Fix in and not_in assertion methods in ZSH<5.3

zunit

@@ -118,13 +118,18 @@ function _zunit_assert_in() {
   local -a array
   array=(${(@)@:2})
 
+  local oldIFS=$IFS
+  IFS=$'\n'
+
   for i in ${(@f)array}; do
     [[ $i = $value ]] && found=1
   done
 
+
   [[ $found -eq 1 ]] && return 0
 
   echo "'$value' is not in (${(@f)array})"
+  IFS=$oldIFS
   exit 1
 }
 
@@ -136,13 +141,17 @@ function _zunit_assert_not_in() {
   local -a array
   array=(${(@)@:2})
 
+  local oldIFS=$IFS
+  IFS=$'\n'
+
   for i in ${(@f)array}; do
     [[ $i = $value ]] && found=1
   done
 
   [[ $found -eq 0 ]] && return 0
 
   echo "'$value' is in (${(@f)array})"
+  IFS=$oldIFS
   exit 1
 }