diff --git a/epitar/tests/functional/run.sh b/epitar/tests/functional/run.sh
index 37d5497..70b07f4 100644
--- a/epitar/tests/functional/run.sh
+++ b/epitar/tests/functional/run.sh
@@ -282,7 +282,23 @@ echo -e "\n$BBlue=== Help and Invalid Arguments ===$Color_Off"
 test_help "Help flag"
 test_invalid_args "No arguments" ""
 test_invalid_args "Invalid flag" "-z"
-test_invalid_args "Missing archive" "-c"
+test_invalid_args "Invalid flagS" "-zbk"
+test_invalid_args "Invalid position" "test.tar -h"
+test_invalid_args "Invalid flags and position" "test.tar -z"
+test_invalid_args "Invalid flags and position mix" "test.tar -zhx"
+test_invalid_args "Invalid position" "test.tar -z"
+test_invalid_args "Invalid flag mix" "-zh"
+test_invalid_args "Invalid flag mix 2" "-hnh"
+test_invalid_args "Invalid flag mix 3" "-cnc"
+test_invalid_args "Invalid flag mix 3" "-hhhz"
+test_invalid_args "Invalid flag mix 3" "-hnc"
+test_invalid_args "Invalid flag mix 3" "-cch"
+test_invalid_args "Invalid flag mix 3" "-cnc"
+test_invalid_args "Valid flags multiple" "-cc"
+test_invalid_args "Incompatible flag" "-cx"
+test_invalid_args "Missing op flag" "-v"
+test_invalid_args "Missing archive (c)" "-c"
+test_invalid_args "Missing archive (x)" "-x"
 test_invalid_args "Extract with files" "-x archive.tar file.txt"
 
 echo -e "\n$BBlue=== Edge Cases ===$Color_Off"