode 100644
index 0000000..b6fc4c6
--- /dev/null
+++ b/d01/ex04/unitests/test_log/one_line_file.replace
@@ -0,0 +1 @@
+hello
\ No newline at end of file
diff --git a/d01/ex04/unitests/test_log/replace_one_character b/d01/ex04/unitests/test_log/replace_one_character
new file mode 100644
index 0000000..922f88c
--- /dev/null
+++ b/d01/ex04/unitests/test_log/replace_one_character
@@ -0,0 +1 @@
+....................................................;
diff --git a/d01/ex04/unitests/test_log/replace_one_character.replace b/d01/ex04/unitests/test_log/replace_one_character.replace
new file mode 100644
index 0000000..d3b95af
--- /dev/null
+++ b/d01/ex04/unitests/test_log/replace_one_character.replace
@@ -0,0 +1 @@
+++++++++++++++++++++++++++++++++++++++++++++++++++++;
diff --git a/d01/ex04/unitests/test_log/replace_two_characters b/d01/ex04/unitests/test_log/replace_two_characters
new file mode 100644
index 0000000..0880dee
--- /dev/null
+++ b/d01/ex04/unitests/test_log/replace_two_characters
@@ -0,0 +1,2 @@
+...................................................;
+. . . . . . . . . . . . . . . . . . . . . . . . . .;
diff --git a/d01/ex04/unitests/test_log/replace_two_characters.replace b/d01/ex04/unitests/test_log/replace_two_characters.replace
new file mode 100644
index 0000000..80f497e
--- /dev/null
+++ b/d01/ex04/unitests/test_log/replace_two_characters.replace
@@ -0,0 +1,2 @@
+++++++++++++++++++++++++++++++++++++++++++++++++++.;
+. . . . . . . . . . . . . . . . . . . . . . . . . .;
diff --git a/d01/ex04/unitests/test_log/special_character_' b/d01/ex04/unitests/test_log/special_character_'
new file mode 100644
index 0000000..05ee8e4
--- /dev/null
+++ b/d01/ex04/unitests/test_log/special_character_'
@@ -0,0 +1,27 @@
+No more tears, my heart is dry
+I don't laugh and I don't cry
+I don't think about you all the time
+But when I do - I wonder why
+
+You have to go out of my door
+And leave just like you did before
+I know I said that I was sure
+But rich men can't imagine poor.
+
+One day baby, we'll be old
+Oh baby, we'll be old
+And think of all the stories that we could have told
+
+Little me and little you
+Kept doing all the things they do
+They never really think it through
+Like I can never think you're true
+
+Here I go again - the blame
+The guilt, the pain, the hurt, the shame
+The founding fathers of our plane
+That's stuck in heavy clouds of rain.
+
+One day baby, we'll be old
+Oh baby, we'll be old
+And think of all the stories that we could have told
diff --git a/d01/ex04/unitests/test_log/special_character_'.replace b/d01/ex04/unitests/test_log/special_character_'.replace
new file mode 100644
index 0000000..7292451
--- /dev/null
+++ b/d01/ex04/unitests/test_log/special_character_'.replace
@@ -0,0 +1,27 @@
+No more tears, my heart is dry
+I do000 laugh and I do000 cry
+I do000 think about you all the time
+But when I do - I wonder why
+
+You have to go out of my door
+And leave just like you did before
+I know I said that I was sure
+But rich men ca000 imagine poor.
+
+One day baby, we'll be old
+Oh baby, we'll be old
+And think of all the stories that we could have told
+
+Little me and little you
+Kept doing all the things they do
+They never really think it through
+Like I can never think you're true
+
+Here I go again - the blame
+The guilt, the pain, the hurt, the shame
+The founding fathers of our plane
+That's stuck in heavy clouds of rain.
+
+One day baby, we'll be old
+Oh baby, we'll be old
+And think of all the stories that we could have told
diff --git a/d01/ex04/unitests/test_log/test10 b/d01/ex04/unitests/test_log/test10
new file mode 100644
index 0000000..652b428
--- /dev/null
+++ b/d01/ex04/unitests/test_log/test10
@@ -0,0 +1,4 @@
+No more tears, my heart is dry
+I don't laugh and I don't cry
+I don't think about you all the time
+But when I do - I wonder why
diff --git a/d01/ex04/unitests/test_log/test10.replace b/d01/ex04/unitests/test_log/test10.replace
new file mode 100644
index 0000000..652b428
--- /dev/null
+++ b/d01/ex04/unitests/test_log/test10.replace
@@ -0,0 +1,4 @@
+No more tears, my heart is dry
+I don't laugh and I don't cry
+I don't think about you all the time
+But when I do - I wonder why
diff --git a/d01/ex04/unitests/test_log/test11 b/d01/ex04/unitests/test_log/test11
new file mode 100644
index 0000000..652b428
--- /dev/null
+++ b/d01/ex04/unitests/test_log/test11
@@ -0,0 +1,4 @@
+No more tears, my heart is dry
+I don't laugh and I don't cry
+I don't think about you all the time
+But when I do - I wonder why
diff --git a/d01/ex04/unitests/test_log/test11.replace b/d01/ex04/unitests/test_log/test11.replace
new file mode 100644
index 0000000..c6854d9
--- /dev/null
+++ b/d01/ex04/unitests/test_log/test11.replace
@@ -0,0 +1,4 @@
+No more ters, my hert is dry
+I don't lugh nd I don't cry
+I don't think bout you ll the time
+But when I do - I wonder why
diff --git a/d01/ex04/unitests/test_log/test12 b/d01/ex04/unitests/test_log/test12
new file mode 100644
index 0000000..652b428
--- /dev/null
+++ b/d01/ex04/unitests/test_log/test12
@@ -0,0 +1,4 @@
+No more tears, my heart is dry
+I don't laugh and I don't cry
+I don't think about you all the time
+But when I do - I wonder why
diff --git a/d01/ex04/unitests/test_log/test12.replace b/d01/ex04/unitests/test_log/test12.replace
new file mode 100644
index 0000000..652b428
--- /dev/null
+++ b/d01/ex04/unitests/test_log/test12.replace
@@ -0,0 +1,4 @@
+No more tears, my heart is dry
+I don't laugh and I don't cry
+I don't think about you all the time
+But when I do - I wonder why
diff --git a/d01/ex04/unitests/test_log/test13 b/d01/ex04/unitests/test_log/test13
new file mode 100644
index 0000000..652b428
--- /dev/null
+++ b/d01/ex04/unitests/test_log/test13
@@ -0,0 +1,4 @@
+No more tears, my heart is dry
+I don't laugh and I don't cry
+I don't think about you all the time
+But when I do - I wonder why
diff --git a/d01/ex04/unitests/test_log/test13.replace b/d01/ex04/unitests/test_log/test13.replace
new file mode 100644
index 0000000..e69de29