[fish] Workaround for failing test

shell/key-bindings.fish

@@ -15,6 +15,7 @@
 # Key bindings
 # ------------
 function fzf_key_bindings
+  test -t 0; or set -gx STDIN_NOT_TTY 1
 
   function __fzf_defaults
     # $1: Prepend to FZF_DEFAULT_OPTS_FILE and FZF_DEFAULT_OPTS
@@ -93,8 +94,13 @@ function fzf_key_bindings
             'string join0 -- $i\t(string replace -a -- \n \n\t $h[$i] | string collect);' \
             'end'
         end
-        eval (__fzfcmd) --read0 --print0 -q '(commandline)' --bind='enter:become:"string replace -a -- \n\t \n {2..} | string collect"' | read -lz result
-        and commandline -- $result
+        if test "$STDIN_NOT_TTY" = 1
+          eval $FZF_DEFAULT_COMMAND | eval (__fzfcmd) --read0 --print0 -q '(commandline)' --bind='enter:become:"string replace -a -- \n\t \n {2..} | string collect"' | read -lz result
+          and commandline -- $result
+        else
+          eval (__fzfcmd) --read0 --print0 -q '(commandline)' --bind='enter:become:"string replace -a -- \n\t \n {2..} | string collect"' | read -lz result
+          and commandline -- $result
+        end
       else
         builtin history | eval (__fzfcmd) -q '(commandline)' | read -l result
         and commandline -- $result