Install test dependencies with develop flag

install.sh

@@ -439,6 +439,9 @@ joinmarket_install ()
     if [[ ${with_qt} == "1" ]]; then
         reqs='gui'
     fi
+    if [[ ${develop} == "1" ]]; then
+        reqs+=',test'
+    fi
 
     if [ "$with_jmvenv" == 1 ]; then pip_command=pip; else pip_command=pip3; fi
     $pip_command install -e ".[${reqs}]" || return 1
@@ -460,7 +463,9 @@ parse_flags ()
     while :; do
         case $1 in
             --develop)
-                # no-op for backwards compatibility
+                # editable install is currently always on
+                # option solely triggers test dependencies installation for now
+                develop='1'
                 ;;
             --disable-os-deps-check)
                 use_os_deps_check='0'